subject:(High pressure cell)

Princeton University

1. Dutta, Rajkrishna. High-Pressure Studies of Oxides and Fluorides: Analogs for Ultra-High Pressure Behavior of Planetary Silicates.

Degree: PhD, 2019, Princeton University

URL: http://arks.princeton.edu/ark:/88435/dsp01d217qs394

► Analog materials are compounds that can be used as models of polymorphism in planetary silicates at lower, more experimentally accessible pressures. Super-Earths, defined here as… (more)

▼ Analog materials are compounds that can be used as models of polymorphism in planetary silicates at lower, more experimentally accessible pressures. Super-Earths, defined here as extrasolar planets of 1-10 Earth masses, are expected to have pressure, temperature conditions much higher than the Earth. Terrestrial-type exoplanets are estimated to be Earth-like but may encompass a broader range of bulk compositions. Phases in the deep interior may therefore be substantially different, which in turn may affect the evolution and dynamics of these planets. In this work I studied analogs for two major compositions relevant to earth mantle: (Mg,Fe)SiO3 and SiO2. I combined laser-heated diamond anvil cell experiments combined with in situ synchrotron x-ray diffraction to reveal the structure of high-pressure phases at pressure and temperature conditions exceeding 2 Mbars and 5000 K. Germanates have long been recognized as one of the most useful analogs for silicates. Here I focused on FeGeO3 as an analog for the high-pressure behavior of iron-rich silicates. In this work, I have reported both the room temperature and high-temperature behavior of FeGeO3 to 123 GPa and ~2100 K. FeGeO3 clinopyroxene was found to undergo a pressure-induced phase transition at ~18 GPa at room temperature. The diffraction pattern was consistent with the previously identified FeGeO3 (II) structure. On increasing pressure, the diffraction peaks broadened and there was evidence for another phase transition between 54 and 86 GPa. This unknown phase remained stable at room temperature up to 123 GPa, the peak pressure considered here. In contrast to previous studies, I did not find any evidence for formation of FeGeO3 in the perovskite structure at ~ 40 GPa and 300 K. On laser heating at 33, 54 and 123 GPa, FeGeO3 dissociated into a mixture of GeO2 (rutile/ CaCl2, α-PbO2 and pyrite-type phases respectively) and FeO (B1/ B1 + rB1). This result is consistent with previous findings for FeSiO3, which has been shown to dissociate into its respective oxides (SiO2 + FeO) up to 149 GPa. Neighborite, NaMgF3, can serve as an analog for the-high pressure behavior in the MgSiO3 system at conditions relevant to large extra-solar planets. It is recognized to be a useful analog on the basis of structural parameters such as lattice parameter ratios, bond length ratios, and atomic positions. I examined the high-pressure phase transitions in NaMgF3 to 1.6 Mbars. This work elucidated for the first time the complex sequence of high-pressure phases beyond post-perovskite in an ABX3 system. I showed that the phase transition sequence in NaMgF3 is: NaMgF3 (perovskite)  NaMgF3 (post-perovskite)  NaMgF3 (Sb2S3-type)  NaF (B2-type) + NaMg2F5 (P21/c)  NaF (B2) + MgF2 (cotunnite-type). My results demonstrated the existence of a post-post-perovskite phase, followed a two-stage dissociation into binary fluorides. This work is the first experimental report of a dissociation of a post-perovskite in any ABX3 system. Crystalline GeO2 follows a similar… Advisors/Committee Members: Duffy, Thomas S (advisor).

Subjects/Keywords: Analogs; Diamond anvil cell; High-pressure

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

APA (6^th Edition):

Dutta, R. (2019). High-Pressure Studies of Oxides and Fluorides: Analogs for Ultra-High Pressure Behavior of Planetary Silicates. (Doctoral Dissertation). Princeton University. Retrieved from http://arks.princeton.edu/ark:/88435/dsp01d217qs394

Chicago Manual of Style (16^th Edition):

Dutta, Rajkrishna. “High-Pressure Studies of Oxides and Fluorides: Analogs for Ultra-High Pressure Behavior of Planetary Silicates. ” 2019. Doctoral Dissertation, Princeton University. Accessed January 25, 2021. http://arks.princeton.edu/ark:/88435/dsp01d217qs394.

MLA Handbook (7^th Edition):

Dutta, Rajkrishna. “High-Pressure Studies of Oxides and Fluorides: Analogs for Ultra-High Pressure Behavior of Planetary Silicates. ” 2019. Web. 25 Jan 2021.

Vancouver:

Dutta R. High-Pressure Studies of Oxides and Fluorides: Analogs for Ultra-High Pressure Behavior of Planetary Silicates. [Internet] [Doctoral dissertation]. Princeton University; 2019. [cited 2021 Jan 25]. Available from: http://arks.princeton.edu/ark:/88435/dsp01d217qs394.

Council of Science Editors:

Dutta R. High-Pressure Studies of Oxides and Fluorides: Analogs for Ultra-High Pressure Behavior of Planetary Silicates. [Doctoral Dissertation]. Princeton University; 2019. Available from: http://arks.princeton.edu/ark:/88435/dsp01d217qs394

Princeton University

2. Dutta, Rajkrishna. High-Pressure Studies of Oxides and Fluorides: Analogs for Ultra-High Pressure Behavior of Planetary Silicates.

Degree: PhD, 2019, Princeton University

URL: http://arks.princeton.edu/ark:/88435/dsp01sf2688025

► Analog materials are compounds that can be used as models of polymorphism in planetary silicates at lower, more experimentally accessible pressures. Super-Earths, defined here as… (more)

▼ Analog materials are compounds that can be used as models of polymorphism in planetary silicates at lower, more experimentally accessible pressures. Super-Earths, defined here as extrasolar planets of 1-10 Earth masses, are expected to have pressure, temperature conditions much higher than the Earth. Terrestrial-type exoplanets are estimated to be Earth-like but may encompass a broader range of bulk compositions. Phases in the deep interior may therefore be substantially different, which in turn may affect the evolution and dynamics of these planets. In this work I studied analogs for two major compositions relevant to earth mantle: (Mg,Fe)SiO3 and SiO2. I combined laser-heated diamond anvil cell experiments combined with in situ synchrotron x-ray diffraction to reveal the structure of high-pressure phases at pressure and temperature conditions exceeding 2 Mbars and 5000 K. Germanates have long been recognized as one of the most useful analogs for silicates. Here I focused on FeGeO3 as an analog for the high-pressure behavior of iron-rich silicates. In this work, I have reported both the room temperature and high-temperature behavior of FeGeO3 to 123 GPa and ~2100 K. FeGeO3 clinopyroxene was found to undergo a pressure-induced phase transition at ~18 GPa at room temperature. The diffraction pattern was consistent with the previously identified FeGeO3 (II) structure. On increasing pressure, the diffraction peaks broadened and there was evidence for another phase transition between 54 and 86 GPa. This unknown phase remained stable at room temperature up to 123 GPa, the peak pressure considered here. In contrast to previous studies, I did not find any evidence for formation of FeGeO3 in the perovskite structure at ~ 40 GPa and 300 K. On laser heating at 33, 54 and 123 GPa, FeGeO3 dissociated into a mixture of GeO2 (rutile/ CaCl2, α-PbO2 and pyrite-type phases respectively) and FeO (B1/ B1 + rB1). This result is consistent with previous findings for FeSiO3, which has been shown to dissociate into its respective oxides (SiO2 + FeO) up to 149 GPa. Neighborite, NaMgF3, can serve as an analog for the-high pressure behavior in the MgSiO3 system at conditions relevant to large extra-solar planets. It is recognized to be a useful analog on the basis of structural parameters such as lattice parameter ratios, bond length ratios, and atomic positions. I examined the high-pressure phase transitions in NaMgF3 to 1.6 Mbars. This work elucidated for the first time the complex sequence of high-pressure phases beyond post-perovskite in an ABX3 system. I showed that the phase transition sequence in NaMgF3 is: NaMgF3 (perovskite)  NaMgF3 (post-perovskite)  NaMgF3 (Sb2S3-type)  NaF (B2-type) + NaMg2F5 (P21/c)  NaF (B2) + MgF2 (cotunnite-type). My results demonstrated the existence of a post-post-perovskite phase, followed a two-stage dissociation into binary fluorides. This work is the first experimental report of a dissociation of a post-perovskite in any ABX3 system. Crystalline GeO2 follows a similar… Advisors/Committee Members: Duffy, Thomas S (advisor).

Subjects/Keywords: Analogs; Diamond anvil cell; High-pressure

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

APA (6^th Edition):

Dutta, R. (2019). High-Pressure Studies of Oxides and Fluorides: Analogs for Ultra-High Pressure Behavior of Planetary Silicates. (Doctoral Dissertation). Princeton University. Retrieved from http://arks.princeton.edu/ark:/88435/dsp01sf2688025

Chicago Manual of Style (16^th Edition):

Dutta, Rajkrishna. “High-Pressure Studies of Oxides and Fluorides: Analogs for Ultra-High Pressure Behavior of Planetary Silicates. ” 2019. Doctoral Dissertation, Princeton University. Accessed January 25, 2021. http://arks.princeton.edu/ark:/88435/dsp01sf2688025.

MLA Handbook (7^th Edition):

Dutta, Rajkrishna. “High-Pressure Studies of Oxides and Fluorides: Analogs for Ultra-High Pressure Behavior of Planetary Silicates. ” 2019. Web. 25 Jan 2021.

Vancouver:

Dutta R. High-Pressure Studies of Oxides and Fluorides: Analogs for Ultra-High Pressure Behavior of Planetary Silicates. [Internet] [Doctoral dissertation]. Princeton University; 2019. [cited 2021 Jan 25]. Available from: http://arks.princeton.edu/ark:/88435/dsp01sf2688025.

