subject:(Neutron diffraction)

1. Wang, Xi. 3D Neutron Diffraction Studies on the Vortex Lattice.

Degree: PhD, Physics, 2012, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:297705/

► In condensed matter physics the vortex lattice of type-II superconductors provides a prototype for studying the effect of random pinning on elastic systems. One important… (more)

▼ In condensed matter physics the vortex lattice of type-II superconductors provides a prototype for studying the effect of random pinning on elastic systems. One important problem is to understand the structural transition from a theoretically predicted ordered Bragg glass phase to a disordered vortex liquid phase. Defects, such as screw dislocations, should play an important role in mediating this order-disorder transition. It is important to confirm the existence of these defect structures in the vortex lattice. Experimentally it is difficult to probe the detailed defect structures inside the vortex lattice. Traditional methods can only provide information on the surface configuration or an averaged picture of the bulk behavior of the vortex lattice. Here we use a novel high-resolution neutron diffraction technique to probe the angular orientation of the lattice planes as the flux lines traverse the atomic crystal. Our results provide structural evidence for screw dislocations inside the vortex lattice. The anisotropic defect structure in the underlying atomic lattice serves as a symmetry breaking field for the vortex lattice. The strong dependence of the vortex lattice structure on the growth procedure reveals that the system is metastable and can be perturbed through thermal cycling to a possible ground state. We measure the structure of the vortex lattice under different applied magnetic fields and temperatures to study the interplay between vortex-vortex interaction, vortex-atomic lattice interaction, and thermal fluctuations. This high-resolution neutron diffraction technique opens up a new way in studying the detailed structure of the vortex lattice. Our results suggest that the vortex lattice in low temperature superconductors with anisotropic defects in the atomic lattice could be an excellent candidate for exploring the entangled flux liquid phase. Advisors/Committee Members: Ling, Xinsheng (Director), Kosterlitz, J. (Reader), Mitrovic, Vesna (Reader).

Subjects/Keywords: neutron diffraction

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APA (6^th Edition):

Wang, X. (2012). 3D Neutron Diffraction Studies on the Vortex Lattice. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:297705/

Chicago Manual of Style (16^th Edition):

Wang, Xi. “3D Neutron Diffraction Studies on the Vortex Lattice.” 2012. Doctoral Dissertation, Brown University. Accessed January 24, 2021. https://repository.library.brown.edu/studio/item/bdr:297705/.

MLA Handbook (7^th Edition):

Wang, Xi. “3D Neutron Diffraction Studies on the Vortex Lattice.” 2012. Web. 24 Jan 2021.

Vancouver:

Wang X. 3D Neutron Diffraction Studies on the Vortex Lattice. [Internet] [Doctoral dissertation]. Brown University; 2012. [cited 2021 Jan 24]. Available from: https://repository.library.brown.edu/studio/item/bdr:297705/.

Council of Science Editors:

Wang X. 3D Neutron Diffraction Studies on the Vortex Lattice. [Doctoral Dissertation]. Brown University; 2012. Available from: https://repository.library.brown.edu/studio/item/bdr:297705/

University of New South Wales

2. White, Reyner. Magnetism and Properties of Three Rare Earth Intermetallic Series.

Degree: Physical, Environmental & Mathematical Sciences, 2018, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/59807 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:49839/SOURCE02?view=true

► Three intermetallic series with increasing rare earth dilution are examined and their magnetic and physical properties are determined. Of the first series, RNiAl₄, five materials… (more)

▼ Three intermetallic series with increasing rare earth dilution are examined and their magnetic and physical properties are determined. Of the first series, RNiAl₄, five materials are examined. For the TbNiAl₄ case, the incommensurate magnetic structure has been determined and then used to rationalise results from previous low temperature nuclear orientation (LTNO) studies. Similarly for NdNiAl₄, a model incommensurate structure has been used to simulate an LTNO experiment. For PrNiAl₄, the presence of an incommensurate magnetic phase has been confirmed and the magnetic structure determined. For ErNiAl₄, the magnetic structure has been charted from well below the ordering temperature to well above it. In DyNiAl₄, two magnetic structures have been identified: a higher temperature incommensurate phase and a lower temperature commensurate phase and these coexist in zero applied field, a first for the series. A reanalysis of existing TbNiAl₄ data has also identified similar phase coexistence. The collective results are used to examine trends across the series.Of the RM₂Al₁₀ series, TbRu₂Al₁₀ has been examined in depth. The material possesses two phase transitions as a function of temperature at TN = 15.0(3) K and TN' = 6.5(3) K and three more as a function of applied field at 2 K, at 1.30(3) T, 1.85(3) T and 3.20(3) T. These metamagnetic transitions transform the low temperature incommensurate square wave structure into two identifiably different 'pulse wave' structures and then to a para/ferromagnetic structure respectively. A magnetic phase diagram has been created and comparisons between TbRu₂Al₁₀ and other RM₂Al₁₀ compounds have been made as well as comparisons with the RNiAl₄ series.For the RM₂Al₂₀ series, three materials were analysed. For NdTi₂Al₂₀, a neutron diffraction experiment was performed at very low temperatures (70 mK) however no magnetic diffraction peaks were observed. DyTi₂Al₂₀ was subject to a similar experiment at 30 mK, where a commensurate antiferromagnetic structure was found. For TmV₂Al₂₀, inelastic neutron scattering was used to determine the crystal field parameters of the Tm³⁺ ion. Improvements were made to the original parameters obtained from bulk measurements, with W = 0.43(1) K and x = -0.63(1) using the Lea, Leask and Wolf formalism. Advisors/Committee Members: Hutchison, Wayne, Physical, Environmental & Mathematical Sciences, UNSW Canberra, UNSW, Cadogan, Sean, Physical, Environmental & Mathematical Sciences, UNSW Canberra, UNSW.

Subjects/Keywords: Neutron Diffraction; Magnetism; Intermetallics; Inelastic Neutron Scattering

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APA (6^th Edition):

White, R. (2018). Magnetism and Properties of Three Rare Earth Intermetallic Series. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/59807 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:49839/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

White, Reyner. “Magnetism and Properties of Three Rare Earth Intermetallic Series.” 2018. Doctoral Dissertation, University of New South Wales. Accessed January 24, 2021. http://handle.unsw.edu.au/1959.4/59807 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:49839/SOURCE02?view=true.

MLA Handbook (7^th Edition):

White, Reyner. “Magnetism and Properties of Three Rare Earth Intermetallic Series.” 2018. Web. 24 Jan 2021.

Vancouver:

White R. Magnetism and Properties of Three Rare Earth Intermetallic Series. [Internet] [Doctoral dissertation]. University of New South Wales; 2018. [cited 2021 Jan 24]. Available from: http://handle.unsw.edu.au/1959.4/59807 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:49839/SOURCE02?view=true.

Council of Science Editors:

White R. Magnetism and Properties of Three Rare Earth Intermetallic Series. [Doctoral Dissertation]. University of New South Wales; 2018. Available from: http://handle.unsw.edu.au/1959.4/59807 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:49839/SOURCE02?view=true

3. Ridley, Christopher James Taylor. Development of high pressure and cryogenic techniques, and their application to neutron diffraction.

Degree: PhD, 2017, University of Edinburgh

URL: http://hdl.handle.net/1842/28890

► Neutron diffraction is an extremely powerful technique in condensed matter research; it can be used to measure crystallographic structures, including some of those undeterminable using… (more)

▼ Neutron diffraction is an extremely powerful technique in condensed matter research; it can be used to measure crystallographic structures, including some of those undeterminable using X-rays. It is also perhaps the most powerful technique for determining magnetic structures, and for probing the strength of magnetic interactions, revealing information beyond that extractable from a magnetometer. High pressure is used by many condensed matter researchers as an additional thermodynamic variable, or tool to perturb otherwise stable systems, and has been used with neutron diffraction for many years. When coupled with low temperatures, this has led to the discovery of an enormous range of non-ambient phases of matter, with a range of exotic properties, some of which are discussed in this thesis. Pressure has a very strong effect on the magnetic properties of a material, with many of the most unusual magnetic phases existing only at extremely low temperatures, or pressures which can only be reached on very small samples. The main topic for this thesis is the study, development, and implementation of new techniques to combine low temperatures, high pressures, and neutron diffraction measurements from micro sized samples. A new pressure cell has been designed, tested, and commissioned with neutron beam time on the WISH diffractometer at the ISIS neutron facility. The cell is compact, with a total mass of approximately 5 kg, and is capable of generating large loads in excess of 4.5 tonnes force. Depending on the sample size used with the cell, the opposed anvil system is capable of generating a range of different pressures beyond what is widely available for low temperature neutron diffraction measurements. To save wasted experimental time in cooling and warming the device, the cell is capable of varying the applied load continuously down to 5 K, whilst the sample pressure can also be measured in-situ using a compact spectrometer system. Obtaining refineable neutron diffraction data from the small samples (< 1mm3) possible in an opposed anvil pressure cell is challenging due to extremely low ratios of signal-to-background when compared with large volume pressure cells. Finite element analysis (FEA) was performed to minimise the mass of the cell, whilst also minimising the amount of supporting material in the beam. Despite this, the signal from the sample is typically very weak; to overcome this, a novel 3D printed device has been designed and tested to collimate extremely small samples, removing much of the background signal from the surrounding material. It has enabled neutron data to be collected from samples an order of magnitude smaller than previously measurable in the cell. To maximise the pressures achievable in the pressure cell, for a given sample volume, an extended FEA study was performed to understand the evolutions of stresses in the cell, and understand the limitations of using sapphire as an anvil material. To complement this work, a compact piston cylinder cell has also been designed for a combination of…

Subjects/Keywords: high pressure; neutron diffraction; cryogenics

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APA (6^th Edition):

Ridley, C. J. T. (2017). Development of high pressure and cryogenic techniques, and their application to neutron diffraction. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/28890

Chicago Manual of Style (16^th Edition):

Ridley, Christopher James Taylor. “Development of high pressure and cryogenic techniques, and their application to neutron diffraction.” 2017. Doctoral Dissertation, University of Edinburgh. Accessed January 24, 2021. http://hdl.handle.net/1842/28890.

MLA Handbook (7^th Edition):

Ridley, Christopher James Taylor. “Development of high pressure and cryogenic techniques, and their application to neutron diffraction.” 2017. Web. 24 Jan 2021.

Vancouver:

Ridley CJT. Development of high pressure and cryogenic techniques, and their application to neutron diffraction. [Internet] [Doctoral dissertation]. University of Edinburgh; 2017. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1842/28890.

Council of Science Editors:

Ridley CJT. Development of high pressure and cryogenic techniques, and their application to neutron diffraction. [Doctoral Dissertation]. University of Edinburgh; 2017. Available from: http://hdl.handle.net/1842/28890

Queens University

4. Campbell, Dale. Lattice Strain Response of Zr-2 During Biaxial Deformation .

Degree: Mechanical and Materials Engineering, 2014, Queens University

URL: http://hdl.handle.net/1974/8549

► Pseudo-plane strain compression tests are carried out on rolled plate Zircaloy-2 using different combinations of loaded and constrained sample directions relative to the plate principal… (more)

Subjects/Keywords: Biaxial Deformation ; Zircaloy-2 ; Neutron Diffraction

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APA (6^th Edition):

Campbell, D. (2014). Lattice Strain Response of Zr-2 During Biaxial Deformation . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/8549

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Campbell, Dale. “Lattice Strain Response of Zr-2 During Biaxial Deformation .” 2014. Thesis, Queens University. Accessed January 24, 2021. http://hdl.handle.net/1974/8549.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Campbell, Dale. “Lattice Strain Response of Zr-2 During Biaxial Deformation .” 2014. Web. 24 Jan 2021.

Vancouver:

Campbell D. Lattice Strain Response of Zr-2 During Biaxial Deformation . [Internet] [Thesis]. Queens University; 2014. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1974/8549.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Campbell D. Lattice Strain Response of Zr-2 During Biaxial Deformation . [Thesis]. Queens University; 2014. Available from: http://hdl.handle.net/1974/8549

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Newcastle

5. Hayes, Robert. Structure in ionic liquids.

Degree: PhD, 2014, University of Newcastle

URL: http://hdl.handle.net/1959.13/1050983

►

Research Doctorate - Doctor of Philosophy (PhD)

Ionic Liquids (ILs) are a subset of molten salts distinguished by melting points below 373 K. ILs are… (more)

▼

Research Doctorate - Doctor of Philosophy (PhD)

Ionic Liquids (ILs) are a subset of molten salts distinguished by melting points below 373 K. ILs are unusual among solvents in that they are composed entirely of ions, with no neutral species present. Over the last decade or so, ILs have emerged as an attractive class of solvents for a range of chemical applications, mostly due to their ‘green’ characteristics and remarkable liquid properties. Understanding the ion arrangements in ILs is important as many of these applications and properties are related to their (bulk or interfacial) solvent structure. Historically, ILs were considered structurally homogeneous solutions of freely dissociated ions or ion pairs. Whilst these concepts are adequate for molten salt melts, IL ions can participate in a range of attractive interactions (van der Waals, π-π, hydrogen bonding, or solvophobic) in addition to Coulombic forces. Notably too, ion-ion interactions in ILs are tuneable, because changes in anion/cation size, shape or functional groups alter the balance of inter-ionic forces. These features suggest different solvent structures may be present in ILs compared to molecular solvents or molten salts. Further, many IL ions (usually the cation) are amphiphilic with both charged and uncharged groups. This means that there is potential for self-assembly in a fashion similar to aqueous surfactant dispersions, microemulsions or liquid crystals, but on much smaller length scales. Recent experimental and theoretical research has tested this hypothesis for aprotic ILs. The results show that aprotic ILs are heterogeneous on the nanoscale, forming polar and apolar domains in the bulk liquid due to clustering of charged and uncharged molecular groups. In this Thesis, the nature of protic IL structure in the bulk phase is examined using model fits to neutron diffraction data. It is shown that protic ILs are nanostructured solvents and that the solvent structure can be controllably varied. Secondly, aprotic IL structure at the Au(111) electrode interface are elucidated using atomic force microscopy. This provides fundamental insight to the IL electrical double layer structure that will underpin future IL-based electrochemical technologies.