Council of Science Editors:

Dutta R. High-Pressure Studies of Oxides and Fluorides: Analogs for Ultra-High Pressure Behavior of Planetary Silicates. [Doctoral Dissertation]. Princeton University; 2019. Available from: http://arks.princeton.edu/ark:/88435/dsp01sf2688025

University of Arkansas

3. Nepal, Sudip. Response of Bacterial Cells to Fluctuating Environment.

Degree: MS, 2015, University of Arkansas

URL: https://scholarworks.uark.edu/etd/1404

► We have studied morphological and genomic variations occurring in a mesophilic bacterium Escherichia coli (E. coli) in a wide range of continuous and fluctuating… (more)

▼ We have studied morphological and genomic variations occurring in a mesophilic bacterium Escherichia coli (E. coli) in a wide range of continuous and fluctuating hydrostatic pressures. For all the studies here the temperature is maintained at 37◦C, the optimal growth tem- perature of E. coli at atmospheric pressure. Cell division is inhibited at high hydrostatic pressures resulting in an increase of cell length. The increase of cell-length depends on the extent and duration of the stress applied on bacterial cells. We have studied the effect of high pressure stress in three different conditions – (i) Wild-type cells (almost no genetic mutations), (ii) cells cloned with a plasmid DNA containing mreB gene under lac promoter (but no induction of the gene expression), and (iii) cells cloned with a plasmid DNA con- taining mreB gene with induction of the gene expression. We find that, the cellular response of the cells is different in the three cases studied here. Specifically, we find that, the wild- type bacteria with no addition of a plasmid DNA are stressed the least at high pressure as compared to bacterial cells containing plasmid DNA. Moreover, our results suggest that, the cells containing a plasmid DNA upon induction of the gene expression are stressed the most and exhibit higher propensity of lack of cell division at high pressure. We have quantified the propensity of lack of cell division in different conditions by quantifying the probability distribution of the cell length. We find that, the probability distribution of the length of bacterial cells with a plasmid DNA show multiple peaks whereas wild-type bacterial cells show single peaked distribution. Next, we applied the oscillatory pressure. We find that, the average cell-length of bacteria decreases with τ suggesting that, the elongation of cells at high pressure is reversible. It is observed that the average length (< l >) of the bacte- rial cells revert back to the length of the bacterial cells at atmospheric pressure for τ ≈ 20 minutes for all the cases studied here. Advisors/Committee Members: Pradeep Kumar, Ravi D. Barabote, Jiali Li.

Subjects/Keywords: Biological sciences; Bacterial response; Fluctuating pressure; High pressure; Reversibility of morphology; Biophysics; Cell Biology

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APA (6^th Edition):

Nepal, S. (2015). Response of Bacterial Cells to Fluctuating Environment. (Masters Thesis). University of Arkansas. Retrieved from https://scholarworks.uark.edu/etd/1404

Chicago Manual of Style (16^th Edition):

Nepal, Sudip. “Response of Bacterial Cells to Fluctuating Environment.” 2015. Masters Thesis, University of Arkansas. Accessed January 25, 2021. https://scholarworks.uark.edu/etd/1404.

MLA Handbook (7^th Edition):

Nepal, Sudip. “Response of Bacterial Cells to Fluctuating Environment.” 2015. Web. 25 Jan 2021.

Vancouver:

Nepal S. Response of Bacterial Cells to Fluctuating Environment. [Internet] [Masters thesis]. University of Arkansas; 2015. [cited 2021 Jan 25]. Available from: https://scholarworks.uark.edu/etd/1404.

Council of Science Editors:

Nepal S. Response of Bacterial Cells to Fluctuating Environment. [Masters Thesis]. University of Arkansas; 2015. Available from: https://scholarworks.uark.edu/etd/1404

Iowa State University

4. Kamrani, Mehdi. Interaction between large deformation plasticity and strain-induced phase transformation at high pressures and large deformations.

Degree: 2020, Iowa State University

URL: https://lib.dr.iastate.edu/etd/17925

► Large plastic deformation of materials result in the ultrafine-grained materials with highly improved properties, like a combination of high ductility and high strength. The high-pressure-torsion… (more)

Subjects/Keywords: diamond anvil cell; high pressure; large deformation; large strain; phase transformation

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

APA (6^th Edition):

Kamrani, M. (2020). Interaction between large deformation plasticity and strain-induced phase transformation at high pressures and large deformations. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/17925

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):

Kamrani, Mehdi. “Interaction between large deformation plasticity and strain-induced phase transformation at high pressures and large deformations.” 2020. Thesis, Iowa State University. Accessed January 25, 2021. https://lib.dr.iastate.edu/etd/17925.

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

MLA Handbook (7^th Edition):

Kamrani, Mehdi. “Interaction between large deformation plasticity and strain-induced phase transformation at high pressures and large deformations.” 2020. Web. 25 Jan 2021.

Vancouver:

Kamrani M. Interaction between large deformation plasticity and strain-induced phase transformation at high pressures and large deformations. [Internet] [Thesis]. Iowa State University; 2020. [cited 2021 Jan 25]. Available from: https://lib.dr.iastate.edu/etd/17925.

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

Council of Science Editors:

Kamrani M. Interaction between large deformation plasticity and strain-induced phase transformation at high pressures and large deformations. [Thesis]. Iowa State University; 2020. Available from: https://lib.dr.iastate.edu/etd/17925

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

Washington State University

5. [No author]. CHEMICAL AND PHYSICAL TRANSFORMATIONS OF SIMPLE MOLECULAR SYSTEMS UNDER EXTREME PRESSURES AND TEMPERATURES .

Degree: 2014, Washington State University

URL: http://hdl.handle.net/2376/5137

► Under sufficient compression molecules behave in exotic ways leading to interesting solid state transformations such as disorder-order transitions, polymerization/ionization, or path dependent metastable phases. These… (more)

▼ Under sufficient compression molecules behave in exotic ways leading to interesting solid state transformations such as disorder-order transitions, polymerization/ionization, or path dependent metastable phases. These transitions are largely kinetic and strain controlled processes well beyond that of thermodynamic constraints or minimum energy configurations. To understand these processes the application of both static and dynamic pressure/temperature regimes with proper in-situ¬ diagnostic techniques are essential. Solidification of hydrogen and deuterium has been studied under dynamic compression using dynamic-diamond anvil cell, time-resolved Raman spectroscopy, and fast micro-photography. Liquid H2 or D2 was found to solidify into a grain boundary free crystal grown from the outer edge of the sample chamber in 1-30 ms depending on the compression rate. The time scale of solidification agrees well with that of the discontinuous Raman shift across the liquid/solid phase boundary. Raman studies of nitrogen were performed to investigate the melting curve and solid-solid phase transitions in the pressure-temperature range of 25 to 103 GPa and 300 to 2000 K. The solid-liquid phase boundary has been probed with time-resolved Raman spectroscopy on ramp heated nitrogen in diamond anvil cell, showing a melting maximum at 73 GPa and 1690 K. The dynamic shear-induced martensitic α→ω phase transition was probed using time-resolved x-ray diffraction. Diffraction patterns were obtained with ms resolution allowing for the analysis of the structural evolution through the phase transition. Under sufficient compressive load the transition onset is delayed from 6.2 to 12.5 GPa however the kinetically inhibited reaction occurs quickly after the onset in ~ 4 GPa. The pressure-induced physical and chemical transformations of tetracyanoethylene were studied in diamond anvil cells with micro-Raman and emission spectroscopy, and synchrotron x-ray diffraction. TCNE undergoes a shear-induced phase transition at 10 GPa and then a chemical change to two-dimensional C=N polymers above 14 GPa. Laser-heating of the C=N polymer above 25 GPa further converts to a theoretically predicted 3D C-N network structure, evident from an emergence of new Raman C-N stretching frequency at 1400 cm-1, strong fluorescence centered at 640 nm, and the visual appearance of a translucent solid. Advisors/Committee Members: Yoo, Choong-Shik (advisor).

Subjects/Keywords: Physical chemistry; crystallization; diamond anvil cell; high pressure; hydrogen; melting; nitrogen

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APA (6^th Edition):

author], [. (2014). CHEMICAL AND PHYSICAL TRANSFORMATIONS OF SIMPLE MOLECULAR SYSTEMS UNDER EXTREME PRESSURES AND TEMPERATURES . (Thesis). Washington State University. Retrieved from http://hdl.handle.net/2376/5137

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):

author], [No. “CHEMICAL AND PHYSICAL TRANSFORMATIONS OF SIMPLE MOLECULAR SYSTEMS UNDER EXTREME PRESSURES AND TEMPERATURES .” 2014. Thesis, Washington State University. Accessed January 25, 2021. http://hdl.handle.net/2376/5137.

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

MLA Handbook (7^th Edition):

author], [No. “CHEMICAL AND PHYSICAL TRANSFORMATIONS OF SIMPLE MOLECULAR SYSTEMS UNDER EXTREME PRESSURES AND TEMPERATURES .” 2014. Web. 25 Jan 2021.

Vancouver:

author] [. CHEMICAL AND PHYSICAL TRANSFORMATIONS OF SIMPLE MOLECULAR SYSTEMS UNDER EXTREME PRESSURES AND TEMPERATURES . [Internet] [Thesis]. Washington State University; 2014. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2376/5137.

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

Council of Science Editors:

author] [. CHEMICAL AND PHYSICAL TRANSFORMATIONS OF SIMPLE MOLECULAR SYSTEMS UNDER EXTREME PRESSURES AND TEMPERATURES . [Thesis]. Washington State University; 2014. Available from: http://hdl.handle.net/2376/5137

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

Florida International University

6. Hadjikhani, Ali. Raman Spectroscopy Study of Graphene Under High Pressure.

Degree: MS, Materials Science and Engineering, 2012, Florida International University

URL: https://digitalcommons.fiu.edu/etd/656 ; 10.25148/etd.FI12071109 ; FI12071109

► Due to its exceptional mechanical and electrical properties, graphene (one layer sheet of carbon atoms) has attracted a lot of attention since its discovery… (more)

Subjects/Keywords: Graphene; High Pressure; DAC; Diamond Anvil Cell; Raman Spectroscopy

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APA (6^th Edition):

Hadjikhani, A. (2012). Raman Spectroscopy Study of Graphene Under High Pressure. (Thesis). Florida International University. Retrieved from https://digitalcommons.fiu.edu/etd/656 ; 10.25148/etd.FI12071109 ; FI12071109

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):

Hadjikhani, Ali. “Raman Spectroscopy Study of Graphene Under High Pressure.” 2012. Thesis, Florida International University. Accessed January 25, 2021. https://digitalcommons.fiu.edu/etd/656 ; 10.25148/etd.FI12071109 ; FI12071109.

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

MLA Handbook (7^th Edition):

Hadjikhani, Ali. “Raman Spectroscopy Study of Graphene Under High Pressure.” 2012. Web. 25 Jan 2021.

Vancouver:

Hadjikhani A. Raman Spectroscopy Study of Graphene Under High Pressure. [Internet] [Thesis]. Florida International University; 2012. [cited 2021 Jan 25]. Available from: https://digitalcommons.fiu.edu/etd/656 ; 10.25148/etd.FI12071109 ; FI12071109.

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

Council of Science Editors:

Hadjikhani A. Raman Spectroscopy Study of Graphene Under High Pressure. [Thesis]. Florida International University; 2012. Available from: https://digitalcommons.fiu.edu/etd/656 ; 10.25148/etd.FI12071109 ; FI12071109

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

University of Edinburgh

7. Capone, Mara. Perovskites under extreme conditions : pushing the limits of neutron diffraction.

Degree: PhD, 2020, University of Edinburgh

URL: http://hdl.handle.net/1842/37162

► The application of hydrostatic pressure and temperature are effective methods for manipulating and correlating crystal structures and physical properties of materials. Volume, interatomic distances, chemical… (more)

▼ The application of hydrostatic pressure and temperature are effective methods for manipulating and correlating crystal structures and physical properties of materials. Volume, interatomic distances, chemical bonds, local atomic coordination are all strongly altered by pressure and temperature, which can either distort or symmetrise the structure and cause the alteration of the crystal symmetry with huge consequences on the physical properties. High Pressure (HP), in particular, can induce significant structural and physical changes and can be used to explore structural-property relationships in a huge variety of materials. Perovskite compounds are excellent candidates for HP investigations owing to remarkable changes in their structural, electrical and magnetic properties in response to a variation of the chemical composition x or volume of the material. Diverse crystal structures and physical properties are found in the perovskite family, which can be controlled by the application of pressure and/or temperature. Among the broad spectrum of experimental techniques, neutron-powder diffraction offers several advantages for in situ investigation under extreme conditions of perovskite materials. Neutron diffraction provides the ability to map the relative positions of atoms and their structural changes down to the nanometre length-scale. The complex dependence of the coherent neutron scattering cross section on the atomic number Z of the scattered material enables diffraction comparison between neighbouring elements in the periodic table and isotopes, and a higher sensitivity to light elements such as hydrogen or oxygen in the presence of heavier atoms. The primary aim of this thesis investigates perovskite oxides and focuses on their structural and physical characterisation under the application of hydrostatic pressure and/or temperature. Perovskites exhibit physical properties utilised in several technological fields, from the magnetoresistence of lanthanum manganites, to the catalytic activity of cobalt-based compounds or to the antiferromagnetism of lanthanum ferrite materials. This thesis reports a pressure and temperature-dependent neutron-diffraction study of the lanthanum cobaltite LaCoO3. The present study gives insight into the unique pressure and temperature-dependent electronic properties of LaCoO3 and aims to deepen the understanding of structural-electronic correlations in this material. Neutron-diffraction data were collected at 120, 290 and 480 K in the 0-6 GPa pressure range and used to report the equation of state of the sample at each temperature and to accurately determine chemical bonds and structural parameters. A similar investigation reports details of the structural and physical properties of the lanthanum ferrite LaFeO3 material. Neutron-diffraction data were collected at 110 and 290 K in the 0-6.5 GPa and 0-16.2 GPa ranges, respectively. This work analyses the equation of state of the sample and changes within its structure under extreme conditions. This study also monitors the magnetic…

Subjects/Keywords: high pressure; neutron diffraction; Perovskite; diamond anvil cell

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

APA (6^th Edition):

Capone, M. (2020). Perovskites under extreme conditions : pushing the limits of neutron diffraction. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/37162

Chicago Manual of Style (16^th Edition):

Capone, Mara. “Perovskites under extreme conditions : pushing the limits of neutron diffraction.” 2020. Doctoral Dissertation, University of Edinburgh. Accessed January 25, 2021. http://hdl.handle.net/1842/37162.

MLA Handbook (7^th Edition):

Capone, Mara. “Perovskites under extreme conditions : pushing the limits of neutron diffraction.” 2020. Web. 25 Jan 2021.

Vancouver:

Capone M. Perovskites under extreme conditions : pushing the limits of neutron diffraction. [Internet] [Doctoral dissertation]. University of Edinburgh; 2020. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/1842/37162.

Council of Science Editors:

Capone M. Perovskites under extreme conditions : pushing the limits of neutron diffraction. [Doctoral Dissertation]. University of Edinburgh; 2020. Available from: http://hdl.handle.net/1842/37162

University of Edinburgh

8. Capone, Mara. Perovskites under extreme conditions : pushing the limits of neutron diffraction.

Degree: PhD, 2020, University of Edinburgh

URL: https://doi.org/10.7488/era/463 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.810215

► The application of hydrostatic pressure and temperature are effective methods for manipulating and correlating crystal structures and physical properties of materials. Volume, interatomic distances, chemical… (more)

▼ The application of hydrostatic pressure and temperature are effective methods for manipulating and correlating crystal structures and physical properties of materials. Volume, interatomic distances, chemical bonds, local atomic coordination are all strongly altered by pressure and temperature, which can either distort or symmetrise the structure and cause the alteration of the crystal symmetry with huge consequences on the physical properties. High Pressure (HP), in particular, can induce significant structural and physical changes and can be used to explore structural-property relationships in a huge variety of materials. Perovskite compounds are excellent candidates for HP investigations owing to remarkable changes in their structural, electrical and magnetic properties in response to a variation of the chemical composition x or volume of the material. Diverse crystal structures and physical properties are found in the perovskite family, which can be controlled by the application of pressure and/or temperature. Among the broad spectrum of experimental techniques, neutron-powder diffraction offers several advantages for in situ investigation under extreme conditions of perovskite materials. Neutron diffraction provides the ability to map the relative positions of atoms and their structural changes down to the nanometre length-scale. The complex dependence of the coherent neutron scattering cross section on the atomic number Z of the scattered material enables diffraction comparison between neighbouring elements in the periodic table and isotopes, and a higher sensitivity to light elements such as hydrogen or oxygen in the presence of heavier atoms. The primary aim of this thesis investigates perovskite oxides and focuses on their structural and physical characterisation under the application of hydrostatic pressure and/or temperature. Perovskites exhibit physical properties utilised in several technological fields, from the magnetoresistence of lanthanum manganites, to the catalytic activity of cobalt-based compounds or to the antiferromagnetism of lanthanum ferrite materials. This thesis reports a pressure and temperature-dependent neutron-diffraction study of the lanthanum cobaltite LaCoO3. The present study gives insight into the unique pressure and temperature-dependent electronic properties of LaCoO3 and aims to deepen the understanding of structural-electronic correlations in this material. Neutron-diffraction data were collected at 120, 290 and 480 K in the 0-6 GPa pressure range and used to report the equation of state of the sample at each temperature and to accurately determine chemical bonds and structural parameters. A similar investigation reports details of the structural and physical properties of the lanthanum ferrite LaFeO3 material. Neutron-diffraction data were collected at 110 and 290 K in the 0-6.5 GPa and 0-16.2 GPa ranges, respectively. This work analyses the equation of state of the sample and changes within its structure under extreme conditions. This study also monitors the magnetic…

Subjects/Keywords: high pressure; neutron diffraction; Perovskite; diamond anvil cell

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

APA (6^th Edition):

Capone, M. (2020). Perovskites under extreme conditions : pushing the limits of neutron diffraction. (Doctoral Dissertation). University of Edinburgh. Retrieved from https://doi.org/10.7488/era/463 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.810215

Chicago Manual of Style (16^th Edition):

Capone, Mara. “Perovskites under extreme conditions : pushing the limits of neutron diffraction.” 2020. Doctoral Dissertation, University of Edinburgh. Accessed January 25, 2021. https://doi.org/10.7488/era/463 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.810215.

MLA Handbook (7^th Edition):

Capone, Mara. “Perovskites under extreme conditions : pushing the limits of neutron diffraction.” 2020. Web. 25 Jan 2021.

Vancouver:

Capone M. Perovskites under extreme conditions : pushing the limits of neutron diffraction. [Internet] [Doctoral dissertation]. University of Edinburgh; 2020. [cited 2021 Jan 25]. Available from: https://doi.org/10.7488/era/463 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.810215.

Council of Science Editors:

Capone M. Perovskites under extreme conditions : pushing the limits of neutron diffraction. [Doctoral Dissertation]. University of Edinburgh; 2020. Available from: https://doi.org/10.7488/era/463 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.810215

The Ohio State University

9. Pigott, Jeff S. The Viscosity of Water at High Pressures and High Temperatures: A Random Walk through a Subduction Zone.

Degree: MS, Geological Sciences, 2011, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1299607953

► The viscosity of water is a first-order constraint on the transport of material from a subducting plate to the mantle wedge. The viscosity of fluids… (more)

Subjects/Keywords: Geophysics; Viscosity; High Pressure; Water; Diamond Anvil Cell; Subduction Zones; Brownian Motion; High Temperature

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

APA (6^th Edition):

Pigott, J. S. (2011). The Viscosity of Water at High Pressures and High Temperatures: A Random Walk through a Subduction Zone. (Masters Thesis). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1299607953

Chicago Manual of Style (16^th Edition):

Pigott, Jeff S. “The Viscosity of Water at High Pressures and High Temperatures: A Random Walk through a Subduction Zone.” 2011. Masters Thesis, The Ohio State University. Accessed January 25, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1299607953.

MLA Handbook (7^th Edition):

Pigott, Jeff S. “The Viscosity of Water at High Pressures and High Temperatures: A Random Walk through a Subduction Zone.” 2011. Web. 25 Jan 2021.

Vancouver:

Pigott JS. The Viscosity of Water at High Pressures and High Temperatures: A Random Walk through a Subduction Zone. [Internet] [Masters thesis]. The Ohio State University; 2011. [cited 2021 Jan 25]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1299607953.