Advisors/Committee Members: University of Newcastle. Faculty of Science & Information Technology, School of Environmental and Life Sciences.

Subjects/Keywords: ionic liquids; neutron diffraction; atomic force microscopy

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APA (6^th Edition):

Hayes, R. (2014). Structure in ionic liquids. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/1050983

Chicago Manual of Style (16^th Edition):

Hayes, Robert. “Structure in ionic liquids.” 2014. Doctoral Dissertation, University of Newcastle. Accessed January 24, 2021. http://hdl.handle.net/1959.13/1050983.

MLA Handbook (7^th Edition):

Hayes, Robert. “Structure in ionic liquids.” 2014. Web. 24 Jan 2021.

Vancouver:

Hayes R. Structure in ionic liquids. [Internet] [Doctoral dissertation]. University of Newcastle; 2014. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1959.13/1050983.

Council of Science Editors:

Hayes R. Structure in ionic liquids. [Doctoral Dissertation]. University of Newcastle; 2014. Available from: http://hdl.handle.net/1959.13/1050983

University of Bath

6. Jones, Andrew. Towards high throughput single crystal neutron diffraction of hydrogen bonded molecular complexes.

Degree: PhD, 2012, University of Bath

URL: https://researchportal.bath.ac.uk/en/studentthesis/towards-high-throughput-single-crystal-neutron-diffraction-of-hydrogen-bonded-molecular-complexes(85c99ee0-bd47-4ec8-92ee-e073ffe202c8).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.564000

► This work presents findings from experiments carried out using the neutron Laue method in tandem with laboratory source X-ray diffraction to characterise a series of… (more)

▼ This work presents findings from experiments carried out using the neutron Laue method in tandem with laboratory source X-ray diffraction to characterise a series of organic molecular complexes which exhibit interesting, and potentially “tunable”, temperature dependent charge transfer effects, such as proton migration and proton disorder within hydrogen bonded networks. These subtle processes are studied by variable temperature neutron diffraction studies, allowing the positional and anisotropic displacement parameters of the hydrogen atoms to be refined accurately and their evolution with temperature followed. The hydrogen atom behaviour is found to be influenced by the local environment, including weak intermolecular interactions in the vicinity of the hydrogen bond under study. Complexes of urea and methyl substituted ureas with small organic acids are presented, which show robust and reproducible structural motifs. In favourable circumstances, these contain short, strong hydrogen bonds (SSHBs) within which the proton may undergo temperature dependent migration. By synthesising a number of complexes containing SSHBs, potential routes to the design of proton migration complexes are found, which utilise crystal engineering principles and pKa matching. Variable temperature studies conducted on these complexes also show unusual thermal expansion properties and phase transitions in urea-acid complexes which do not display proton migration. Systems containing hydrogen bonded dimers of 3,5-dinitrobenzoic acid are also studied, and shown to contain temperature proton disorder within moderate strength hydrogen bonds linking the dimers. The presence and potential onset temperature of any disorder is found to be influenced by interactions around the acid dimers and potential routes to controlling proton disorder are discussed. Complexes of the proton sponge, 1,8-bis(dimethylamino)napthalene (DMAN), with organic acids are also presented, in which the structures have been determined using neutron diffraction. DMAN readily accepts a proton from the acid co-molecules used in forming the complexes, forming a strong intramolecular SSHB within the protonated DMAN. Strong intermolecular hydrogen bonds are also induced between the acid molecules in many cases. The neutron studies presented here investigate the effect of weak interactions on the behaviour of hydrogen atoms located within these SSHBs, and also indicate over what distance such interactions significantly affect the hydrogen atom behaviour.

Subjects/Keywords: 547; hydrogen bond; diffraction; x-ray; neutron

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APA (6^th Edition):

Jones, A. (2012). Towards high throughput single crystal neutron diffraction of hydrogen bonded molecular complexes. (Doctoral Dissertation). University of Bath. Retrieved from https://researchportal.bath.ac.uk/en/studentthesis/towards-high-throughput-single-crystal-neutron-diffraction-of-hydrogen-bonded-molecular-complexes(85c99ee0-bd47-4ec8-92ee-e073ffe202c8).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.564000

Chicago Manual of Style (16^th Edition):

Jones, Andrew. “Towards high throughput single crystal neutron diffraction of hydrogen bonded molecular complexes.” 2012. Doctoral Dissertation, University of Bath. Accessed January 24, 2021. https://researchportal.bath.ac.uk/en/studentthesis/towards-high-throughput-single-crystal-neutron-diffraction-of-hydrogen-bonded-molecular-complexes(85c99ee0-bd47-4ec8-92ee-e073ffe202c8).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.564000.

MLA Handbook (7^th Edition):

Jones, Andrew. “Towards high throughput single crystal neutron diffraction of hydrogen bonded molecular complexes.” 2012. Web. 24 Jan 2021.

Vancouver:

Jones A. Towards high throughput single crystal neutron diffraction of hydrogen bonded molecular complexes. [Internet] [Doctoral dissertation]. University of Bath; 2012. [cited 2021 Jan 24]. Available from: https://researchportal.bath.ac.uk/en/studentthesis/towards-high-throughput-single-crystal-neutron-diffraction-of-hydrogen-bonded-molecular-complexes(85c99ee0-bd47-4ec8-92ee-e073ffe202c8).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.564000.

Council of Science Editors:

Jones A. Towards high throughput single crystal neutron diffraction of hydrogen bonded molecular complexes. [Doctoral Dissertation]. University of Bath; 2012. Available from: https://researchportal.bath.ac.uk/en/studentthesis/towards-high-throughput-single-crystal-neutron-diffraction-of-hydrogen-bonded-molecular-complexes(85c99ee0-bd47-4ec8-92ee-e073ffe202c8).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.564000

7. Dráb Martin. Project:INDECS (Integrated Neutron Diffractometer Experiment Control System .

Degree: 2011, Czech University of Technology

URL: http://hdl.handle.net/10467/8038

Integrated Neutron Diffractometer Experiment Control System; Integrated Neutron Diffractometer Experiment Control System Advisors/Committee Members: Kalvoda Ladislav (advisor).

Subjects/Keywords: experiment control; neutron diffraction; data acqusition

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APA (6^th Edition):

Martin, D. (2011). Project:INDECS (Integrated Neutron Diffractometer Experiment Control System . (Thesis). Czech University of Technology. Retrieved from http://hdl.handle.net/10467/8038

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Martin, Dráb. “Project:INDECS (Integrated Neutron Diffractometer Experiment Control System .” 2011. Thesis, Czech University of Technology. Accessed January 24, 2021. http://hdl.handle.net/10467/8038.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Martin, Dráb. “Project:INDECS (Integrated Neutron Diffractometer Experiment Control System .” 2011. Web. 24 Jan 2021.

Vancouver:

Martin D. Project:INDECS (Integrated Neutron Diffractometer Experiment Control System . [Internet] [Thesis]. Czech University of Technology; 2011. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10467/8038.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Martin D. Project:INDECS (Integrated Neutron Diffractometer Experiment Control System . [Thesis]. Czech University of Technology; 2011. Available from: http://hdl.handle.net/10467/8038

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Edinburgh

8. Chen, Xiaochao. Mechanism of cellular uptake of HIV-TAT peptide & effects of TAT-SOD against ultraviolet induced skin damage.

Degree: PhD, 2013, University of Edinburgh

URL: http://hdl.handle.net/1842/10641

► TAT peptide is one of the best-characterised cell penetrating peptides (CPPs) derived from the transactivator of transcription protein from the human immunodeficiency virus 1 (HIV-1).… (more)

▼ TAT peptide is one of the best-characterised cell penetrating peptides (CPPs) derived from the transactivator of transcription protein from the human immunodeficiency virus 1 (HIV-1). TAT peptide is able to cross the cell membrane and deliver various biomolecules into cells with low immunogenicity and no toxicity. However, the exact mechanism of internalization still remains a subject of controversy. Lamellar neutron scattering was used to determine the location of TAT peptide in the negativelycharged phospholipids bilayers. The results reveal two locations, one in the peripheral aqueous phase between the adjacent bilayers and the second one below the glycerol backbone region of the lipid bilayer. A concentrationindependent membrane thinning above a peptide concentration threshold (1mol%) and a contiguous transbilayer water channel at the largest peptide concentration (10mol%) were also found. This evidence led to the suggestion that the toroidal pore model might be involved in the transmembrane mechanism at high peptide concentration. Another set of neutron diffraction experiments examined the interaction between the TAT peptide and neutral phospholipids showed that TAT peptide preferentially intercalated into the hydrophobic core and the glycerol backbone region of the neutral lipid bilayer at the lowest peptide concentration investigated (0.1mol%), indicating that the insertion did not require negatively-charged phospholipids. There was also clear evidence for the concentration-dependent reorientation of TAT peptide. A plasmid containing the human copper-zinc SOD gene linked with the coding sequence for a 11-aa HIV-TAT peptide (pGEX-TAT-SOD, 513bp) was constructed and used to express a recombinant fusion protein in Escherichia coli strain BL21 (DE3). High-level expression of TAT-SOD soluble protein with a GST tag (44-kDa) was achieved under optimal expression conditions and a small-scale glutathione affinity column or large-scale ion-exchange chromatography used for its purification. The potential protective effect of TAT-SOD against UV-induced cell damage was studied on UVC-irradiated MDCK epithelial cells. Before any further clinical study, the UV full-length absorption of TAT-SOD protein was measured. The results showed the potential UV protective effect of TAT-SOD was not due to the physical absorption of UV irradiation. In a preclinical study with five healthy volunteers, the penetration of TAT-SOD through human stratum corneum on the inner upper arm was identified by the tape stripping and specific SOD activity analysis. Significant increases on SOD activity were found on the outer layers of stratum corneum in TAT-SOD treated group, compared to placebo treated control, indicating that the TAT peptide assisted SOD to penetrate into the human stratum corneum . In a clinical study with ten healthy volunteers, eight showed a significant increase of minimal erythema dose (MED) with TAT-SOD pre-treatment. The median blood flow value of ten subjects at the UVB-irradiated site decreased with TAT-SOD pretreatment.…

Subjects/Keywords: 572; HIV-TAT; SOD; ultraviolet; neutron; diffraction

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APA (6^th Edition):

Chen, X. (2013). Mechanism of cellular uptake of HIV-TAT peptide & effects of TAT-SOD against ultraviolet induced skin damage. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/10641

Chicago Manual of Style (16^th Edition):

Chen, Xiaochao. “Mechanism of cellular uptake of HIV-TAT peptide & effects of TAT-SOD against ultraviolet induced skin damage.” 2013. Doctoral Dissertation, University of Edinburgh. Accessed January 24, 2021. http://hdl.handle.net/1842/10641.

MLA Handbook (7^th Edition):

Chen, Xiaochao. “Mechanism of cellular uptake of HIV-TAT peptide & effects of TAT-SOD against ultraviolet induced skin damage.” 2013. Web. 24 Jan 2021.

Vancouver:

Chen X. Mechanism of cellular uptake of HIV-TAT peptide & effects of TAT-SOD against ultraviolet induced skin damage. [Internet] [Doctoral dissertation]. University of Edinburgh; 2013. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1842/10641.

Council of Science Editors:

Chen X. Mechanism of cellular uptake of HIV-TAT peptide & effects of TAT-SOD against ultraviolet induced skin damage. [Doctoral Dissertation]. University of Edinburgh; 2013. Available from: http://hdl.handle.net/1842/10641

University of New South Wales

9. Susilo, Resta. Magnetic ordering in the quaternary R2Fe2Si2C (R = Y, Gd - Tm) intermetallic compounds.

Degree: Physical, Environmental & Mathematical Sciences, 2016, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/56698 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:41206/SOURCE02?view=true

► The magnetic ordering of the quaternary R2Fe2Si2C (Y, Gd - Tm) compounds which crystallise in the monoclinic Dy2Fe2Si2C -type structure (C2/m space group), have been… (more)

▼ The magnetic ordering of the quaternary R2Fe2Si2C (Y, Gd - Tm) compounds which crystallise in the monoclinic Dy2Fe2Si2C -type structure (C2/m space group), have been studied. The studies encompass the low temperature structural, thermal and magnetic properties of R2Fe2Si2C (Gd - Tm) and the determination of their magnetic structures. The fundamental goals of this study are to understand the interplay between the exchange interaction and the crystal field effects, relevant to the overall magnetic properties, and to determine whether or not the Fe sublattice is magnetically ordered in this series of compounds.The determination of the magnetic properties of these compounds reveals two important results: (i) Gd2Fe2Si2C orders at TN = 39 K, much higher than the previously reported value of TN ~ 9 K and (ii) Dy2Fe2Si2C exhibits two magnetic transitions at low temperatures. Systematic studies on the magnetic properties of this series of compounds show that the ordering temperatures of the R2Fe2Si2C (R = Gd - Tm) compounds deviate from the expected de Gennes scaling. This deviation can be described fully if both the exchange interaction and the crystal field effect are taken into account, indicating the significant influence of the crystal field in this series.Three types of magnetic structure were found to exist in this series of compounds. While the common magnetic structure of the R2Fe2Si2C (R = Gd - Ho) compounds involves ordering of the R sublattice along the b-axis with a propagation vector k1 = [0, 0, 1/2], the magnetic structures of Er2Fe2Si2C and Tm2Fe2Si2C are characterised by the propagation vectors k2 = [1/2 , 1/2 , 0] and k3 = [0.403(1), 1/2 ,0], respectively, with the R moments lying in the ac-plane. The origin of the evolution of magnetic structure across this series is discussed, revealing that crystal field effects play an important role in modifying the propagation vector, as well as defining the direction of the R moment.Neutron diffraction refinements alone were unable to answer the question of whether or not the Fe is magnetic in R2Fe2Si2C. However, 57Fe Mossbauer experiments provide the first unequivocal evidence that the Fe atom is non-magnetic in any member of the R2Fe2Si2C compounds. Advisors/Committee Members: Cadogan, Sean, Physical, Environmental & Mathematical Sciences, UNSW Canberra, UNSW.

Subjects/Keywords: Mossbauer spectroscopy; rare-earth magnetism; neutron diffraction

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APA (6^th Edition):

Susilo, R. (2016). Magnetic ordering in the quaternary R2Fe2Si2C (R = Y, Gd - Tm) intermetallic compounds. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/56698 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:41206/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Susilo, Resta. “Magnetic ordering in the quaternary R2Fe2Si2C (R = Y, Gd - Tm) intermetallic compounds.” 2016. Doctoral Dissertation, University of New South Wales. Accessed January 24, 2021. http://handle.unsw.edu.au/1959.4/56698 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:41206/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Susilo, Resta. “Magnetic ordering in the quaternary R2Fe2Si2C (R = Y, Gd - Tm) intermetallic compounds.” 2016. Web. 24 Jan 2021.

Vancouver:

Susilo R. Magnetic ordering in the quaternary R2Fe2Si2C (R = Y, Gd - Tm) intermetallic compounds. [Internet] [Doctoral dissertation]. University of New South Wales; 2016. [cited 2021 Jan 24]. Available from: http://handle.unsw.edu.au/1959.4/56698 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:41206/SOURCE02?view=true.

Council of Science Editors:

Susilo R. Magnetic ordering in the quaternary R2Fe2Si2C (R = Y, Gd - Tm) intermetallic compounds. [Doctoral Dissertation]. University of New South Wales; 2016. Available from: http://handle.unsw.edu.au/1959.4/56698 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:41206/SOURCE02?view=true

University of New South Wales

10. Graham, Paul. Magnetic, ferroelectric and structural phenomena in rare earth manganite and ferrite systems: Raman spectroscopy and neutron diffraction studies.

Degree: Physics, 2016, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/57141 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:42677/SOURCE02?view=true

► The discovery of emergent phenomena arising from the interplay between magnetism, ferroelectricity and structure in multiferroic materials provides a myriad of potential capabilities in future… (more)

▼ The discovery of emergent phenomena arising from the interplay between magnetism, ferroelectricity and structure in multiferroic materials provides a myriad of potential capabilities in future solid state technologies. Despite extensive investigations in this field, many unsolved issues surround magnetoelectric coupling in several multiferroic systems, and in many cases there are competing approaches that attempt to describe their underlying mechanisms. Collectively, the projects in this thesis represent a two-pronged approach that utilises the complementary techniques of Raman light scattering and neutron diffraction as a means to investigate the contentious role of crystal structure in magnetoelectric coupling for the type-II multiferroic RMnO3 (R = Tb, Dy) and RMn2O5 systems (R = Tb, Ho, Y), and furthermore in potentially-multiferroic ErFeO3.The isotopic substitution of oxygen-18 significantly modifies the lattice dynamics of transition-metal oxide systems. In many materials, this can result in isotope-induced shifts in magnetic, ferroelectric, or superconducting phase transition temperatures that provide new understanding into the underlying physical processes that define their properties. Remarkably, oxygen-isotope substitution in RMnO3 (R = Tb, Dy) systems does not alter the onset of the multiferroic regime, indicating that magnetoelectric coupling is primarily a magnetically-driven phenomenon within these compounds. The combination of Raman scattering and neutron diffraction techniques allowed several key insights to be obtained. For both RMnO3 and RMn2O5 systems, Raman spectroscopy revealed that magnetically-driven ferroelectricity imposes significant effects that alter mode energies and lifetimes which indicate displacement-induced ferroelectricity. Furthermore, we observe remarkable structural behaviours in the form of altered bond lengths or faint Bragg reflections that indicate the existence of symmetry breaking. Our Raman study on ErFeO3 presents evidence of broken symmetry hitherto unobserved, as well as the interplay between magnetism and structure from strong interactions between different magnetic sublattices. Our combined approach provides crucial answers in understanding the emergent phenomena derived from the complex interplay between magnetic, ferroelectric and structural properties within these materials. Advisors/Committee Members: Ulrich, Clemens, Physics, Faculty of Science, UNSW.

Subjects/Keywords: Ferroelectricity; Multiferroics; Magnetism; Raman Spectroscopy; Neutron Diffraction

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APA (6^th Edition):

Graham, P. (2016). Magnetic, ferroelectric and structural phenomena in rare earth manganite and ferrite systems: Raman spectroscopy and neutron diffraction studies. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/57141 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:42677/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Graham, Paul. “Magnetic, ferroelectric and structural phenomena in rare earth manganite and ferrite systems: Raman spectroscopy and neutron diffraction studies.” 2016. Doctoral Dissertation, University of New South Wales. Accessed January 24, 2021. http://handle.unsw.edu.au/1959.4/57141 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:42677/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Graham, Paul. “Magnetic, ferroelectric and structural phenomena in rare earth manganite and ferrite systems: Raman spectroscopy and neutron diffraction studies.” 2016. Web. 24 Jan 2021.

Vancouver:

Graham P. Magnetic, ferroelectric and structural phenomena in rare earth manganite and ferrite systems: Raman spectroscopy and neutron diffraction studies. [Internet] [Doctoral dissertation]. University of New South Wales; 2016. [cited 2021 Jan 24]. Available from: http://handle.unsw.edu.au/1959.4/57141 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:42677/SOURCE02?view=true.

Council of Science Editors:

Graham P. Magnetic, ferroelectric and structural phenomena in rare earth manganite and ferrite systems: Raman spectroscopy and neutron diffraction studies. [Doctoral Dissertation]. University of New South Wales; 2016. Available from: http://handle.unsw.edu.au/1959.4/57141 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:42677/SOURCE02?view=true

Royal Holloway, University of London

11. Willis, Toby. Determination of diffusion mechanisms in battery materials using quasi-elastic neutron scattering techniques.

Degree: PhD, 2017, Royal Holloway, University of London

URL: https://pure.royalholloway.ac.uk/portal/en/publications/determination-of-diffusion-mechanisms-in-battery-materials-using-quasielastic-neutron-scattering-techniques(dfe6a3ed-a1f5-40ce-b1b7-fb83ae65e276).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.792610

► The diffusion of ions within a battery material is inherently important to its capacity to charge and discharge electrons through a circuit during its normal… (more)

Subjects/Keywords: Battery; Diffusion; density functional theory (DFT); NaCoO2; LiLaTiO3; neutron diffraction; Neutron spectroscopy; Neutron scattering; crystal

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APA (6^th Edition):

Willis, T. (2017). Determination of diffusion mechanisms in battery materials using quasi-elastic neutron scattering techniques. (Doctoral Dissertation). Royal Holloway, University of London. Retrieved from https://pure.royalholloway.ac.uk/portal/en/publications/determination-of-diffusion-mechanisms-in-battery-materials-using-quasielastic-neutron-scattering-techniques(dfe6a3ed-a1f5-40ce-b1b7-fb83ae65e276).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.792610

Chicago Manual of Style (16^th Edition):

Willis, Toby. “Determination of diffusion mechanisms in battery materials using quasi-elastic neutron scattering techniques.” 2017. Doctoral Dissertation, Royal Holloway, University of London. Accessed January 24, 2021. https://pure.royalholloway.ac.uk/portal/en/publications/determination-of-diffusion-mechanisms-in-battery-materials-using-quasielastic-neutron-scattering-techniques(dfe6a3ed-a1f5-40ce-b1b7-fb83ae65e276).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.792610.

MLA Handbook (7^th Edition):

Willis, Toby. “Determination of diffusion mechanisms in battery materials using quasi-elastic neutron scattering techniques.” 2017. Web. 24 Jan 2021.

Vancouver:

Willis T. Determination of diffusion mechanisms in battery materials using quasi-elastic neutron scattering techniques. [Internet] [Doctoral dissertation]. Royal Holloway, University of London; 2017. [cited 2021 Jan 24]. Available from: https://pure.royalholloway.ac.uk/portal/en/publications/determination-of-diffusion-mechanisms-in-battery-materials-using-quasielastic-neutron-scattering-techniques(dfe6a3ed-a1f5-40ce-b1b7-fb83ae65e276).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.792610.

Council of Science Editors:

Willis T. Determination of diffusion mechanisms in battery materials using quasi-elastic neutron scattering techniques. [Doctoral Dissertation]. Royal Holloway, University of London; 2017. Available from: https://pure.royalholloway.ac.uk/portal/en/publications/determination-of-diffusion-mechanisms-in-battery-materials-using-quasielastic-neutron-scattering-techniques(dfe6a3ed-a1f5-40ce-b1b7-fb83ae65e276).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.792610

University of Delaware

12. Fudger, Sean James. Residual stress induced mechanical property enhancement in steel encapsulated light metal matrix composites.

Degree: PhD, University of Delaware, Department of Materials Science and Engineering, 2017, University of Delaware

URL: http://udspace.udel.edu/handle/19716/22630

► Macro hybridized systems consisting of steel encapsulated light metal matrix composites (MMCs) were produced with the goal of creating a low cost/light weight composite system… (more)

▼ Macro hybridized systems consisting of steel encapsulated light metal matrix composites (MMCs) were produced with the goal of creating a low cost/light weight composite system with enhanced mechanical properties. MMCs are frequently incorporated into advanced material systems due to their tailorable material properties. However, they often have insufficient ductility for many structural applications. The macro hybridized systems take advantage of the high strength, modulus, and damage tolerance of steels and high specific stiffness and low density of MMCs while mitigating the high density of steels and the poor ductility of MMCs. Furthermore, a coefficient of thermal expansion (CTE) mismatch induced residual compressive stress method is utilized as a means of improving the ductility of the MMCs and overall efficiency of the macro hybridized systems. ☐ Systems consisting of an A36, 304 stainless steel, or Nitronic® 50 stainless steel shell filled with an Al-SiC, Al-Al2O3, or Mg-B4C MMC are evaluated in this work. Upon cooling from processing temperatures, residual strains are generated due to a CTE mismatch between each of the phases. ☐ The resulting systems offer higher specific properties and a more structurally efficient system can be attained. Mechanical testing was performed and improvements in yield stress, ultimate tensile stress, and ductility were observed. However, the combination of these dissimilar materials often results in the formation of intermetallic compounds. In certain loading situations, these typically brittle intermetallic layers can result in degraded performance. X-ray Diffraction (XRD), X-ray Energy Dispersive Spectroscopy (EDS), and Electron Backscatter Diffraction (EBSD) are utilized to characterize the intermetallic layer formation at the interface between the steel and MMC. ☐ As the residual stress condition in each phase has a large impact on the mechanical property improvement, accurate quantification of these strains/stresses is paramount. X-ray Diffraction Residual Stress Analysis (XRD-RSA) or Neutron diffraction was performed on numerous systems in multiple steel shell thickness variations. The analysis shows variation in the measured strain and stress results due to outer steel thickness, difference in CTE between materials, and relative position within the composite. Improvements in mechanical properties, namely ductility and yield stress, are a direct result of these measured strains. Advisors/Committee Members: Ni, Chaoying.