Council of Science Editors:

Pigott JS. The Viscosity of Water at High Pressures and High Temperatures: A Random Walk through a Subduction Zone. [Masters Thesis]. The Ohio State University; 2011. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1299607953

University of Toronto

10. Guzman, Igor. Redox Potential Measurements of Aqueous Systems at High Temperature and High Pressure.

Degree: PhD, 2018, University of Toronto

URL: http://hdl.handle.net/1807/101630

►

Redox potential is an essential variable for characterizing aqueous systems. Its measurement can be beneficial in providing insight into hydrometallurgical processes. An Ir electrode was… (more)

▼

Redox potential is an essential variable for characterizing aqueous systems. Its measurement can be beneficial in providing insight into hydrometallurgical processes. An Ir electrode was validated for redox potential measurements at high temperature and high pressure. Measurements were performed using two different flow-through electrochemical cells (FTEC): one with a Ag/AgCl flow-through external pressure balance reference electrode (FTEPBRE), and the second one was a linear FTEC with an Ir quasi-reference electrode. The potential was measured for the H2SO4-FeSO4-Fe2(SO4)3-H2O system for concentrations of 1 M H2SO4, 10-2 M Fe(III), and 10-4–10-2 M Fe(II) at 34 MPa, up to 200 °C, and, for the linear FTEC, at flow rates of 0.2–1.5 mL/min. The change in potential measured with the Ir electrode behaved according to the Nernst equation upon changes in the test solution, and were consistent with the corresponding estimated potential variation predicted by the Aqueous model from the OLI® System software. The Ir working electrode combined with the Ir quasi-reference electrode were fit into a 2 L autoclave to measure the solution potential during pressure oxidation (POX) of two sulfide materials, pyrite and a refractory gold ore, at 200–230 °C, 345–760 kPa O2 overpressure, and, for the refractory ore, 10–30 wt-%, conditions found in the industry. The measured potentials were related to the ratio [Fe(III)]/[Fe(II)], indicating that the mixed potential in solution is dictated by the Nernst potential of the Fe3+/Fe2+ half reaction. An acidic solution is necessary to sustain soluble iron and therefore accomplish meaningful potential measurements; the Ir electrode operated properly at concentrations 0.3–100 mM for Fe(II) and Fe(III). The measured potential, together with the oxygen consumption during POX of the refractory ore, were used to identify the moment when maximum conversion of sulfide material was achieved. Most POX processes operate at conditions that allows the implementation of the developed sensor and the measured potentials could be used to optimize these processes.

2020-07-10 00:00:00

Advisors/Committee Members: Papangelakis, Vladimiros G, Thorpe, Steven J, Chemical Engineering Applied Chemistry.

Subjects/Keywords: aqueous solution; flow-through electrochemical cell; High temperature / high pressure; Ir electrode; pressure oxidation leaching; Redox potential; 0542

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

APA (6^th Edition):

Guzman, I. (2018). Redox Potential Measurements of Aqueous Systems at High Temperature and High Pressure. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/101630

Chicago Manual of Style (16^th Edition):

Guzman, Igor. “Redox Potential Measurements of Aqueous Systems at High Temperature and High Pressure.” 2018. Doctoral Dissertation, University of Toronto. Accessed January 25, 2021. http://hdl.handle.net/1807/101630.

MLA Handbook (7^th Edition):

Guzman, Igor. “Redox Potential Measurements of Aqueous Systems at High Temperature and High Pressure.” 2018. Web. 25 Jan 2021.

Vancouver:

Guzman I. Redox Potential Measurements of Aqueous Systems at High Temperature and High Pressure. [Internet] [Doctoral dissertation]. University of Toronto; 2018. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/1807/101630.

Council of Science Editors:

Guzman I. Redox Potential Measurements of Aqueous Systems at High Temperature and High Pressure. [Doctoral Dissertation]. University of Toronto; 2018. Available from: http://hdl.handle.net/1807/101630

University of Texas – Austin

11. -2395-7588. Optoelectronic, structural, and topological properties of van der Waals layered materials under extreme conditions.

Degree: PhD, Electrical and Computer Engineering, 2018, University of Texas – Austin

URL: http://hdl.handle.net/2152/71474

► The concept of Internet of Things (IoT) has been discussed extensively in the recent years, where billions of smart devices and sensors communicate with each… (more)

▼ The concept of Internet of Things (IoT) has been discussed extensively in the recent years, where billions of smart devices and sensors communicate with each other and provide ubiquitous service. Two-dimensional (2D) materials for such application could be exposed to extreme conditions that IoT devices may experience, such as mechanically stressing, chemically reactive, high-temperature, and/or radiative environment. Therefore, it is crucial to understand the materials' properties under extreme conditions, and further engineer the properties from the acquired knowledge. In this dissertation, we focus on the effects of oxygen/moisture condition on air-sensitive 2D materials, and effects of hydrostatic pressure on 2D and other layered materials. In Chapter 2, we report detailed study on air-degradation of few-layer phosphorene films and field effect transistors, as well as an effective encapsulation method that enhances the stability of devices up to several months. In the later parts we explore the effects of hydrostatic pressure on layered materials, where the anisotropic van der Waals structure exhibit remarkably large pressure-modulation of material properties. In Chapter 3, pressure effects on Raman modes in bulk Mo₀.₅W₀.₅S₂ alloy are examined to discover strengthening of inter-layer interactions under pressure. In Chapter 4, pressure-induced structural transition of bulk WTe₂ is discussed, where layer sliding introduces inversion symmetry, similar to the case in monolayer WTe₂. In Chapter 5, evolution of optical band gaps of monolayer WS₂ and Mo₀.₅W₀.₅S₂ are studied, where we show different pressure-behaviors of band edges according to the composition. In Chapter 6, structural, vibrational, and topological electronic properties of Bi₁.₅Sb₀.₅Te₁.₈Se₁.₂ topological insulator alloy is explored, to show that the topological states could be modulated by pressure, without transitions in the crystal structure. Advisors/Committee Members: Akinwande, Deji (advisor), Lin, Jung-Fu (advisor), Banerjee, Sanjay K (committee member), Dodabalapur, Ananth (committee member), Wang, Yaguo (committee member).

Subjects/Keywords: 2D materials; Nanomaterials; Topological insulator; High-pressure; Strain engineering; Pressure engineering; Diamond anvil cell; Air-stability

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APA (6^th Edition):

-2395-7588. (2018). Optoelectronic, structural, and topological properties of van der Waals layered materials under extreme conditions. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/71474

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16^th Edition):

-2395-7588. “Optoelectronic, structural, and topological properties of van der Waals layered materials under extreme conditions.” 2018. Doctoral Dissertation, University of Texas – Austin. Accessed January 25, 2021. http://hdl.handle.net/2152/71474.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7^th Edition):

-2395-7588. “Optoelectronic, structural, and topological properties of van der Waals layered materials under extreme conditions.” 2018. Web. 25 Jan 2021.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

-2395-7588. Optoelectronic, structural, and topological properties of van der Waals layered materials under extreme conditions. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2018. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2152/71474.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

-2395-7588. Optoelectronic, structural, and topological properties of van der Waals layered materials under extreme conditions. [Doctoral Dissertation]. University of Texas – Austin; 2018. Available from: http://hdl.handle.net/2152/71474

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

University of California – Berkeley

12. Lutker, Katie M. High Pressure Behavior of Nanomaterials.

Degree: Chemistry, 2013, University of California – Berkeley

URL: http://www.escholarship.org/uc/item/5qh9s8h5

► The investigation of the properties of matter under high pressure is becoming increasing important to many scientific fields, including chemistry, physics, and biology. From a… (more)

▼ The investigation of the properties of matter under high pressure is becoming increasing important to many scientific fields, including chemistry, physics, and biology. From a fundamental standpoint, the application of high pressure allows one to investigate the effect of volume on the properties of a material. It also allows for the examination of the conversion of one phase of matter to another, whether through the crystallization of a material under high pressure, or the transformation of a solid from one crystal structure to another. This dissertation explores the properties of nanoscale materials under high pressure. The size dependence for solid-solid phase transitions in II-VI nanocrystals under high pressure has been previously investigated. Nanoparticles represent an important size regime where the surface atoms make up a significant percentage of the total atoms in the crystal. This leads to the surface playing a larger role in the thermodynamics of the phase transition in these nanocrystals. The first part of this dissertation examines the effect of small changes in the structure of the nanomaterial on its high pressure behavior. By changing the surface of cadmium selenide nanocrystals through the introduction of a zinc sulfide shell, it was determined that the phase transition could be tuned for shell thicknesses below the critical thickness. In addition to structural phase transitions in this core/shell system, the optical properties under high pressure were also investigated. The fluorescence of the core/shell particles splits into multiple peaks due to a breaking of the crystal symmetry and spin exchange in the excitons under pressure. This theme was continued through the investigation of bismuth selenide nanoribbons with and without copper intercalated into the lattice. Bismuth selenide has been found to be a topological insulator, while copper bismuth selenide is a superconductor. The phase transition from the layered rhombohedral structure to the monoclinic phase in bismuth selenide nanomaterials could be pushed to higher pressures through the intercalation of copper in the van der Waals gap between the crystal layers. The dissertation continues by exploring the mechanism of the wurtzite to rocksalt phase transition in cadmium sulfide nanocrystals on ultrafast timescales. A shock wave was initiated through the sample using a laser and the phase transition was probed using an ultrafast X-ray probe pulse. This allowed for the collection of the necessary structural data from the diffraction patterns at different time delays. A h-MgO type intermediate was found to be present under lower shock stresses, but it was not observed at higher shock stresses. This indicates that multiple phase transition pathways are simultaneously occurring in the sample. Steps towards achieving the ability to image the fluorescence of single semiconductor nanoparticles under high pressure are discussed. At a single particle level new phenomena have been observed due to the inherent…

Subjects/Keywords: Physical chemistry; Chemistry; Materials Science; diamond anvil cell; High pressure; nanocrystal; semiconductor

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APA (6^th Edition):

Lutker, K. M. (2013). High Pressure Behavior of Nanomaterials. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/5qh9s8h5

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):

Lutker, Katie M. “High Pressure Behavior of Nanomaterials.” 2013. Thesis, University of California – Berkeley. Accessed January 25, 2021. http://www.escholarship.org/uc/item/5qh9s8h5.

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

MLA Handbook (7^th Edition):

Lutker, Katie M. “High Pressure Behavior of Nanomaterials.” 2013. Web. 25 Jan 2021.

Vancouver:

Lutker KM. High Pressure Behavior of Nanomaterials. [Internet] [Thesis]. University of California – Berkeley; 2013. [cited 2021 Jan 25]. Available from: http://www.escholarship.org/uc/item/5qh9s8h5.