Subjects/Keywords: Applied sciences; Electron backscatter diffraction; Encapsulation; Metal matrix composite; Neutron diffraction

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APA (6^th Edition):

Fudger, S. J. (2017). Residual stress induced mechanical property enhancement in steel encapsulated light metal matrix composites. (Doctoral Dissertation). University of Delaware. Retrieved from http://udspace.udel.edu/handle/19716/22630

Chicago Manual of Style (16^th Edition):

Fudger, Sean James. “Residual stress induced mechanical property enhancement in steel encapsulated light metal matrix composites.” 2017. Doctoral Dissertation, University of Delaware. Accessed January 24, 2021. http://udspace.udel.edu/handle/19716/22630.

MLA Handbook (7^th Edition):

Fudger, Sean James. “Residual stress induced mechanical property enhancement in steel encapsulated light metal matrix composites.” 2017. Web. 24 Jan 2021.

Vancouver:

Fudger SJ. Residual stress induced mechanical property enhancement in steel encapsulated light metal matrix composites. [Internet] [Doctoral dissertation]. University of Delaware; 2017. [cited 2021 Jan 24]. Available from: http://udspace.udel.edu/handle/19716/22630.

Council of Science Editors:

Fudger SJ. Residual stress induced mechanical property enhancement in steel encapsulated light metal matrix composites. [Doctoral Dissertation]. University of Delaware; 2017. Available from: http://udspace.udel.edu/handle/19716/22630

Delft University of Technology

13. Bruinen, Paul (author). Analysing Battolyser Electrodes in Operation with X-ray and Neutron Powder Diffraction.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:b5448695-f837-4b50-9656-b36a961dcc77

► The battolyser concept is based on an old fashioned nickel iron battery, consisting of a positive nickel(oxy) hydroxide electrode and negative iron (hydroxide) electrode. Research… (more)

▼ The battolyser concept is based on an old fashioned nickel iron battery, consisting of a positive nickel(oxy) hydroxide electrode and negative iron (hydroxide) electrode. Research has been performed on the structural changes of the nickel and iron electrode upon charge and discharge. A lot of research can be found for the nickel electrode, but crystal structure studies are few. Much less research is performed on the iron electrode. Therefore the structural changes of the nickel(oxy) hydroxide and iron (hydroxide) electrodes during operation are further researched. Ni(OH)2 exists in the form of an α- or β-modification and NiOOH in a β- or γ-modification. The structure of the nickel(oxy)hydroxide phases has layers of edge-sharing NiO2 octahedra, where in between guest atoms can situate. Conventional nickel electrodes operate mainly between β-Ni(OH)2 and β-NiOOH, so most research focussed on this area. Upon overcharge the γ-NiOOH is formed and when discharging a direct reduction of β-NiOOH and γ-NiOOH into β-Ni(OH)2 occurs. The research on the nickel electrode published in this thesis is compared with a previous discharge study performed by Morishita et al. In their Rietveld refinement of the β-phases an ideal and fault phase model are assumed and the weight fraction of all phases present in the samples at 0, 50, 100 and 150% of state of charge (SOC) are determined. For the iron electrode four phases can be distinguished. The pure Fe in the electrode upon discharge becomes Fe(OH)2, under deep discharge this transforms even further towards FeOOH. For the deactivation process the reaction moves towards magnetite (Fe3O4). First the battery electrodes from the shelf are analysed by SEM-edx , X-ray diffraction and neutron diffraction. Then neutron powder and X-ray diffraction analysis have been performed to study the structural changes of the electrodes during charge and discharge. The nickel electrodes are measured at various states of charge from 0 to 100% and iron electrodes 0 to 90%. Preliminary experiments for the in-situ neutron diffraction test setup are performed. Different thicknesses of quartz glass, several sizes of nickel foam current collectors are tested for the amount of their background noise. In the nickel electrode are next to the carbon, 3 phases present. In the comparison with Morishita et al. significant differences are found. The transition towards β-NiOOH and subsequently γ-NiOOH occurs faster. Already at 50% of SOC the weight fraction of β-NiOOH is 58 wt% and at 100% of SOC the γ-NiOOH is 57 wt%. The c-parameter of γ-NiOOH is in agreement with Morishita et al. with a lattice distance of 20.8 Å. Morishita et al. did not specify how they determined the state of charge, so maybe they calculated the SOC in a different way. In the iron electrode three phases are identified, namely iron (Fe), goethite (FeOOH) and magnetite (Fe3O4). This is a strange result, because where Fe(OH)2 is expected, FeOOH is found. Probably discharged too far, moving the reaction into the second discharge plateau. The weight… Advisors/Committee Members: Mulder, Fokko (mentor), Wagemaker, Marnix (graduation committee), van Eijck, Lambert (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: battolyser; neutron diffraction; x-ray diffraction; nickel-iron battery

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APA (6^th Edition):

Bruinen, P. (. (2018). Analysing Battolyser Electrodes in Operation with X-ray and Neutron Powder Diffraction. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:b5448695-f837-4b50-9656-b36a961dcc77

Chicago Manual of Style (16^th Edition):

Bruinen, Paul (author). “Analysing Battolyser Electrodes in Operation with X-ray and Neutron Powder Diffraction.” 2018. Masters Thesis, Delft University of Technology. Accessed January 24, 2021. http://resolver.tudelft.nl/uuid:b5448695-f837-4b50-9656-b36a961dcc77.

MLA Handbook (7^th Edition):

Bruinen, Paul (author). “Analysing Battolyser Electrodes in Operation with X-ray and Neutron Powder Diffraction.” 2018. Web. 24 Jan 2021.

Vancouver:

Bruinen P(. Analysing Battolyser Electrodes in Operation with X-ray and Neutron Powder Diffraction. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Jan 24]. Available from: http://resolver.tudelft.nl/uuid:b5448695-f837-4b50-9656-b36a961dcc77.

Council of Science Editors:

Bruinen P(. Analysing Battolyser Electrodes in Operation with X-ray and Neutron Powder Diffraction. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:b5448695-f837-4b50-9656-b36a961dcc77

University of St. Andrews

14. Peel, Martin D. A crystallographic study of group I niobate perovskites .

Degree: 2015, University of St. Andrews

URL: http://hdl.handle.net/10023/6530

► In this work, X-ray and neutron powder diffraction experiments and complementary solid-state NMR spectroscopy are used to characterise NaNbO₃-based perovskite phases. Samples of NaNbO₃, KₓNa₁₋ₓNbO₃… (more)

Subjects/Keywords: Perovskite; Solid-state NMR; X-ray diffraction; Neutron diffraction; Sodium niobate

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APA (6^th Edition):

Peel, M. D. (2015). A crystallographic study of group I niobate perovskites . (Thesis). University of St. Andrews. Retrieved from http://hdl.handle.net/10023/6530

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Peel, Martin D. “A crystallographic study of group I niobate perovskites .” 2015. Thesis, University of St. Andrews. Accessed January 24, 2021. http://hdl.handle.net/10023/6530.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Peel, Martin D. “A crystallographic study of group I niobate perovskites .” 2015. Web. 24 Jan 2021.

Vancouver:

Peel MD. A crystallographic study of group I niobate perovskites . [Internet] [Thesis]. University of St. Andrews; 2015. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10023/6530.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Peel MD. A crystallographic study of group I niobate perovskites . [Thesis]. University of St. Andrews; 2015. Available from: http://hdl.handle.net/10023/6530

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Manchester

15. Nervo, Laura. Characterisation of the deformation mechanisms in HCP metals by combined use of X-ray imaging and diffraction techniques.

Degree: PhD, 2015, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/characterisation-of-the-deformation-mechanisms-in-hcp-metals-by-combined-use-of-xray-imaging-and-diffraction-techniques(50fe7be6-4fbf-48e3-86de-942589bb000d).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.668547

► We envisage a fundamental study of the physical mechanisms (dislocation slip versus deformation twinning) involved in plastic deformation of hexagonal close-packed (HCP) metals like titanium… (more)

Subjects/Keywords: 539.7; deformation twinning; 3D X-ray diffraction; diffraction contrast tomography; hcp metals; Titanium; Magnesium; neutron diffraction; X-ray diffraction topography

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APA (6^th Edition):

Nervo, L. (2015). Characterisation of the deformation mechanisms in HCP metals by combined use of X-ray imaging and diffraction techniques. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/characterisation-of-the-deformation-mechanisms-in-hcp-metals-by-combined-use-of-xray-imaging-and-diffraction-techniques(50fe7be6-4fbf-48e3-86de-942589bb000d).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.668547

Chicago Manual of Style (16^th Edition):

Nervo, Laura. “Characterisation of the deformation mechanisms in HCP metals by combined use of X-ray imaging and diffraction techniques.” 2015. Doctoral Dissertation, University of Manchester. Accessed January 24, 2021. https://www.research.manchester.ac.uk/portal/en/theses/characterisation-of-the-deformation-mechanisms-in-hcp-metals-by-combined-use-of-xray-imaging-and-diffraction-techniques(50fe7be6-4fbf-48e3-86de-942589bb000d).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.668547.

MLA Handbook (7^th Edition):

Nervo, Laura. “Characterisation of the deformation mechanisms in HCP metals by combined use of X-ray imaging and diffraction techniques.” 2015. Web. 24 Jan 2021.

Vancouver:

Nervo L. Characterisation of the deformation mechanisms in HCP metals by combined use of X-ray imaging and diffraction techniques. [Internet] [Doctoral dissertation]. University of Manchester; 2015. [cited 2021 Jan 24]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/characterisation-of-the-deformation-mechanisms-in-hcp-metals-by-combined-use-of-xray-imaging-and-diffraction-techniques(50fe7be6-4fbf-48e3-86de-942589bb000d).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.668547.

Council of Science Editors:

Nervo L. Characterisation of the deformation mechanisms in HCP metals by combined use of X-ray imaging and diffraction techniques. [Doctoral Dissertation]. University of Manchester; 2015. Available from: https://www.research.manchester.ac.uk/portal/en/theses/characterisation-of-the-deformation-mechanisms-in-hcp-metals-by-combined-use-of-xray-imaging-and-diffraction-techniques(50fe7be6-4fbf-48e3-86de-942589bb000d).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.668547

16. Nervo, Laura. Characterisation of the deformation mechanisms in hcp metals by combined use of X-ray imaging and diffraction techniques.

Degree: 2015, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:272436

► We envisage a fundamental study of the physical mechanisms (dislocation slip versus deformation twinning) involved in plastic deformation of hexagonal close-packed (HCP) metals like titanium… (more)

Subjects/Keywords: deformation twinning; 3D X-ray diffraction; diffraction contrast tomography; hcp metals; Titanium; Magnesium; neutron diffraction; X-ray diffraction topography

11 more images…

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APA (6^th Edition):

Nervo, L. (2015). Characterisation of the deformation mechanisms in hcp metals by combined use of X-ray imaging and diffraction techniques. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:272436

Chicago Manual of Style (16^th Edition):

Nervo, Laura. “Characterisation of the deformation mechanisms in hcp metals by combined use of X-ray imaging and diffraction techniques.” 2015. Doctoral Dissertation, University of Manchester. Accessed January 24, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:272436.

MLA Handbook (7^th Edition):

Nervo, Laura. “Characterisation of the deformation mechanisms in hcp metals by combined use of X-ray imaging and diffraction techniques.” 2015. Web. 24 Jan 2021.

Vancouver:

Nervo L. Characterisation of the deformation mechanisms in hcp metals by combined use of X-ray imaging and diffraction techniques. [Internet] [Doctoral dissertation]. University of Manchester; 2015. [cited 2021 Jan 24]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:272436.

Council of Science Editors:

Nervo L. Characterisation of the deformation mechanisms in hcp metals by combined use of X-ray imaging and diffraction techniques. [Doctoral Dissertation]. University of Manchester; 2015. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:272436

17. Lefevre, Robin. Structures et propriétés de transports de chalcogénures complexes : Structures and transport properties of complex chalcogenides.

Degree: Docteur es, Chimie, 2017, Normandie

URL: http://www.theses.fr/2017NORMC225

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Ce travail est consacré à la synthèse et à la caractérisation de composés chalcogénures. Pour la plupart nouveaux, ces composés ont la particularité de présenter… (more)

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Ce travail est consacré à la synthèse et à la caractérisation de composés chalcogénures. Pour la plupart nouveaux, ces composés ont la particularité de présenter des structures complexes ou dont le désordre amène une certaine complexité. La première partie de ce manuscrit est consacré à l’étude du nouveau composé monocristallin Ba0,5Cr5Se8 et de la solution solide polycristalline BaxCr5Se8 (0,5 ≤ x ≤ 0,55). Ce composé fait partie de la famille des pseudo-hollandites. Sa structure cristalline a été déterminée par diffraction des rayons X sur monocristal, un abaissement de la symétrie est observé par rapport aux pseudo-hollandites usuelles. Ces composés sont antiferromagnétiques avec une température de transition unique à 58 K, la structure magnétique du composé a été déterminée par diffraction des neutrons sur échantillon polycristallin, et sa maille magnétique correspond à une maille cristalline doublée selon b et c. Les propriétés thermoélectriques des composés sont étudiées, Ba0.5Cr5Se8 présente une ZT de 0,12 à 800 K. La deuxième partie s’est d’abord focalisée sur une structure similaire à la précédente, TlIn5Se8. Toutefois trop résistif, les structures de deux nouveaux composés ont été étudiées : TlIn4,8Cr0,2Se8 et Tl0,98In13,12Se16,3Te2,7. Ce dernier présente sur certains sites un désordre considéré statique. Finalement, le dernier chapitre a permis de mettre en avant des composés de la famille de composé lamellaire MnPSe3, ayant la particularité de présenter une paire P2. La structure du nouveau composé In2Ge2Te6 est résolue et les propriétés thermoélectriques des composés InSiTe3, Cr2Si2Te6, Cr2Ge2Te6 et In2Ge2Te6 sont étudiées. Des défauts d’empilement ont été mis en lumière et expliquent l’impact sur le libre parcours moyen des phonons. L’ensemble des composés dont les propriétés thermoélectriques ont été étudiées présentent des conductivités thermiques faibles, bien en deçà du W.m-1.K-1 dans de nombreux cas. Des ZTs de 0,18 à 673 K et 0,43 à 773 K sont trouvées pour In2Ge2Te6 et Cr2Ge2Te6.