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

Council of Science Editors:

Lutker KM. High Pressure Behavior of Nanomaterials. [Thesis]. University of California – Berkeley; 2013. Available from: http://www.escholarship.org/uc/item/5qh9s8h5

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

University of California – Riverside

13. Jezowski, Sebastian Ryszard. Dynamic High Pressure Study of Chemistry and Physics of Molecular Materials.

Degree: Chemistry, 2013, University of California – Riverside

URL: http://www.escholarship.org/uc/item/61t6j36v

► Both temperature and pressure control and influence the packing of molecules in crystalline phases. Our molecular simulations indicate that at ambient pressure, the cubic polymorph… (more)

▼ Both temperature and pressure control and influence the packing of molecules in crystalline phases. Our molecular simulations indicate that at ambient pressure, the cubic polymorph of tetracyanoethylene, TCNE, is the energetically stable form up to ~ 160 K. The observed transition from the cubic to the monoclinic polymorph occurs however only at temperatures above ~ 318 K due to the large transition barrier. The temperature-induced phase transition in TCNE studied with high-resolution IR spectroscopy is explained in terms of the increased vibrational entropy in the crystals of the monoclinic polymorph.Based upon the inverted design of the Merril-Bassett Diamond Anvil Cell, an improved, second generation dynamic Diamond Anvil Cell was developed. Based on the fluorescence of ruby crystals, we were able to demonstrate that the pressure variation range can be further increased at least up to 7 kbar and that the dynamic pressure compression of up to 1400 GPa/s can be achieved. A new class of mechanophoric system, bis-anthracene, BA, and its photoisomer, PI, is shown to respond reversibly to a mild, static pressure induced by a Diamond Anvil Cell as well as to shear deformation based on absorption spectroscopic measurements. The forward reaction occurs upon illumination with light while the back-reaction may be accelerated upon heating or mechanical stress, coupled to a rehybridization on four equivalent carbon atoms. It is an intriguing result as high pressure stabilizes the photodimerized species in related systems. Our molecular volume simulations ruled out significant differences in the volumes between bis-anthracene and its photoisomer. Kinetic absorption measurements at several different pressures reveal a negative volume of activation in the exothermic back-reaction at room temperature. Through a series of temperature-dependent kinetic measurements it is shown that the barrier of activation for the back-reaction is reduced by more than an order of magnitude at several kbar pressure. Results are compared to the photoisomer of 9-anthroic anhydride and to the Dewar photoisomer. A two-step model involving the transition state is proposed for the pressure-induced PI-to-BA conversion, explaining the mechanism of the reaction occurring upon the application of homogeneous stress.

Subjects/Keywords: Chemistry; Materials Science; diamond anvil cell; dynamic high pressure; linked anthracenes; mechanochemistry; mechanophore; sebastian jezowski

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

APA (6^th Edition):

Jezowski, S. R. (2013). Dynamic High Pressure Study of Chemistry and Physics of Molecular Materials. (Thesis). University of California – Riverside. Retrieved from http://www.escholarship.org/uc/item/61t6j36v

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):

Jezowski, Sebastian Ryszard. “Dynamic High Pressure Study of Chemistry and Physics of Molecular Materials.” 2013. Thesis, University of California – Riverside. Accessed January 25, 2021. http://www.escholarship.org/uc/item/61t6j36v.

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

MLA Handbook (7^th Edition):

Jezowski, Sebastian Ryszard. “Dynamic High Pressure Study of Chemistry and Physics of Molecular Materials.” 2013. Web. 25 Jan 2021.

Vancouver:

Jezowski SR. Dynamic High Pressure Study of Chemistry and Physics of Molecular Materials. [Internet] [Thesis]. University of California – Riverside; 2013. [cited 2021 Jan 25]. Available from: http://www.escholarship.org/uc/item/61t6j36v.

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

Council of Science Editors:

Jezowski SR. Dynamic High Pressure Study of Chemistry and Physics of Molecular Materials. [Thesis]. University of California – Riverside; 2013. Available from: http://www.escholarship.org/uc/item/61t6j36v

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

UCLA

14. Xie, Miao. High Pressure Studies of Incompressible, Superhard Metal Borides.

Degree: Chemistry, 2013, UCLA

URL: http://www.escholarship.org/uc/item/6f20q45v

► Superhard, ultra-incompressible transition-metal borides are exciting candidate materials for applications in cutting, forming, grinding, polishing and wear-protecting coatings. The existence of a network of directional,… (more)

▼ Superhard, ultra-incompressible transition-metal borides are exciting candidate materials for applications in cutting, forming, grinding, polishing and wear-protecting coatings. The existence of a network of directional, covalent bonds, together with a high electron density has been suggested as the key to their remarkable mechanical properties. The goal of this work is to examine how variations in bonding changes the mechanical properties of transition-metal borides. To achieve this, high-pressure diamond anvil cell (DAC) techniques are used to correlate mechanical properties with the electronic and atomic structure of these materials in an effort to understand their intrinsic hardness.This work is divided into two parts: the first uses high-pressure Raman spectroscopy to probe the microscopic bonding structure of rhenium diboride (ReB2), one of the hardest transition-metal boride; the second investigates both elastic and plastic deformations in the inexpensive but still superhard material tungsten tetraboride (WB4) and its solid solutions using synchrotron-based in situ high-pressure X-ray diffractions.In the first part, we aim to gain an understanding of the correlation between microscopic bonding and macroscopic properties of superhard ReB2. Pressure-dependent Raman spectroscopy and DFT calculations are used to explore lattice vibrations in ReB2. We interpret the results in terms of bond directionality and stiffness to connect hardness with bond character. In the second part, we focus on a less expensive boride, WB4 and its solid solutions, using in situ high-pressure diffraction techniques. Two types of measurements are described. First, axial X-ray diffraction, where the X-ray beam is parallel to the compression direction and the sample is compressed hydrostatically; second, radial X-ray diffraction, where the incoming X-ray beam is perpendicular to the compression direction and the sample is confined under non-hydrostatic stress. By combining axial- and radial-diffraction measurements, we explore how the atomic network in metal borides evolves elastically and plastically under hydrostatic and non-hydrostatic pressures. With this information, we can understand how the intrinsic bonding in WB4 produces high hardness. More importantly, we can explore how changes to the electronic and physical structure arising from solid solutions formation can result in the remarkable hardness values observed for many complex WB4 based solid solutions.

Subjects/Keywords: Chemistry; Physical chemistry; Materials Science; Borides; Diamond Anvil Cell; High Pressure; Superhard Material

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APA (6^th Edition):

Xie, M. (2013). High Pressure Studies of Incompressible, Superhard Metal Borides. (Thesis). UCLA. Retrieved from http://www.escholarship.org/uc/item/6f20q45v

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):

Xie, Miao. “High Pressure Studies of Incompressible, Superhard Metal Borides.” 2013. Thesis, UCLA. Accessed January 25, 2021. http://www.escholarship.org/uc/item/6f20q45v.

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

MLA Handbook (7^th Edition):

Xie, Miao. “High Pressure Studies of Incompressible, Superhard Metal Borides.” 2013. Web. 25 Jan 2021.

Vancouver:

Xie M. High Pressure Studies of Incompressible, Superhard Metal Borides. [Internet] [Thesis]. UCLA; 2013. [cited 2021 Jan 25]. Available from: http://www.escholarship.org/uc/item/6f20q45v.

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

Council of Science Editors:

Xie M. High Pressure Studies of Incompressible, Superhard Metal Borides. [Thesis]. UCLA; 2013. Available from: http://www.escholarship.org/uc/item/6f20q45v

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

Florida International University

15. Najiba, Shah. High Pressure and Low Temperature Study of Ammonia Borane and Lithium Amidoborane.

Degree: PhD, Materials Science and Engineering, 2014, Florida International University

URL: https://digitalcommons.fiu.edu/etd/1388 ; 10.25148/etd.FI14040899 ; FI14040899

► Hydrogen has been considered as a potentially efficient and environmentally friendly alternative energy solution. However, one of the most important scientific and technical challenges… (more)

Subjects/Keywords: High pressure; Low temperature; Hydrogen storage; Diamond anvil cell; Other Materials Science and Engineering

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APA (6^th Edition):

Najiba, S. (2014). High Pressure and Low Temperature Study of Ammonia Borane and Lithium Amidoborane. (Doctoral Dissertation). Florida International University. Retrieved from https://digitalcommons.fiu.edu/etd/1388 ; 10.25148/etd.FI14040899 ; FI14040899

Chicago Manual of Style (16^th Edition):

Najiba, Shah. “High Pressure and Low Temperature Study of Ammonia Borane and Lithium Amidoborane.” 2014. Doctoral Dissertation, Florida International University. Accessed January 25, 2021. https://digitalcommons.fiu.edu/etd/1388 ; 10.25148/etd.FI14040899 ; FI14040899.

MLA Handbook (7^th Edition):

Najiba, Shah. “High Pressure and Low Temperature Study of Ammonia Borane and Lithium Amidoborane.” 2014. Web. 25 Jan 2021.

Vancouver:

Najiba S. High Pressure and Low Temperature Study of Ammonia Borane and Lithium Amidoborane. [Internet] [Doctoral dissertation]. Florida International University; 2014. [cited 2021 Jan 25]. Available from: https://digitalcommons.fiu.edu/etd/1388 ; 10.25148/etd.FI14040899 ; FI14040899.

Council of Science Editors:

Najiba S. High Pressure and Low Temperature Study of Ammonia Borane and Lithium Amidoborane. [Doctoral Dissertation]. Florida International University; 2014. Available from: https://digitalcommons.fiu.edu/etd/1388 ; 10.25148/etd.FI14040899 ; FI14040899

Iowa State University

16. Kim, Stella. Pressure effects on selected correlated electron systems.

Degree: 2013, Iowa State University

URL: https://lib.dr.iastate.edu/etd/13080

► This thesis summarizes experimental work using high pressure for materials synthesis and also as a tuning parameter in the study of selected correlated electron systems… (more)

Subjects/Keywords: Bridgman Anvil Cell; Correlated electrons; Heavy fermions; High pressure; Quantum criticality; Superconductivity; Condensed Matter Physics

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APA (6^th Edition):

Kim, S. (2013). Pressure effects on selected correlated electron systems. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/13080

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):

Kim, Stella. “Pressure effects on selected correlated electron systems.” 2013. Thesis, Iowa State University. Accessed January 25, 2021. https://lib.dr.iastate.edu/etd/13080.

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

MLA Handbook (7^th Edition):

Kim, Stella. “Pressure effects on selected correlated electron systems.” 2013. Web. 25 Jan 2021.

Vancouver:

Kim S. Pressure effects on selected correlated electron systems. [Internet] [Thesis]. Iowa State University; 2013. [cited 2021 Jan 25]. Available from: https://lib.dr.iastate.edu/etd/13080.

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

Council of Science Editors:

Kim S. Pressure effects on selected correlated electron systems. [Thesis]. Iowa State University; 2013. Available from: https://lib.dr.iastate.edu/etd/13080

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

University of Toronto

17. Tian, Di. Pressure Induced Quantum Phase Transitions.

Degree: PhD, 2017, University of Toronto

URL: http://hdl.handle.net/1807/93046

►

Quantum phase transitions are among the most intriguing topics in modern condensed matter physics. Interesting physical phenomena usually emerge in the vicinity of quantum critical… (more)

▼

Quantum phase transitions are among the most intriguing topics in modern condensed matter physics. Interesting physical phenomena usually emerge in the vicinity of quantum critical points, making the investigation of such quantum systems particularly rewarding. In this thesis we present studies related to quantum phase transitions in two compounds, FBBO and Sr3Ru2O7, using hydrostatic pressure as the tuning parameter. Pressure is an ideal parameter to tune the strength of various interactions within the sample by changing the lattice constants, but is known to be very challenging to apply experimentally. Therefore a major effort of my PhD is to find out a consistent and systematic approach to prepare such experiments. FBBO is a neutral organic radical that has been carefully designed to be as metallic as possible at ambient pressure. Nevertheless it is still insulating, and high pressure was required in order to drive this system through the metal-insulator transition. Here, I present strong evidence of the formation of a Fermi liquid ground state under 6.2 GPa [1]. This is the first such observation for a neutral organic radical, after being proposed for decades. In the approach to metallization, we also found intriguing evidence of a low temperature magnetic phase. The c-axis resistivity of the itinerant metamagnet Sr3Ru2O7 has also been measured under pressure. The initial goal was to search for superconductivity, largely because of the interesting unconventional superconducting ground state found in its close sibling, Sr214. In particular, the c-axis conductivity was measured to rule out possible Sr2RuO4 inclusions within the sample. No superconductivity was found up to the highest pressures of 5.8 GPa and 4.7 GPa respectively in the two independent sets of measurements. Instead, we found that the high temperature resistance falls substantially with increasing pressure, unlike what has been reported for Sr214. The metamagnetic transition shifts rapidly with pressure to higher magnetic field. More importantly, power-law analysis at low temperatures at various pressures indicates that the strength of the electron-electron interaction decays rapidly with increasing pressure. This offers a natural explanation for our failure to induce superconductivity at high pressures.

2018-12-19 00:00:00

Advisors/Committee Members: Julian, Stephen R, Physics.

Subjects/Keywords: Anvil cell; High pressure; Metal insulator transition; Quantum phase transition; Superconductivity; 0605

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APA (6^th Edition):

Tian, D. (2017). Pressure Induced Quantum Phase Transitions. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/93046

Chicago Manual of Style (16^th Edition):

Tian, Di. “Pressure Induced Quantum Phase Transitions.” 2017. Doctoral Dissertation, University of Toronto. Accessed January 25, 2021. http://hdl.handle.net/1807/93046.

MLA Handbook (7^th Edition):

Tian, Di. “Pressure Induced Quantum Phase Transitions.” 2017. Web. 25 Jan 2021.

Vancouver:

Tian D. Pressure Induced Quantum Phase Transitions. [Internet] [Doctoral dissertation]. University of Toronto; 2017. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/1807/93046.

Council of Science Editors:

Tian D. Pressure Induced Quantum Phase Transitions. [Doctoral Dissertation]. University of Toronto; 2017. Available from: http://hdl.handle.net/1807/93046

University of Illinois – Urbana-Champaign

18. Fu, Yuanxi. High pressure surface enhanced Raman scattering spectroscopy.

Degree: PhD, Chemistry, 2015, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/78588

► Surface-enhanced Raman scattering spectroscopy (SERS) was combined with the diamond anvil cell technique to study molecular monolayers and single molecules under high pressure. Vibrational spectra… (more)

Subjects/Keywords: single-molecule spectroscopy; diamond anvil cell; surface enhanced Raman scattering spectroscopy; High pressure

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APA (6^th Edition):

Fu, Y. (2015). High pressure surface enhanced Raman scattering spectroscopy. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/78588

Chicago Manual of Style (16^th Edition):

Fu, Yuanxi. “High pressure surface enhanced Raman scattering spectroscopy.” 2015. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed January 25, 2021. http://hdl.handle.net/2142/78588.

MLA Handbook (7^th Edition):

Fu, Yuanxi. “High pressure surface enhanced Raman scattering spectroscopy.” 2015. Web. 25 Jan 2021.

Vancouver:

Fu Y. High pressure surface enhanced Raman scattering spectroscopy. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2015. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2142/78588.

Council of Science Editors:

Fu Y. High pressure surface enhanced Raman scattering spectroscopy. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2015. Available from: http://hdl.handle.net/2142/78588

Florida International University

19. Hrubiak, Rostislav. Exploring Thermal and Mechanical Properties of Selected Transition Elements under Extreme Conditions: Experiments at High Pressures and High Temperatures.

Degree: PhD, Materials Science and Engineering, 2012, Florida International University

URL: https://digitalcommons.fiu.edu/etd/696 ; 10.25148/etd.FI12080619 ; FI12080619

► Transition metals (Ti, Zr, Hf, Mo, W, V, Nb, Ta, Pd, Pt, Cu, Ag, and Au) are essential building units of many materials and… (more)

Subjects/Keywords: transition metals; titanium; zirconium; hafnium; high pressure; high temperature; equation of state; phase diagram; thermal conductivity; diamond anvil cell; laser

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APA (6^th Edition):

Hrubiak, R. (2012). Exploring Thermal and Mechanical Properties of Selected Transition Elements under Extreme Conditions: Experiments at High Pressures and High Temperatures. (Doctoral Dissertation). Florida International University. Retrieved from https://digitalcommons.fiu.edu/etd/696 ; 10.25148/etd.FI12080619 ; FI12080619

Chicago Manual of Style (16^th Edition):

Hrubiak, Rostislav. “Exploring Thermal and Mechanical Properties of Selected Transition Elements under Extreme Conditions: Experiments at High Pressures and High Temperatures.” 2012. Doctoral Dissertation, Florida International University. Accessed January 25, 2021. https://digitalcommons.fiu.edu/etd/696 ; 10.25148/etd.FI12080619 ; FI12080619.

MLA Handbook (7^th Edition):

Hrubiak, Rostislav. “Exploring Thermal and Mechanical Properties of Selected Transition Elements under Extreme Conditions: Experiments at High Pressures and High Temperatures.” 2012. Web. 25 Jan 2021.

Vancouver:

Hrubiak R. Exploring Thermal and Mechanical Properties of Selected Transition Elements under Extreme Conditions: Experiments at High Pressures and High Temperatures. [Internet] [Doctoral dissertation]. Florida International University; 2012. [cited 2021 Jan 25]. Available from: https://digitalcommons.fiu.edu/etd/696 ; 10.25148/etd.FI12080619 ; FI12080619.

Council of Science Editors:

Hrubiak R. Exploring Thermal and Mechanical Properties of Selected Transition Elements under Extreme Conditions: Experiments at High Pressures and High Temperatures. [Doctoral Dissertation]. Florida International University; 2012. Available from: https://digitalcommons.fiu.edu/etd/696 ; 10.25148/etd.FI12080619 ; FI12080619

University of Akron

20. Begen, Burak. INFLUENCE OF PRESSURE ON FAST DYNAMICS IN POLYMERS.

Degree: PhD, Polymer Science, 2007, University of Akron

URL: http://rave.ohiolink.edu/etdc/view?acc_num=akron1195437587

► One of the biggest challenges in solid state physics today is understanding the nature of the glass transition. Dynamic studies are critical in solving some… (more)

▼ One of the biggest challenges in solid state physics today is understanding the nature of the glass transition. Dynamic studies are critical in solving some of the problems in the field. Until recently, investigations of dynamics in glass formers were mostly carried out as a function of temperature. However, with the advancements in experimental techniques and methods, the interest towards using pressure as an additional experimental variable increased. The advantages of pressure over temperature are two-fold: First, it only alters the density of the system, whereas temperature changes both the thermal energy and the density, and secondly, one can achieve significant density changes (~20%) with pressure, whereas temperature creates smaller density changes (~5%). These advantages let researchers make direct comparisons of the results with glass transition models (i.e. free volume ideas). The dynamics in the frequency range between 1 GHz and 5 THz (fast dynamics), are thought to have a crucial role. Crystals in this frequency range have a Debye-like density of vibrational states. Glasses, however, have two extra contributions when compared to crystalline structures: (i) an anharmonic relaxation-like contribution that appears as a quasielastic scattering (QES) and (ii) a harmonic vibrational contribution, which shows up as the boson peak (BP) in light and neutron scattering spectra. It has also been shown experimentally that fast dynamics in glasses are strongly correlated with the temperature dependence of structural relaxation.In this dissertation the influence of pressure on fast dynamics in polyisobutylene, polyisoprene and low molecular weight polystyrene is investigated using inelastic light, neutron and X-ray scattering techniques. The results are compared to the predictions of the existing models.The results for all polymers studied showed that the boson peak shifts more strongly than sound modes, suggesting that the variations cannot be fully described by the transformation of elastic continuum as has been claimed in a few recent publications. It is also observed that the boson peak intensity decreases significantly under pressure. However, when scaled to the Debye level, the boson peak intensity increases under pressure for all polymers. The analysis of the QES showed a strong decrease of intensity under pressure. These variations strongly correlate with the change in the boson peak intensity under pressure, suggesting a relationship between QES and BP. Advisors/Committee Members: Sokolov, Alexei (Advisor).

Subjects/Keywords: pressure; high pressure; high pressure cell; diamond anvil cell; DAC; polymers; fast dynamics; boson peak; quasielastic scattering

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

APA (6^th Edition):

Begen, B. (2007). INFLUENCE OF PRESSURE ON FAST DYNAMICS IN POLYMERS. (Doctoral Dissertation). University of Akron. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=akron1195437587

Chicago Manual of Style (16^th Edition):

Begen, Burak. “INFLUENCE OF PRESSURE ON FAST DYNAMICS IN POLYMERS.” 2007. Doctoral Dissertation, University of Akron. Accessed January 25, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1195437587.

MLA Handbook (7^th Edition):

Begen, Burak. “INFLUENCE OF PRESSURE ON FAST DYNAMICS IN POLYMERS.” 2007. Web. 25 Jan 2021.

Vancouver:

Begen B. INFLUENCE OF PRESSURE ON FAST DYNAMICS IN POLYMERS. [Internet] [Doctoral dissertation]. University of Akron; 2007. [cited 2021 Jan 25]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1195437587.