This work has been focused on synthetizing and characterising chalcogenide compounds. Most new, those compounds show complex structures or where disorder bring complexity. The first part of this manuscript is dedicated to the study of the new single-cristalline Ba0.5Cr5Se8 and of the related polycristalline solid-solution BaxCr5Se8 (0.5 ≤ x ≤ 0.55). This compound is part of the pseudo-hollandite family. Its cristalline structure has been resolved by means of single-crystal X-ray diffraction, a lowering of symetryis observed compared to usual pseudo-hollandites. All antiferromagnetic, the compounds exhibit a transition at 58 K, the magnetic structure has been resolved using neutron diffraction on polycrystal and is twice the cristalline one along b and c. Thermoelectric properties of the compounds have been studied and a maximum ZT of 0.12 is observed at 800 K for Ba0.5Cr5Se8. The second section has first focused on a similar structure to the previous one, TlIn5Se8. Although too resistive to be interesting, two new…

Advisors/Committee Members: Gascoin, Franck (thesis director).

Subjects/Keywords: Diffraction des rayons X; Diffraction des électrons; Diffraction des neutrons; Chalcogenide; Selenium; Tellurium; Thermoelectricity; Thermal conductivit; Crystallography; Magnetism; X-ray diffraction; Electron diffraction; Neutron diffraction

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APA (6^th Edition):

Lefevre, R. (2017). Structures et propriétés de transports de chalcogénures complexes : Structures and transport properties of complex chalcogenides. (Doctoral Dissertation). Normandie. Retrieved from http://www.theses.fr/2017NORMC225

Chicago Manual of Style (16^th Edition):

Lefevre, Robin. “Structures et propriétés de transports de chalcogénures complexes : Structures and transport properties of complex chalcogenides.” 2017. Doctoral Dissertation, Normandie. Accessed January 24, 2021. http://www.theses.fr/2017NORMC225.

MLA Handbook (7^th Edition):

Lefevre, Robin. “Structures et propriétés de transports de chalcogénures complexes : Structures and transport properties of complex chalcogenides.” 2017. Web. 24 Jan 2021.

Vancouver:

Lefevre R. Structures et propriétés de transports de chalcogénures complexes : Structures and transport properties of complex chalcogenides. [Internet] [Doctoral dissertation]. Normandie; 2017. [cited 2021 Jan 24]. Available from: http://www.theses.fr/2017NORMC225.

Council of Science Editors:

Lefevre R. Structures et propriétés de transports de chalcogénures complexes : Structures and transport properties of complex chalcogenides. [Doctoral Dissertation]. Normandie; 2017. Available from: http://www.theses.fr/2017NORMC225

Delft University of Technology

18. de Jong, P.H.K. Microscopic Dynamics and Structure of Liquid Lithium and Liquid Lithium-Based Alloys.

Degree: 1993, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f ; urn:NBN:nl:ui:24-uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f ; urn:NBN:nl:ui:24-uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f ; http://resolver.tudelft.nl/uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f

Subjects/Keywords: inelastic neutron scattering; neutron diffraction; dynamics

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APA (6^th Edition):

de Jong, P. H. K. (1993). Microscopic Dynamics and Structure of Liquid Lithium and Liquid Lithium-Based Alloys. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f ; urn:NBN:nl:ui:24-uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f ; urn:NBN:nl:ui:24-uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f ; http://resolver.tudelft.nl/uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f

Chicago Manual of Style (16^th Edition):

de Jong, P H K. “Microscopic Dynamics and Structure of Liquid Lithium and Liquid Lithium-Based Alloys.” 1993. Doctoral Dissertation, Delft University of Technology. Accessed January 24, 2021. http://resolver.tudelft.nl/uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f ; urn:NBN:nl:ui:24-uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f ; urn:NBN:nl:ui:24-uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f ; http://resolver.tudelft.nl/uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f.

MLA Handbook (7^th Edition):

de Jong, P H K. “Microscopic Dynamics and Structure of Liquid Lithium and Liquid Lithium-Based Alloys.” 1993. Web. 24 Jan 2021.

Vancouver:

de Jong PHK. Microscopic Dynamics and Structure of Liquid Lithium and Liquid Lithium-Based Alloys. [Internet] [Doctoral dissertation]. Delft University of Technology; 1993. [cited 2021 Jan 24]. Available from: http://resolver.tudelft.nl/uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f ; urn:NBN:nl:ui:24-uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f ; urn:NBN:nl:ui:24-uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f ; http://resolver.tudelft.nl/uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f.

Council of Science Editors:

de Jong PHK. Microscopic Dynamics and Structure of Liquid Lithium and Liquid Lithium-Based Alloys. [Doctoral Dissertation]. Delft University of Technology; 1993. Available from: http://resolver.tudelft.nl/uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f ; urn:NBN:nl:ui:24-uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f ; urn:NBN:nl:ui:24-uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f ; http://resolver.tudelft.nl/uuid:6d8e8c2c-7ba0-4cd5-9301-40c4661b351f

McMaster University

19. Maharaj, Dalini. NEUTRON STUDIES ON RARE-EARTH AND DOUBLE PEROVSKITE MAGNETIC OXIDES WITH FRUSTRATED TETRAHEDRAL ARCHITECTURES.

Degree: PhD, 2020, McMaster University

URL: http://hdl.handle.net/11375/25417

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Magnetic frustration is the underpinning theme to all of the magnetic oxide systems explored in this dissertation. The materials studied in this thesis belong to… (more)

Subjects/Keywords: double perovskite; neutron scattering; rare-earth titanates; neutron diffraction; magnetic frustration; antiferromagnetism; crystal-field excitations; x-ray synchrotron diffraction

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APA (6^th Edition):

Maharaj, D. (2020). NEUTRON STUDIES ON RARE-EARTH AND DOUBLE PEROVSKITE MAGNETIC OXIDES WITH FRUSTRATED TETRAHEDRAL ARCHITECTURES. (Doctoral Dissertation). McMaster University. Retrieved from http://hdl.handle.net/11375/25417

Chicago Manual of Style (16^th Edition):

Maharaj, Dalini. “NEUTRON STUDIES ON RARE-EARTH AND DOUBLE PEROVSKITE MAGNETIC OXIDES WITH FRUSTRATED TETRAHEDRAL ARCHITECTURES.” 2020. Doctoral Dissertation, McMaster University. Accessed January 24, 2021. http://hdl.handle.net/11375/25417.

MLA Handbook (7^th Edition):

Maharaj, Dalini. “NEUTRON STUDIES ON RARE-EARTH AND DOUBLE PEROVSKITE MAGNETIC OXIDES WITH FRUSTRATED TETRAHEDRAL ARCHITECTURES.” 2020. Web. 24 Jan 2021.

Vancouver:

Maharaj D. NEUTRON STUDIES ON RARE-EARTH AND DOUBLE PEROVSKITE MAGNETIC OXIDES WITH FRUSTRATED TETRAHEDRAL ARCHITECTURES. [Internet] [Doctoral dissertation]. McMaster University; 2020. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/11375/25417.

Council of Science Editors:

Maharaj D. NEUTRON STUDIES ON RARE-EARTH AND DOUBLE PEROVSKITE MAGNETIC OXIDES WITH FRUSTRATED TETRAHEDRAL ARCHITECTURES. [Doctoral Dissertation]. McMaster University; 2020. Available from: http://hdl.handle.net/11375/25417

University of Adelaide

20. Alipooramirabad, Houman. Welding Integrity of HSLA Welds.

Degree: 2017, University of Adelaide

URL: http://hdl.handle.net/2440/119194

► The novel approaches in modelling and experimental investigations on welding integrity for single and multi-pass high strength low alloy steel (HSLA) welds is presented here.… (more)

▼ The novel approaches in modelling and experimental investigations on welding integrity for single and multi-pass high strength low alloy steel (HSLA) welds is presented here. High level of welding stresses (mainly tensile mode) are generated during the construction of pipelines which are due to non-uniform temperature distribution and cooling rates as well as using clamps during welding and mechanical handling loads which occur during lifting the front end of pipeline to place it on supports. Existing of such high tensile stresses combined with hydrogen rich cellulosic electrodes used by Australian pipeline industry has increased the risk of Hydrogen assisted cold cracking (HACC) in the weld metal, in particular root pass of girth welding, which clearly has detrimental effect on weld integrity and its performance in service. The prediction and measurement of this welding stresses in pipeline construction was limited to a few studies. The current project was therefore started with emphasis on the effect of welding stresses on HACC susceptibility of the root pass of pipeline girth welding using Welding Institute of Canada (WIC) weldability test. 3D finite element models are developed and validated against neutron diffraction measurements to investigate the effects of various welding process parameters and regimes on residual stresses for the root pass of the WIC test. Chapter 4 presents the experimentally validated numerical simulation results of the root pass of the WIC test. However after initial modelling and experimental measurements the project was extended toward measurement of residual stresses (using neutron diffraction) for multi-pass welding in HSLA welds coupled with microstructural characterization and mechanical property studies with the view of full applicability for pipeline/ pressure vessel applications. It was found that welding parameters have significant effects on the residual stress-microstructural-mechanical property interrelationships of multipass HSLA welds. Therefore a set of welded specimens was prepared to investigate such interrelationships for the following welding parameters: Heat input effects (variable travel speed); The alterations in welding direction (welding sequence); The effects of welding process (combination of modified short arc and fluxed core arc welding versus shielded metal arc welding) It was found that increasing the heat input (reduction in welding speed) is beneficial in reduction of residual stresses. This could be correlated with the formation of microstructural constituent of mainly polygonal ferrite in the weld metal and HAZ of high heat input welds. Furthermore, there was no significant effect on the magnitude of the residual stresses, microstructural characteristics and mechanical properties when the weld deposition direction was changed. The findings also indicated using SMAW lead to significant reduction in residual stresses in comparison with the combination of MSAW+FCAW processes. The results of such investigations are presented in chapters 5-7. After… Advisors/Committee Members: Ghomashchi, Reza (advisor), School of Mechanical Engineering (school).

Subjects/Keywords: Residual stresses; Neutron diffraction technique; High strength low alloy steel; Microstructural characterization; In-situ neutron diffraction

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APA (6^th Edition):

Alipooramirabad, H. (2017). Welding Integrity of HSLA Welds. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/119194

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Alipooramirabad, Houman. “Welding Integrity of HSLA Welds.” 2017. Thesis, University of Adelaide. Accessed January 24, 2021. http://hdl.handle.net/2440/119194.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Alipooramirabad, Houman. “Welding Integrity of HSLA Welds.” 2017. Web. 24 Jan 2021.

Vancouver:

Alipooramirabad H. Welding Integrity of HSLA Welds. [Internet] [Thesis]. University of Adelaide; 2017. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/2440/119194.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Alipooramirabad H. Welding Integrity of HSLA Welds. [Thesis]. University of Adelaide; 2017. Available from: http://hdl.handle.net/2440/119194

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

21. Foucher, Damien. Impact de l'eau dans la flexibilité des MOFs : Impact of water on MOFs flexibilty.

Degree: Docteur es, Chimie, 2016, Université Paris-Saclay (ComUE)

URL: http://www.theses.fr/2016SACLV059

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Les MOFs sont des matériaux hybrides (organiques/inorganiques), nanoporeux et cristallin. La périodicité et la porosité apportent à ces matériaux des propriétés modulables par la topologie… (more)

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Les MOFs sont des matériaux hybrides (organiques/inorganiques), nanoporeux et cristallin. La périodicité et la porosité apportent à ces matériaux des propriétés modulables par la topologie des réseaux et par les interactions entre le réseau et les molécules qui peuvent pénétrer dans les nanopores. L'adsorption de molécules dans les pores permet les séparations de mélanges, la séquestration sélective de molécules, la catalyse, le stockage de l'énergie etc... La flexibilité de certains MOFs est caractérisée par des variations de volume, parfois extrêmes, pouvant modifier de manières significatives les propriétés de ces matériaux. L'eau est tout à la fois une impureté inévitable dans les usages pratiques de ces composés mais également un composant important dans la modulation de la flexibilité. Bien que les nombreuses études publiées offrent une vision globale de la flexibilité et des interactions mises en jeu lors de l'adsorption de molécules de différentes natures, l'eau reste cependant une de celles qui résistent le plus aux mesures et aux interprétations. Cette thèse a eu pour objet d'utiliser de façon conjointe la diffraction des rayons-X synchrotron, des neutrons et a résonance magnétique nucléaire (RMN), pour ré-investiguer le rôle de l'eau dans la flexibilité de deux MOFs archétypiques, le UiO-66 (ZrCDC) et le MIL-53(Al). Nos résultats ont permis d'éclairer plusieurs points critiques. Avec ZrCDC il a pu être montré qu'en présence d'eau, les deux briques de constructions, inorganique et organique, sont couplées tout en ayant chacune une flexibilité distincte. Pour MIL-53(Al), la réinvestigation a été notablement plus conséquente, reprenant le suivi de la flexibilité en température de la phase anhydre et sous l'influence des gaz composants de l'air, oxygène et azote, puis l’étude du rôle de l'eau par RMN qui permet de caractériser les modifications structurales et dynamiques des phases anhydre et hydratée. Le suivi progressif de l'adsorption et de la désorption a notamment permis de mettre en évidence des phénomènes d'échange protoniques lents responsables des hystérèses observés. Ces résultats permettent de remettre en perspective les études antécédentes et de proposer une description renouvelée de la flexibilité de ces composés, comme une "horlogerie cristalline" des mouvements moléculaires.