Council of Science Editors:

Begen B. INFLUENCE OF PRESSURE ON FAST DYNAMICS IN POLYMERS. [Doctoral Dissertation]. University of Akron; 2007. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1195437587

University of Cambridge

21. Semeniuk, Konstantin. Correlated low temperature states of YFe2Ge2 and pressure metallised NiS2.

Degree: PhD, 2018, University of Cambridge

URL: https://www.repository.cam.ac.uk/handle/1810/274346

► While the free electron model can often be surprisingly successful in describing properties of solids, there are plenty of materials in which interactions between electrons… (more)

▼ While the free electron model can often be surprisingly successful in describing properties of solids, there are plenty of materials in which interactions between electrons are too significant to be neglected. These strongly correlated systems sometimes exhibit rather unexpected, unusual and useful phenomena, understanding of which is one of the aims of condensed matter physics. Heat capacity measurements of paramagnetic YFe₂Ge₂ give a Sommerfeld coefficient of about 100 mJ mol⁻¹ K⁻², which is about an order of magnitude higher than the value predicted by band structure calculations.This suggests the existence of strong electronic correlations in the compound, potentially due to proximity to an antiferromagnetic quantum critical point (QCP). Existence of the latter is also indicated by the non-Fermi liquid T^3/2 behaviour of the low temperature resistivity. Below 1.8 K a superconducting phase develops in the material, making it a rare case of a non-pnictide and non-chalcogenide iron based superconductor with the 1-2-2 structure. This thesis describes growth and study of a new generation of high quality YFe₂Ge₂ samples with residual resistance ratios reaching 200. Measurements of resistivity, heat capacity and magnetic susceptibility confirm the intrinsic and bulk character of the superconductivity, which is also argued to be of an unconventional nature. In order to test the hypothesis of the nearby QCP, resistance measurements under high pressure of up to 35 kbar have been conducted. Pressure dependence of the critical temperature of the superconductivity has been found to be rather weak. μSR measurements have been performed, but provided limited information due to sample inhomogeneity resulting in a broad distribution of the critical temperature. While the superconductivity is the result of an effective attraction between electrons, under different circumstances the electronic properties of a system can instead be dictated by the Coulomb repulsion. This is the case for another transition metal based compound NiS₂, which is a Mott insulator. Applying hydrostatic pressure of about 30 kbar brings the material across the Mott metal-insulator transition (MIT) into the metallic phase. We have used the tunnel diode oscillator (TDO) technique to measure quantum oscillations in the metallised state of NiS₂, making it possible to track the evolution of the principal Fermi surface and the associated effective mass as a function of pressure. New results are presented which access a wider pressure range than previous studies and provide strong evidence that the effective carrier mass diverges close to the Mott MIT, as expected within the Brinkman-Rice scenario and predicted in dynamical mean field theory calculations. Quantum oscillations have been measured at pressures as close to the insulating phase as 33 kbar and as high as 97 kbar. In addition to providing a valuable insight into the mechanism of the Mott MIT, this study has also demonstrated the potential of the TDO technique for…

Subjects/Keywords: YFe2Ge2; NiS2; quantum oscillations; tunnel diode oscillator; TDO; Mott insulator; superconductivity; iron-based superconductors; high pressure; pressure cell; low temperature; high magnetic field; strongly correlated; non-Fermi liquid; Fermi surface; anvil cell; piston-cylinder cell; musr

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

APA (6^th Edition):

Semeniuk, K. (2018). Correlated low temperature states of YFe2Ge2 and pressure metallised NiS2. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/274346

Chicago Manual of Style (16^th Edition):

Semeniuk, Konstantin. “Correlated low temperature states of YFe2Ge2 and pressure metallised NiS2.” 2018. Doctoral Dissertation, University of Cambridge. Accessed January 25, 2021. https://www.repository.cam.ac.uk/handle/1810/274346.

MLA Handbook (7^th Edition):

Semeniuk, Konstantin. “Correlated low temperature states of YFe2Ge2 and pressure metallised NiS2.” 2018. Web. 25 Jan 2021.

Vancouver:

Semeniuk K. Correlated low temperature states of YFe2Ge2 and pressure metallised NiS2. [Internet] [Doctoral dissertation]. University of Cambridge; 2018. [cited 2021 Jan 25]. Available from: https://www.repository.cam.ac.uk/handle/1810/274346.

Council of Science Editors:

Semeniuk K. Correlated low temperature states of YFe2Ge2 and pressure metallised NiS2. [Doctoral Dissertation]. University of Cambridge; 2018. Available from: https://www.repository.cam.ac.uk/handle/1810/274346

22. Semeniuk, Konstantin. Correlated low temperature states of YFe2Ge2 and pressure metallised NiS2.

Degree: PhD, 2018, University of Cambridge

URL: https://doi.org/10.17863/CAM.21468 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744639

► While the free electron model can often be surprisingly successful in describing properties of solids, there are plenty of materials in which interactions between electrons… (more)

▼ While the free electron model can often be surprisingly successful in describing properties of solids, there are plenty of materials in which interactions between electrons are too significant to be neglected. These strongly correlated systems sometimes exhibit rather unexpected, unusual and useful phenomena, understanding of which is one of the aims of condensed matter physics. Heat capacity measurements of paramagnetic YFe₂Ge₂ give a Sommerfeld coefficient of about 100 mJ mol⁻¹ K⁻², which is about an order of magnitude higher than the value predicted by band structure calculations. This suggests the existence of strong electronic correlations in the compound, potentially due to proximity to an antiferromagnetic quantum critical point (QCP). Existence of the latter is also indicated by the non-Fermi liquid T^3/2 behaviour of the low temperature resistivity. Below 1.8 K a superconducting phase develops in the material, making it a rare case of a non-pnictide and non-chalcogenide iron based superconductor with the 1-2-2 structure. This thesis describes growth and study of a new generation of high quality YFe₂Ge₂ samples with residual resistance ratios reaching 200. Measurements of resistivity, heat capacity and magnetic susceptibility confirm the intrinsic and bulk character of the superconductivity, which is also argued to be of an unconventional nature. In order to test the hypothesis of the nearby QCP, resistance measurements under high pressure of up to 35 kbar have been conducted. Pressure dependence of the critical temperature of the superconductivity has been found to be rather weak. μSR measurements have been performed, but provided limited information due to sample inhomogeneity resulting in a broad distribution of the critical temperature. While the superconductivity is the result of an effective attraction between electrons, under different circumstances the electronic properties of a system can instead be dictated by the Coulomb repulsion. This is the case for another transition metal based compound NiS₂, which is a Mott insulator. Applying hydrostatic pressure of about 30 kbar brings the material across the Mott metal-insulator transition (MIT) into the metallic phase. We have used the tunnel diode oscillator (TDO) technique to measure quantum oscillations in the metallised state of NiS₂, making it possible to track the evolution of the principal Fermi surface and the associated effective mass as a function of pressure. New results are presented which access a wider pressure range than previous studies and provide strong evidence that the effective carrier mass diverges close to the Mott MIT, as expected within the Brinkman-Rice scenario and predicted in dynamical mean field theory calculations. Quantum oscillations have been measured at pressures as close to the insulating phase as 33 kbar and as high as 97 kbar. In addition to providing a valuable insight into the mechanism of the Mott MIT, this study has also demonstrated the potential of the TDO technique…

Subjects/Keywords: 537.6; YFe2Ge2; NiS2; quantum oscillations; tunnel diode oscillator; TDO; Mott insulator; superconductivity; iron-based superconductors; high pressure; pressure cell; low temperature; high magnetic field; strongly correlated; non-Fermi liquid; Fermi surface; anvil cell; piston-cylinder cell; musr

10 more images…

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

APA (6^th Edition):

Semeniuk, K. (2018). Correlated low temperature states of YFe2Ge2 and pressure metallised NiS2. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.21468 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744639

Chicago Manual of Style (16^th Edition):

Semeniuk, Konstantin. “Correlated low temperature states of YFe2Ge2 and pressure metallised NiS2.” 2018. Doctoral Dissertation, University of Cambridge. Accessed January 25, 2021. https://doi.org/10.17863/CAM.21468 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744639.

MLA Handbook (7^th Edition):

Semeniuk, Konstantin. “Correlated low temperature states of YFe2Ge2 and pressure metallised NiS2.” 2018. Web. 25 Jan 2021.

Vancouver:

Semeniuk K. Correlated low temperature states of YFe2Ge2 and pressure metallised NiS2. [Internet] [Doctoral dissertation]. University of Cambridge; 2018. [cited 2021 Jan 25]. Available from: https://doi.org/10.17863/CAM.21468 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744639.

Council of Science Editors:

Semeniuk K. Correlated low temperature states of YFe2Ge2 and pressure metallised NiS2. [Doctoral Dissertation]. University of Cambridge; 2018. Available from: https://doi.org/10.17863/CAM.21468 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744639

University of Adelaide

23. Kleinig, Andrew Royce. Cell disruption mechanics / by Andrew Royce Kleinig.

Degree: 1997, University of Adelaide

URL: http://hdl.handle.net/2440/18977

► This thesis examines the cell-fluid interactions that occur during homogenization and combines them with an investigation of the mechanical properties of the cell. This results… (more)

Subjects/Keywords: Cells Mechanical properties.; Cell separation.; High pressure biotechnology.

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APA (6^th Edition):

Kleinig, A. R. (1997). Cell disruption mechanics / by Andrew Royce Kleinig. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/18977

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):

Kleinig, Andrew Royce. “Cell disruption mechanics / by Andrew Royce Kleinig.” 1997. Thesis, University of Adelaide. Accessed January 25, 2021. http://hdl.handle.net/2440/18977.

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

MLA Handbook (7^th Edition):

Kleinig, Andrew Royce. “Cell disruption mechanics / by Andrew Royce Kleinig.” 1997. Web. 25 Jan 2021.

Vancouver:

Kleinig AR. Cell disruption mechanics / by Andrew Royce Kleinig. [Internet] [Thesis]. University of Adelaide; 1997. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/2440/18977.

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

Council of Science Editors:

Kleinig AR. Cell disruption mechanics / by Andrew Royce Kleinig. [Thesis]. University of Adelaide; 1997. Available from: http://hdl.handle.net/2440/18977

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

University of Western Ontario

24. Hu, Yue. In Situ High-Pressure Study of Metal-Organic Frameworks and Their Performance for CO2 Storage Probed by Vibrational Spectroscopy.