MOFs (metal-organic-frameworks) are hybrid (organic/inorganic) crystalline nanoporous materials. Periodicity and porosity provide to these materials modularity of properties by the topology of networks, and interactions between the framework and penetrating molecules in nanopores. Adsorption of molecules in pores allows for mixtures separation, selective sequestration of molecules, catalysis, storage of energy etc... Flexibility of some MOFs is characterized by extremes volume variations modifying properties of these materials. Water is at the same time an inevitable impurity in practical uses of such compounds and an equally significant component for modulation of flexibility. Although many published studies provide…

Advisors/Committee Members: Taulelle, Francis (thesis director), Porcher, Florence (thesis director).

Subjects/Keywords: MOFs; Flexibilité; Rmn du solide; Diffraction; Neutron; Synchrotron; MOFs; Flexibiliy; Solid-state NMR; Diffraction; Neutron; Synchrotron; 546.1

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Foucher, D. (2016). Impact de l'eau dans la flexibilité des MOFs : Impact of water on MOFs flexibilty. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2016SACLV059

Chicago Manual of Style (16^th Edition):

Foucher, Damien. “Impact de l'eau dans la flexibilité des MOFs : Impact of water on MOFs flexibilty.” 2016. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed January 24, 2021. http://www.theses.fr/2016SACLV059.

MLA Handbook (7^th Edition):

Foucher, Damien. “Impact de l'eau dans la flexibilité des MOFs : Impact of water on MOFs flexibilty.” 2016. Web. 24 Jan 2021.

Vancouver:

Foucher D. Impact de l'eau dans la flexibilité des MOFs : Impact of water on MOFs flexibilty. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2016. [cited 2021 Jan 24]. Available from: http://www.theses.fr/2016SACLV059.

Council of Science Editors:

Foucher D. Impact de l'eau dans la flexibilité des MOFs : Impact of water on MOFs flexibilty. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2016. Available from: http://www.theses.fr/2016SACLV059

Université Paris-Sud – Paris XI

22. Bousige, Colin. Structure et dynamique de systèmes unidimensionnels modèles : les nano-peapods de carbone : Structure and dynamics of model one-dimensional systems : carbon nano-peapods.

Degree: Docteur es, Physique, 2012, Université Paris-Sud – Paris XI

URL: http://www.theses.fr/2012PA112303

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Ce travail de thèse est consacré à l'étude sur une large gamme de températures d'un système unidimensionnel modèle, les nano-peapods de carbone. Ces composés sont… (more)

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Ce travail de thèse est consacré à l'étude sur une large gamme de températures d'un système unidimensionnel modèle, les nano-peapods de carbone. Ces composés sont constitués de fullerènes (C60, dans notre cas) insérés dans des nanotubes de carbone monofeuillets. Les diamètres des fullerènes et des tubes étant concordant, les fullerènes s'arrangent selon un réseau 1D.Dans le premier chapitre de ce manuscrit, nous décrivons la synthèse des peapods de carbone. Dans les deux chapitres suivants, nous décrivons les différents modèles et méthodes expérimentales qui nous permettent de déterminer l'évolution de la structure moyenne des chaînes de fullerènes, ainsi que la dynamique de rotation et de translation des molécules.Dans les trois derniers chapitres, nous décrivons l'évolution de la structure et de la dynamique des chaînes sur trois gammes de températures, que nous appelons hautes (500-1100 K), basses (0-200 K), et intermédiaires (200-500 K). Les résultats expérimentaux concernant deux types d'échantillons, les peapods monomères et les peapods polymères (dans lesquels les degrés de liberté de rotation sont restreints) sont confrontés à des modèles analytiques. Nous mettons en évidence trois comportements différents des chaînes dans ces trois gammes de température.

This work is dedicated to the study of the structural and dynamical behavior of a model one-dimensional system over a wide temperature range: carbon nano-peapods. This compound is constituted of fullerenes (C60, in our case) inserted inside single-walled carbon nanotubes. The perfect match between the inner diameter of the tubes and the diameter of the fullerenes results in a chain organization of the C60 molecules.The synthesis of these peapods is described in the first part of this manuscript. The two next chapters are aimed to the description of the different experimental and simulation methods that are used to monitor the structural and dynamical behavior of the C60 molecules.In the three last chapters, we describe the behaviour of the C60 molecules over three temperature ranges, labeled high (500-1100 K), low (0-200 K), and intermediary (200-500 K) ranges. By comparing experimental results to analytical models for both monomer and polymer peapods (the rotational degree of freedom being hindered in the latter), we highlight three different behaviors of the molecules in these three ranges.

Advisors/Committee Members: Launois, Pascale (thesis director).

Subjects/Keywords: Nanotubes; Fullerènes; Diffraction; Spectroscopie; Neutron; Modélisation; Systèmes unidimensionnels; Nanotubes; Fullerenes; Diffraction; Spectroscopy; Neutron; Modeling; One-dimensional systems

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APA (6^th Edition):

Bousige, C. (2012). Structure et dynamique de systèmes unidimensionnels modèles : les nano-peapods de carbone : Structure and dynamics of model one-dimensional systems : carbon nano-peapods. (Doctoral Dissertation). Université Paris-Sud – Paris XI. Retrieved from http://www.theses.fr/2012PA112303

Chicago Manual of Style (16^th Edition):

Bousige, Colin. “Structure et dynamique de systèmes unidimensionnels modèles : les nano-peapods de carbone : Structure and dynamics of model one-dimensional systems : carbon nano-peapods.” 2012. Doctoral Dissertation, Université Paris-Sud – Paris XI. Accessed January 24, 2021. http://www.theses.fr/2012PA112303.

MLA Handbook (7^th Edition):

Bousige, Colin. “Structure et dynamique de systèmes unidimensionnels modèles : les nano-peapods de carbone : Structure and dynamics of model one-dimensional systems : carbon nano-peapods.” 2012. Web. 24 Jan 2021.

Vancouver:

Bousige C. Structure et dynamique de systèmes unidimensionnels modèles : les nano-peapods de carbone : Structure and dynamics of model one-dimensional systems : carbon nano-peapods. [Internet] [Doctoral dissertation]. Université Paris-Sud – Paris XI; 2012. [cited 2021 Jan 24]. Available from: http://www.theses.fr/2012PA112303.

Council of Science Editors:

Bousige C. Structure et dynamique de systèmes unidimensionnels modèles : les nano-peapods de carbone : Structure and dynamics of model one-dimensional systems : carbon nano-peapods. [Doctoral Dissertation]. Université Paris-Sud – Paris XI; 2012. Available from: http://www.theses.fr/2012PA112303

University of Wollongong

23. Yan, Kun. In-situ characterization by high-energy x-ray and neutron diffraction of micro-structural evolution of selected materials during thermo-mechanical processing.

Degree: Doctor of Philosophy, 2012, University of Wollongong

URL: 0912 MATERIALS ENGINEERING ; https://ro.uow.edu.au/theses/3700

► Despite the limited opportunities in obtaining beam times and difficulties in analysing data, modern techniques of synchrotron high-energy X-ray diffraction and neutron diffraction possess… (more)

▼ Despite the limited opportunities in obtaining beam times and difficulties in analysing data, modern techniques of synchrotron high-energy X-ray diffraction and neutron diffraction possess the advantages of fast measuring speed and obtaining microstructural information from a bulk volume rather than surface. These features maintain their advantages and particularities in investigating microstructural evolution of metallic materials during thermal-mechanical processing. Over the past 15 years, considerable improvement has been made in applying these diffraction techniques with other microscopy means. The present work is concerned with the experimental study of in-situ in real time investigations of materials microstructural change during thermal-mechanical processing by high-energy X-ray diffraction and neutron diffraction. As a benchmark, plastic deformation of single grain and polycrystalline copper was measured by high-energy X-ray diffraction, during unidirectional compression at room temperature. Following this, a systemic study of deformation mechanisms of twinning-induced plasticity (TWIP) steel Fe-18Mn alloy at room temperature was carried out by high-energy X-ray diffraction and self-consistent modelling. The grain statistics and grains orientation distribution of Fe-18Mn have been characterised during various plastic deformation processing, including unidirectional tension, quasi-static compression, shock impact compression and high-pressure torsion. Influence of strain rate and total strain on texture has been specified by the advanced technique of obtaining texture from an individual 2D synchrotron diffraction image. The deformation process of TWIP steel involved the competition between dislocation sliding, mechanical twinning and even martensitic phase transformation, in some extreme condition of high-pressure torsion and shock loading. The activities of these different mechanisms during various deformation processes were predicted by both statisticity of diffraction pattern and self-consistent modelling. Following the studies of plastic deformation at room temperature, the author further studied alloys microstructural evolution at high temperature. This started from Zr- 2.5Nb, the segregation of Nb atoms between β-(Zr-Nb) phase and β-Zr phase was recorded by in-situ neutron diffraction experiments. In addition, the hot deformation behaviour of Zircalloy-4 was investigated by high-energy X-ray diffraction. Apart from the lattice relationship between α-phase and β-phase, dynamic recrystallization was also…

Subjects/Keywords: High-energy x-ray diffraction; neutron diffraction; in-situ; thermo-mechanical processing; phase transformation

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APA (6^th Edition):

Yan, K. (2012). In-situ characterization by high-energy x-ray and neutron diffraction of micro-structural evolution of selected materials during thermo-mechanical processing. (Doctoral Dissertation). University of Wollongong. Retrieved from 0912 MATERIALS ENGINEERING ; https://ro.uow.edu.au/theses/3700

Chicago Manual of Style (16^th Edition):

Yan, Kun. “In-situ characterization by high-energy x-ray and neutron diffraction of micro-structural evolution of selected materials during thermo-mechanical processing.” 2012. Doctoral Dissertation, University of Wollongong. Accessed January 24, 2021. 0912 MATERIALS ENGINEERING ; https://ro.uow.edu.au/theses/3700.

MLA Handbook (7^th Edition):

Yan, Kun. “In-situ characterization by high-energy x-ray and neutron diffraction of micro-structural evolution of selected materials during thermo-mechanical processing.” 2012. Web. 24 Jan 2021.

Vancouver:

Yan K. In-situ characterization by high-energy x-ray and neutron diffraction of micro-structural evolution of selected materials during thermo-mechanical processing. [Internet] [Doctoral dissertation]. University of Wollongong; 2012. [cited 2021 Jan 24]. Available from: 0912 MATERIALS ENGINEERING ; https://ro.uow.edu.au/theses/3700.

Council of Science Editors:

Yan K. In-situ characterization by high-energy x-ray and neutron diffraction of micro-structural evolution of selected materials during thermo-mechanical processing. [Doctoral Dissertation]. University of Wollongong; 2012. Available from: 0912 MATERIALS ENGINEERING ; https://ro.uow.edu.au/theses/3700

University of Manchester

24. Simm, Thomas. The use of diffraction peak profile analysis in studying the plastic deformation of metals.

Degree: PhD, 2013, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/the-use-of-diffraction-peak-profile-analysis-in-studying-the-plastic-deformation-of-metals(5e4f71e2-2ac7-4afe-b7c7-7a42a936c50c).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574351

► Analysis of the shapes of diffraction peak profiles (DPPA) is a widely used method for characterising the microstructure of crystalline materials. The DPPA method can… (more)

▼ Analysis of the shapes of diffraction peak profiles (DPPA) is a widely used method for characterising the microstructure of crystalline materials. The DPPA method can be used to determine details about a sample that include, the micro-strain, crystal size or dislocation cell size, dislocation density and arrangement, quantity of planar faults and dislocation slip system population.The main aim of this thesis is to evaluate the use of DPPA in studying the deformation of metals. The alloys studied are uni-axially deformed samples of nickel alloy, nickel-200, 304 and 316 stainless steel alloys and titanium alloys, Ti-6Al-4V and grade 2 CP-titanium.A number of DPPA methods were applied to these metals: a full-width method; a method that attributes size and strain broadening to the Lorentzian and Gaussian integral breadth of a Voigt; different forms of the variance method; the Williamson-Hall method; the alternative method; and variations of the Warren-Averbach method. It is found that in general the parameters calculated using the different methods qualitatively agree with the expectations and differences in the deformation of the different metals. For example, the dislocation density values found for all metals, are approximately the same as would be expected from TEM results on similar alloys. However, the meaning of the results are ambiguous, which makes it difficult to use them to characterise a metal. The most useful value that can be used to describe the state of a metal is the full-width. For a more detailed analysis the Warren-Averbach method in a particular form, the log format fitted to individual Fourier coefficients, is the most useful method.It was found that the shape of different diffraction peaks change in different texture components. These changes were found to be different for the different metals. A method to calculate the shape of diffraction peaks, in different texture components, using a polycrystal plasticity models was investigated. It was found that for FCC metals, the use of a Taylor model was able to qualitatively predict the changes in the shape of diffraction peaks, measured in different texture components. Whereas, for titanium alloys, a model which used the Schmid factor was able to qualitatively explain the changes. The differences in the FCC alloys was attributed to being due to differences in the stacking fault energy of the alloys. For nickel, which develops a heterogeneous cell structure, an additional term describing changes in the crystal size in different orientations is required. The differences between the titanium alloys were shown to be due the presence of twinning in CP-titanium and not in Ti-6Al-4V. This difference was thought to cause an additional broadening due to variations in intergranular strains in twinned and non-twinned regions. The use of polycrystal plasticity models, to explain the shape of diffraction peaks, raises questions as to the validity of some of the fundamental assumptions made in the use of most DPPA methods.

Subjects/Keywords: 620.16; X-ray diffraction; neutron diffraction; peak profile analysis; plastic deformation; titanium; stainless steel; nickel

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APA (6^th Edition):

Simm, T. (2013). The use of diffraction peak profile analysis in studying the plastic deformation of metals. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/the-use-of-diffraction-peak-profile-analysis-in-studying-the-plastic-deformation-of-metals(5e4f71e2-2ac7-4afe-b7c7-7a42a936c50c).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574351

Chicago Manual of Style (16^th Edition):

Simm, Thomas. “The use of diffraction peak profile analysis in studying the plastic deformation of metals.” 2013. Doctoral Dissertation, University of Manchester. Accessed January 24, 2021. https://www.research.manchester.ac.uk/portal/en/theses/the-use-of-diffraction-peak-profile-analysis-in-studying-the-plastic-deformation-of-metals(5e4f71e2-2ac7-4afe-b7c7-7a42a936c50c).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574351.

MLA Handbook (7^th Edition):

Simm, Thomas. “The use of diffraction peak profile analysis in studying the plastic deformation of metals.” 2013. Web. 24 Jan 2021.

Vancouver:

Simm T. The use of diffraction peak profile analysis in studying the plastic deformation of metals. [Internet] [Doctoral dissertation]. University of Manchester; 2013. [cited 2021 Jan 24]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/the-use-of-diffraction-peak-profile-analysis-in-studying-the-plastic-deformation-of-metals(5e4f71e2-2ac7-4afe-b7c7-7a42a936c50c).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574351.

Council of Science Editors:

Simm T. The use of diffraction peak profile analysis in studying the plastic deformation of metals. [Doctoral Dissertation]. University of Manchester; 2013. Available from: https://www.research.manchester.ac.uk/portal/en/theses/the-use-of-diffraction-peak-profile-analysis-in-studying-the-plastic-deformation-of-metals(5e4f71e2-2ac7-4afe-b7c7-7a42a936c50c).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574351

Duquesne University

25. Burnett, Johanna D. Synthesis and Physicochemical Characterization of Heavily Doped CuInS2 Diamond-Like Semiconductors.

Degree: PhD, Chemistry and Biochemistry, 2013, Duquesne University

URL: https://dsc.duq.edu/etd/367

► CuIn1-xFexS2(x = 0 - 0.30), Cu1-xLixInS2(x = 0 - 0.40), and Cu1 xLixIn0.90Fe0.10S2 (x = 0 - 0.40) were synthesized via high-temperature, solid-state synthesis. Rietveld… (more)

Subjects/Keywords: band gap; diamond-like semiconductor; neutron powder diffraction; photovoltaic; thermoelectric; X-ray powder diffraction

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APA (6^th Edition):

Burnett, J. D. (2013). Synthesis and Physicochemical Characterization of Heavily Doped CuInS2 Diamond-Like Semiconductors. (Doctoral Dissertation). Duquesne University. Retrieved from https://dsc.duq.edu/etd/367

Chicago Manual of Style (16^th Edition):

Burnett, Johanna D. “Synthesis and Physicochemical Characterization of Heavily Doped CuInS2 Diamond-Like Semiconductors.” 2013. Doctoral Dissertation, Duquesne University. Accessed January 24, 2021. https://dsc.duq.edu/etd/367.

MLA Handbook (7^th Edition):

Burnett, Johanna D. “Synthesis and Physicochemical Characterization of Heavily Doped CuInS2 Diamond-Like Semiconductors.” 2013. Web. 24 Jan 2021.

Vancouver:

Burnett JD. Synthesis and Physicochemical Characterization of Heavily Doped CuInS2 Diamond-Like Semiconductors. [Internet] [Doctoral dissertation]. Duquesne University; 2013. [cited 2021 Jan 24]. Available from: https://dsc.duq.edu/etd/367.

Council of Science Editors:

Burnett JD. Synthesis and Physicochemical Characterization of Heavily Doped CuInS2 Diamond-Like Semiconductors. [Doctoral Dissertation]. Duquesne University; 2013. Available from: https://dsc.duq.edu/etd/367

Virginia Tech

26. Maurya, Deepam. Synthesis-Structure-Property Relationships in Lead-Free Piezoelectric Materials.

Degree: PhD, Materials Science and Engineering, 2012, Virginia Tech

URL: http://hdl.handle.net/10919/49558

► Piezoelectric materials find applications in multitude of devices such as sensors, actuators and energy harvesters. However, most of these piezoelectric materials utilize lead-based systems which… (more)

▼ Piezoelectric materials find applications in multitude of devices such as sensors, actuators and energy harvesters. However, most of these piezoelectric materials utilize lead-based systems which are becoming serious problem owing to the restrictions imposed by regulatory agencies across the globe. In the functional ceramics community, currently there is no problem more important than to find a replacement for lead-based piezoelectrics used for actuators. The electromechanical properties required for actuators (high piezoelectric constant, high coupling factor, low loss, and high transition temperatures) for known lead-free compositions are, however, far inferior to those of lead-based systems. There are three lines of research for addressing this fundamental problem "C (i) search for new systems through a combination of theory-based prediction followed by experimental effort (doping, solid solutions having a morphotropic (M) or polymorphic (P) phase boundary (PB), (iii) stabilization of metastable phases or finding the high temperature triclinic systems, and (iii) improving the properties of known compositions through microstructure optimization, domain engineering and multilayering. All these approaches are challenging and require innovation to make a significant impact on the current state-of-the-art. In this thesis, the later line of research was focused which is promising for near future applications, as it builds upon the known material systems with high depoling temperatures that have demonstrated the potential to be practical. In the first chapter, a novel method for the synthesis of lead-free (1-x)(Na0.5Bi0.5)TiO3 "C xBaTiO3 piezoelectric ceramics was investigated. Initially, multiple compositions around morphotrpic phase boundary (MPB) were synthesized to identify the optimum composition 0.93Na0.5Bi0.5TiO3-0.07BaTiO3 (NBT-BT) for electromechanical effect. The new synthesis method starts with the synthesis of Na2Ti6O13 (NTO) whiskers which are then transformed into lead-free NBT-BT ceramics. Synthesis of NTO whiskers was performed using molten salt synthesis (MSS) method. Tape casting method was used to align the whiskers in base matrix powder and subjected to various processing temperatures to elucidate the microstructure and texture evolution. For this, scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), atomic force microscopy (AFM) and energy dispersive spectroscopy (EDS) analysis were used as principal tools. The sintering process can be understood by dividing it into three stages, namely (i) transformation of monoclinic whiskers in to NBT-BT perovskite phase through topochemical reaction (<800 °C), (ii) localized sintering confined on single whisker (800-1050 °C), and (iii) liquid phase sintering as densification and grain growth occurs in the whole matrix (>1050 °C). The concentric growth ledges observed on grain surfaces were found to be preferably confined on the corners of cubical grains indicating <111> growth direction. The Lotgering factor… Advisors/Committee Members: Priya, Shashank (committeechair), Suchicital, Carlos T A. (committee member), Aning, Alexander O. (committee member), Heremans, Jean Joseph (committee member), Viehland, Dwight D. (committee member).

Subjects/Keywords: Lead-free; piezoelectric; ferroelectric; domain; transmission electron microscopy; neutron diffraction; X-ray diffraction

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APA (6^th Edition):

Maurya, D. (2012). Synthesis-Structure-Property Relationships in Lead-Free Piezoelectric Materials. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/49558

Chicago Manual of Style (16^th Edition):

Maurya, Deepam. “Synthesis-Structure-Property Relationships in Lead-Free Piezoelectric Materials.” 2012. Doctoral Dissertation, Virginia Tech. Accessed January 24, 2021. http://hdl.handle.net/10919/49558.

MLA Handbook (7^th Edition):

Maurya, Deepam. “Synthesis-Structure-Property Relationships in Lead-Free Piezoelectric Materials.” 2012. Web. 24 Jan 2021.

Vancouver:

Maurya D. Synthesis-Structure-Property Relationships in Lead-Free Piezoelectric Materials. [Internet] [Doctoral dissertation]. Virginia Tech; 2012. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10919/49558.

Council of Science Editors:

Maurya D. Synthesis-Structure-Property Relationships in Lead-Free Piezoelectric Materials. [Doctoral Dissertation]. Virginia Tech; 2012. Available from: http://hdl.handle.net/10919/49558

University of New South Wales

27. Liu, Lisha. Electromechanical Strain Mechanisms and Magnetoelectric Coupling in Polycrystalline Bismuth Ferrite.

Degree: Materials Science & Engineering, 2018, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/60394 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:52007/SOURCE02?view=true

► Bismuth ferrite, BiFeO3, is both a piezoelectric and multiferroic material with coupled ferroelectricity, ferroelasticity and antiferromagnetism, which can significantly improve the functional capabilities of devices.… (more)

▼ Bismuth ferrite, BiFeO3, is both a piezoelectric and multiferroic material with coupled ferroelectricity, ferroelasticity and antiferromagnetism, which can significantly improve the functional capabilities of devices. There are also other desirable properties of bismuth ferrite, including the absence of lead and high Neel and Curie temperatures well above room temperature. Additionally, it displays conductive ferroelectric domain walls that have applications in novel electronic applications. In this thesis, specialised solid state synthesis techniques were used to fabricate phase-pure polycrystalline BiFeO3 ceramics. The macroscopic dielectric and piezoelectric properties were studied and their structural origins were explored using in situ synchrotron X-ray and neutron diffraction. Firstly, the field-dependent nonlinearity of macroscopic strains under sub-coercive field cycling was studied using in situ X-ray diffraction, coupled with measurements of the macroscopic strain. This was followed by studying the Maxwell-Wagner frequency dispersion of macroscopic piezoelectric coefficient and the microscopic strain mechanism contributions via in situ sub-coercive field application. It was found that the domain wall motion and lattice strain decouple from each other. This was shown, by an analytical model, to be due to conductive domain walls. Post-poling relaxation of the macroscopic piezoelectric coefficient and domain texture was also investigated using an ex situ method and in situ synchrotron X-ray diffraction. The phenomenon is ascribed to defect dipoles in the system. Lastly, the coupling of antiferromagnetic and ferroelectric domain texture in the polycrystalline ceramic was studied by in situ neutron diffraction.Based on the results of in situ X-ray diffraction and neutron diffraction with application of electric field, the microscopic contribution to the bulk response and multiferroic order parameter coupling are studied comprehensively. These data are expected to provide valuable information for improving its piezoelectric and multiferroic properties in future studies. Advisors/Committee Members: Daniels, John, Materials Science & Engineering, Faculty of Science, UNSW.

Subjects/Keywords: In situ X-ray diffraction; Multiferroics; Bismuth ferrite; In situ neutron diffraction

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APA (6^th Edition):

Liu, L. (2018). Electromechanical Strain Mechanisms and Magnetoelectric Coupling in Polycrystalline Bismuth Ferrite. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/60394 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:52007/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Liu, Lisha. “Electromechanical Strain Mechanisms and Magnetoelectric Coupling in Polycrystalline Bismuth Ferrite.” 2018. Doctoral Dissertation, University of New South Wales. Accessed January 24, 2021. http://handle.unsw.edu.au/1959.4/60394 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:52007/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Liu, Lisha. “Electromechanical Strain Mechanisms and Magnetoelectric Coupling in Polycrystalline Bismuth Ferrite.” 2018. Web. 24 Jan 2021.

Vancouver:

Liu L. Electromechanical Strain Mechanisms and Magnetoelectric Coupling in Polycrystalline Bismuth Ferrite. [Internet] [Doctoral dissertation]. University of New South Wales; 2018. [cited 2021 Jan 24]. Available from: http://handle.unsw.edu.au/1959.4/60394 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:52007/SOURCE02?view=true.

Council of Science Editors:

Liu L. Electromechanical Strain Mechanisms and Magnetoelectric Coupling in Polycrystalline Bismuth Ferrite. [Doctoral Dissertation]. University of New South Wales; 2018. Available from: http://handle.unsw.edu.au/1959.4/60394 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:52007/SOURCE02?view=true

University of New South Wales

28. Chang, Fenfen. Search for novel multifunctional materials: a comprehensive neutron and synchrotron diffraction study on cobaltates and spinels.

Degree: Physics, 2017, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/57563 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43656/SOURCE02?view=true

► Multiferroics exhibit tremendous potential in technological applications, of which the interplaybetween the ferro-/antiferromagnetic, ferroelectricity, and ferroelasticity can be manipulatedby external parameters such as electric or… (more)

▼ Multiferroics exhibit tremendous potential in technological applications, of which the interplaybetween the ferro-/antiferromagnetic, ferroelectricity, and ferroelasticity can be manipulatedby external parameters such as electric or magnetic fields and even can be created byproper control of internal parameters, such as oxygen-content, cation doping, and internalpressure. Invaluable insight into the multiferroicity can be provided by investigating the roleof such parameters in the crystallographic and magnetic structures of transition metal oxides.In this thesis, a comprehensive studies of contribution of oxygen-deficiencies and cation dopingto the various phases are presented, which utilize the neutron and synchrotron powderdiffraction.The multivalent nature of cobalt ions in SrCoO3􀀀d causes an oxygen-content dependentphase diagram. It is vital to determine the precise crystallographic and magnetic structure ofoxygen-vacancy ordered SrCoO3􀀀d , which provides prerequisite to reveal the mechanism ofits multiferroicity in the corresponding thin film samples. Using the neutron and synchrotronpowder diffraction techniques, the correct space group and precise magnetic structures aredetermined for the different oxygen-vacancy ordered phases: the brownmillerite SrCoO2:5,the tetragonal SrCoO2:875, and the cubic SrCoO3.Ferroelectricity can be induced by the canted spin configuration, which exists widely inthe frustrated spin systems. With such an expectation, Zn-substituted CuFe2O4 was studiedand a comprehensive phase diagram was built for Cu1􀀀xZnxFe2O4. Spin canting couldlead to a spin spiral phase which could possibly induce a multiferroic state as observed inCuFeO2. The purpose of this project was to further investigate the spin canting in ZndopedCuFe2O4 and elucidate the possibility of multiferroicity in this system. Furthermore,pure ZnFe2O4 is already an interesting highly frustrated spin system. Magnetite is the oldestknown magnet. As the first known multiferroics, the ferroelectricity in Fe3O4 is drivenby the Verwey transition. However, the microscopic origin of the Verwey transition in Fe3O4is still in debate. In order to obtain a deeper insight into the mechanism of the charge ordering,Cu-doped Fe3O4 was investigated using the high-resolution neutron and synchrotrondiffraction. The main emphasis was the stability of the Verwey transition with charge carrierdoping. Advisors/Committee Members: Ulrich, Clemens, Physics, Faculty of Science, UNSW, Sushkov, Oleg, Physics, Faculty of Science, UNSW.

Subjects/Keywords: Oxygen vacancy ordering; Neutron diffraction; Synchrotron powder diffraction; Verwey transition; Charge ordering

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APA (6^th Edition):

Chang, F. (2017). Search for novel multifunctional materials: a comprehensive neutron and synchrotron diffraction study on cobaltates and spinels. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/57563 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43656/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Chang, Fenfen. “Search for novel multifunctional materials: a comprehensive neutron and synchrotron diffraction study on cobaltates and spinels.” 2017. Doctoral Dissertation, University of New South Wales. Accessed January 24, 2021. http://handle.unsw.edu.au/1959.4/57563 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43656/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Chang, Fenfen. “Search for novel multifunctional materials: a comprehensive neutron and synchrotron diffraction study on cobaltates and spinels.” 2017. Web. 24 Jan 2021.

Vancouver:

Chang F. Search for novel multifunctional materials: a comprehensive neutron and synchrotron diffraction study on cobaltates and spinels. [Internet] [Doctoral dissertation]. University of New South Wales; 2017. [cited 2021 Jan 24]. Available from: http://handle.unsw.edu.au/1959.4/57563 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43656/SOURCE02?view=true.

Council of Science Editors:

Chang F. Search for novel multifunctional materials: a comprehensive neutron and synchrotron diffraction study on cobaltates and spinels. [Doctoral Dissertation]. University of New South Wales; 2017. Available from: http://handle.unsw.edu.au/1959.4/57563 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43656/SOURCE02?view=true

29. Dahal, Jinesh. In situ diffraction investigations of mechanisms that lead to path dependent mechanical behaviours of nickel-titanium shape memory alloys.

Degree: PhD, Mechanical Engineering, 2020, Colorado School of Mines

URL: http://hdl.handle.net/11124/174075

► Development and characterization of Shape Memory alloys (SMAs) has taken big steps over half a century in understanding the role of alloying components, processing of… (more)

▼ Development and characterization of Shape Memory alloys (SMAs) has taken big steps over half a century in understanding the role of alloying components, processing of alloys and microstructural optimization to real life engineering application. This has aided in the growth of application of SMAs to multi-billion-dollar industry but the component design with SMAs still follows that traditional route of prototyping and laboratory testing. Implementation of numerical simulations would help in making component’s design-time more efficient and design-cycle cost effective, but few bottle necks are present to fully implement the numerical models. Out of them, lack of multiaxial experimental data to deconvolute and interpret the role of multiple deformation mechanism has been on the top priority. Historically, lack of experimental capabilities to study in situ deformation mechanism like phase transformation and reorientation of variants was the main hindrance. But with development of modern diffraction technique, it has been possible to study deformation and correlate them with microstructure evolution. In this current work, we aim to provide some insights quantify evolution of internal state variables (ISVs) like volume fraction under biaxial loading conditions.The first part of the thesis examines the role of loading history on reorientation mechanics of martensitic NiTi. Deformation under mechanical loads of two sets of specimens with different initial microstructure were compared. Neutron diffraction data were collected at different interval for the texture evolution information. First set of samples with “Preferred Variants” deformed by deformation twins along with transformation twins whereas “Self-Accommodated” samples showed reoriented by transformation twins only. Although, the samples have same processing route, alterations in microstructure caused variation in stress strain response highlighting the influence of loading history. In the second part, austenitic NiTi are subjected to three loading paths under biaxial loading conditions and diffraction data are collected from neutron diffraction and HEDM experiments at various loads. Three loading paths included both proportional and non-proportional mechanical loads on a cruciform sample and evolution of volume fraction can be studied independently for different paths. Different volume fraction of austenite was obtained upon loading to same strain value as loading path influenced the transformation kinetics. The contribution from transformation kinetics to total strain was higher than the reorientation of martensitic phase at the current loading levels. The results show volume fraction evolution are path dependent in nature. Change of loading path change the favorability of austenite grains and new set of grains transformed that gave continuation to transformation kinetics. Thus, from the current analysis, we provide a method to quantify volume fraction analysis during biaxial loading that is first data set of the its kind. The other important outcome of the current… Advisors/Committee Members: Stebner, Aaron P. (advisor), Clarke, Amy (committee member), Kappes, Branden Bernard (committee member), Amin-Ahmadi, Behnam (committee member).

Subjects/Keywords: multiaxial loading; NiTiNOL; shape memory alloys; neutron diffraction; high energy x-ray diffraction; path dependence

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APA (6^th Edition):

Dahal, J. (2020). In situ diffraction investigations of mechanisms that lead to path dependent mechanical behaviours of nickel-titanium shape memory alloys. (Doctoral Dissertation). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/174075

Chicago Manual of Style (16^th Edition):

Dahal, Jinesh. “In situ diffraction investigations of mechanisms that lead to path dependent mechanical behaviours of nickel-titanium shape memory alloys.” 2020. Doctoral Dissertation, Colorado School of Mines. Accessed January 24, 2021. http://hdl.handle.net/11124/174075.

MLA Handbook (7^th Edition):

Dahal, Jinesh. “In situ diffraction investigations of mechanisms that lead to path dependent mechanical behaviours of nickel-titanium shape memory alloys.” 2020. Web. 24 Jan 2021.

Vancouver:

Dahal J. In situ diffraction investigations of mechanisms that lead to path dependent mechanical behaviours of nickel-titanium shape memory alloys. [Internet] [Doctoral dissertation]. Colorado School of Mines; 2020. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/11124/174075.

Council of Science Editors:

Dahal J. In situ diffraction investigations of mechanisms that lead to path dependent mechanical behaviours of nickel-titanium shape memory alloys. [Doctoral Dissertation]. Colorado School of Mines; 2020. Available from: http://hdl.handle.net/11124/174075

University of St. Andrews

30. Downie, Lewis James. Structure and properties of some triangular lattice materials .

Degree: 2014, University of St. Andrews

URL: http://hdl.handle.net/10023/4423

► This thesis is concerned with the study of two families of materials which contain magnetically frustrated triangular lattices. Each material is concerned with a different… (more)

▼ This thesis is concerned with the study of two families of materials which contain magnetically frustrated triangular lattices. Each material is concerned with a different use; the first, analogues of YMnO₃, is from a family of materials called multiferroics, the second, A₂MCu₃F₁₂ (where A = Rb¹⁺, Cs¹⁺, M = Zr⁴⁺, Sn⁴⁺, Ti⁴⁺, Hf⁴⁺), are materials which are of interest due to their potentially unusual magnetic properties deriving from a highly frustrated Cu²⁺-based kagome lattice. YFeO₃, YbFeO₃ and InFeO₃ have been synthesised as their hexagonal polymorphs. YFeO₃ and YbFeO₃ have been studied in depth by neutron powder diffraction, A.C. impedance spectroscopy, Mössbauer spectroscopy and magnetometry. It was found that YFeO₃ and YbFeO₃ are structurally similar to hexagonal YMnO₃ but there is evidence for a subtle phase separation in each case. Low temperature magnetic properties are also reported, and subtle correlations between the structural, electrical and magnetic properties of these materials have been found. InFeO₃ was found to adopt a higher symmetry and is structurally similar to the high temperature phase of YMnO₃. TbInO₃ and DyInO₃ have also been synthesised and studied at various temperatures. The phase behaviour of TbInO₃ was analysed in detail using neutron powder diffraction and internal structural changes versus temperature were mapped out – there is also evidence for a subtle isosymmetric phase transition. Neither DyInO₃ nor TbInO₃ show long-range magnetic order between 2 and 300 K, or any signs of ferroelectricity at room temperature. The new compounds Cs₂TiCu₃F₁₂ and Rb₂TiCu₃F₁₂ have both been synthesised and shown to be novel kagome lattice based materials. The former shows a transition from rhombohedral to monoclinic symmetry in the powder form and from rhombohedral to a larger rhombohedral unit cell in the single crystal – a particle size based transition pathway is suggested. For Rb₂TiCu₃F₁₂ a complex triclinic unit cell is found, which distorts with lowering temperature. Both materials show magnetic transitions with lowering temperature. The solid solution Cs₂₋ₓRbₓSnCu₃F₁₂ (x = 0, 0.5, 1.0, 1.5, 2.0) was synthesised and investigated crystallographically, demonstrating a range of behaviours. Rb₂SnCu₃F₁₂ displays a rare re-entrant structural phase transition. In contrast, Cs₀.₅Rb₁.₅SnCu₃F₁₂ shows only the first transition found in the Rb⁺ end member. CsRbSnCu₃F₁₂ adopts a lower symmetry at both room temperature and below. Cs₁.₅Rb₀.₅SnCu₃F₁₂ and Cs₂SnCu₃F₁₂ show a rhombohedral - monoclinic transition, which is similar to that found in Cs₂TiCu₃F₁₂. Advisors/Committee Members: Lightfoot, Philip (advisor).

Subjects/Keywords: Solid state chemistry; Fluorides; Oxides; Crystallography; Magnetism; Ferroelectrics; Neutron diffraction; Synchrotron X-ray diffraction

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APA (6^th Edition):

Downie, L. J. (2014). Structure and properties of some triangular lattice materials . (Thesis). University of St. Andrews. Retrieved from http://hdl.handle.net/10023/4423

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Downie, Lewis James. “Structure and properties of some triangular lattice materials .” 2014. Thesis, University of St. Andrews. Accessed January 24, 2021. http://hdl.handle.net/10023/4423.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Downie, Lewis James. “Structure and properties of some triangular lattice materials .” 2014. Web. 24 Jan 2021.

Vancouver:

Downie LJ. Structure and properties of some triangular lattice materials . [Internet] [Thesis]. University of St. Andrews; 2014. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10023/4423.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Downie LJ. Structure and properties of some triangular lattice materials . [Thesis]. University of St. Andrews; 2014. Available from: http://hdl.handle.net/10023/4423

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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