Degree: 2015, University of Western Ontario

URL: https://ir.lib.uwo.ca/etd/3090

► Metal-organic frameworks (MOFs) are an important class of porous materials, owing to their potential applications in a variety of areas, including gas storage, molecular separations,… (more)

Subjects/Keywords: Metal-organic frameworks; high pressure; diamond anvil cell; infra-red spectroscopy; Raman spectroscopy; CO2 storage; Inorganic Chemistry; Materials Chemistry; Physical Chemistry

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APA (6^th Edition):

Hu, Y. (2015). In Situ High-Pressure Study of Metal-Organic Frameworks and Their Performance for CO2 Storage Probed by Vibrational Spectroscopy. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/3090

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):

Hu, Yue. “In Situ High-Pressure Study of Metal-Organic Frameworks and Their Performance for CO2 Storage Probed by Vibrational Spectroscopy.” 2015. Thesis, University of Western Ontario. Accessed January 25, 2021. https://ir.lib.uwo.ca/etd/3090.

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

MLA Handbook (7^th Edition):

Hu, Yue. “In Situ High-Pressure Study of Metal-Organic Frameworks and Their Performance for CO2 Storage Probed by Vibrational Spectroscopy.” 2015. Web. 25 Jan 2021.

Vancouver:

Hu Y. In Situ High-Pressure Study of Metal-Organic Frameworks and Their Performance for CO2 Storage Probed by Vibrational Spectroscopy. [Internet] [Thesis]. University of Western Ontario; 2015. [cited 2021 Jan 25]. Available from: https://ir.lib.uwo.ca/etd/3090.

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

Council of Science Editors:

Hu Y. In Situ High-Pressure Study of Metal-Organic Frameworks and Their Performance for CO2 Storage Probed by Vibrational Spectroscopy. [Thesis]. University of Western Ontario; 2015. Available from: https://ir.lib.uwo.ca/etd/3090

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

University of Edinburgh

25. Coleman, Amy Louise. Studies of dynamically and statically compressed antimony.

Degree: PhD, 2018, University of Edinburgh

URL: http://hdl.handle.net/1842/31334

► Physics at extreme conditions is not a young field; there have been decades of developments that have allowed us to generate high-pressure and high-temperature conditions… (more)

▼ Physics at extreme conditions is not a young field; there have been decades of developments that have allowed us to generate high-pressure and high-temperature conditions in a vast array of materials. Conventionally, these extreme conditions were generated using static compression techniques; compressing a material in a diamond anvil cell which could then be heated or cooled, with structural information deduced using synchrotron radiation. These techniques are still invaluable for extreme conditions research although the pressures and temperatures that are accessible to them are limited by the strength of the diamond anvil cells and their ability to withstand extreme temperatures. The necessity for access to pressure-temperature states that are beyond the scope of the conventional diamond anvil cell is driven by the need to characterise extreme environments such as planetary interiors. It was long believed that materials in high pressure-temperature states would exhibit relatively simple, high-symmetry crystal structures, but recent research has proven that, conversely, there is an abundance of complex structural behaviour at these extreme conditions. One means of attaining pressure-temperature states beyond those accessible using static compression techniques is to impart a large amount of energy into a material in a comparatively short period of time (milliseconds to nanoseconds); this is known as dynamic compression. Dynamic compression can be generated using impact techniques or, alternatively, via laser ablation. Access to the most extreme conditions is commonly achieved by generating a shockwave which compresses the sample with the fastest achievable compression wave. Not only does this type of compression facilitate access to the most extreme states, it also allows us to explore the physics of impact phenomena and other such situations involving rapid energy transfer. Dynamic compression occurs on short timescales and, as such, there is a considerable challenge in implementing diagnostics to study the behaviour of compressed materials. Furthermore, because complexity is commonplace in extreme conditions, it is vital that any diagnostics should be able to provide data of high enough quality that this complexity may be resolved. The advent of 4th generation light sources (x-ray free electron lasers) has afforded us the opportunity to obtain extraordinarily high quality data on dynamic compression timescales. In the interest of refining analytical techniques when utilising this novel technology, materials exhibiting complex crystal structures should be investigated. Antimony is an element which is known, under static compression, to transform from a Peierls-distorted rhombohedral phase (R-3m) to an incommensurately modulated host-guest structure (I'4=mcm(00γ)000s), a structure with an incredibly high level of complexity. The complexity of this host-guest phase, and the relatively low pressure at which it forms, makes antimony an ideal candidate for testing the resolution achievable using these 4th generation…

Subjects/Keywords: 669; high-pressure; shockwave; laser-generated compression pulse; extreme conditions; diamond anvil cell; laser-driven dynamic compression; antimony

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

APA (6^th Edition):

Coleman, A. L. (2018). Studies of dynamically and statically compressed antimony. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/31334

Chicago Manual of Style (16^th Edition):

Coleman, Amy Louise. “Studies of dynamically and statically compressed antimony.” 2018. Doctoral Dissertation, University of Edinburgh. Accessed January 25, 2021. http://hdl.handle.net/1842/31334.

MLA Handbook (7^th Edition):

Coleman, Amy Louise. “Studies of dynamically and statically compressed antimony.” 2018. Web. 25 Jan 2021.

Vancouver:

Coleman AL. Studies of dynamically and statically compressed antimony. [Internet] [Doctoral dissertation]. University of Edinburgh; 2018. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/1842/31334.

Council of Science Editors:

Coleman AL. Studies of dynamically and statically compressed antimony. [Doctoral Dissertation]. University of Edinburgh; 2018. Available from: http://hdl.handle.net/1842/31334

26. Toraille, Loïc. Utilisation de centres NV comme capteurs de champs magnétiques à haute pression dans des cellules à enclumes de diamant : Using NV centers as high-pressure magnetic sensors inside diamond anvil cells.

Degree: Docteur es, Nanophysique, 2019, Université Paris-Saclay (ComUE)

URL: http://www.theses.fr/2019SACLN056

►

La pression est un paramètre physique qui modifie les interactions structurales, électroniques et magnétiques dans les matériaux. Créer une très haute pression permet donc la… (more)

▼

La pression est un paramètre physique qui modifie les interactions structurales, électroniques et magnétiques dans les matériaux. Créer une très haute pression permet donc la synthèse de nouveaux matériaux, comme par exemple des supraconducteurs ayant des valeurs de température critique record. Ces pressions peuvent être générées au moyen d’une cellule à enclume de diamant (DAC) qui peut comprimer un matériau jusqu’à des pressions de plusieurs centaines de GPa. Il est cependant difficile de caractériser les propriétés magnétiques de matériaux à l’intérieur d’une DAC à cause du très faible volume occupé par l’échantillon et des contraintes techniques. Dans cette thèse, nous proposons d’utiliser une technique de magnétométrie optique fondée sur la résonance de spin électronique de centres colorés NV du diamant. Ces centres NV sont fabriqués à la surface d’une des deux enclumes de la DAC et sont ainsi au contact de l’échantillon magnétique à caractériser.Dans un premier chapitre, nous rappelons le fonctionnement de la DAC et décrivons les techniques de mesures magnétiques développées pour la physique des hautes pressions. Nous présentons ensuite le principe de la magnétométrie à centres NV et l’appliquons à la mesure de l’aimantation d’un micro-aimant à pression ambiante. La sensibilité de cette mesure atteint celle des magnétomètres à SQUID. Le troisième chapitre discute de la façon dont les contraintes mécaniques modifient la résonance de spin du centre NV, et détaille la manière dont cet effet se combine avec celui dû à un champ magnétique externe. La possibilité de découpler les deux effets nous permet d’observer la transition de phase magnétique du fer autour de 15 à 30 GPa dans le quatrième chapitre. Enfin, le dernier chapitre décrit le contexte et les enjeux liés à la synthèse d’hydrures supraconducteurs à haute température critique. Nous montrons ensuite qu’il est possible de détecter optiquement une phase supraconductrice à l’intérieur d’une DAC en utilisant les centres NV pour observer l’effet Meissner de MgB2 à une pression de 7 GPa et avec une température critique de 30 K.

Pressure is a physical variable that alters structural, electronic and magnetic interactions in all materials. Reaching high pressure is thus a way to create new materials such as superconductors with record critical temperatures. High pressures can be enabled through the use of diamond anvil cells (DAC), which can attain pressures of several hundred of GPa. It is however quite a challenge to measure magnetic properties of materials inside a DAC because of the very small sample volume available and of technical constraints. In this PhD thesis, we demonstrate the use of a magnetometry method based on the electronic spin resonance of NV centers in diamond. These NV centers are fabricated directly on top of one of the DAC anvils, which places them in contact with the magnetic sample.In the first chapter, we describe how the DAC works and we present the different ways of probing magnetic properties that have been developed for high pressure…

Advisors/Committee Members: Roch, Jean-François (thesis director), Debuisschert, Thierry (thesis director).

Subjects/Keywords: Magnétométrie; Haute pression; Centre NV; Cellule à enclumes de diamant; Magnetometry; High pressure; NV center; Diamond anvil cell

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

APA (6^th Edition):

Toraille, L. (2019). Utilisation de centres NV comme capteurs de champs magnétiques à haute pression dans des cellules à enclumes de diamant : Using NV centers as high-pressure magnetic sensors inside diamond anvil cells. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2019SACLN056

Chicago Manual of Style (16^th Edition):

Toraille, Loïc. “Utilisation de centres NV comme capteurs de champs magnétiques à haute pression dans des cellules à enclumes de diamant : Using NV centers as high-pressure magnetic sensors inside diamond anvil cells.” 2019. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed January 25, 2021. http://www.theses.fr/2019SACLN056.

MLA Handbook (7^th Edition):

Toraille, Loïc. “Utilisation de centres NV comme capteurs de champs magnétiques à haute pression dans des cellules à enclumes de diamant : Using NV centers as high-pressure magnetic sensors inside diamond anvil cells.” 2019. Web. 25 Jan 2021.

Vancouver:

Toraille L. Utilisation de centres NV comme capteurs de champs magnétiques à haute pression dans des cellules à enclumes de diamant : Using NV centers as high-pressure magnetic sensors inside diamond anvil cells. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2019. [cited 2021 Jan 25]. Available from: http://www.theses.fr/2019SACLN056.

Council of Science Editors:

Toraille L. Utilisation de centres NV comme capteurs de champs magnétiques à haute pression dans des cellules à enclumes de diamant : Using NV centers as high-pressure magnetic sensors inside diamond anvil cells. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2019. Available from: http://www.theses.fr/2019SACLN056

Brno University of Technology

27. Báborský, Tomáš. Vodíkové nádrže pro automobilní aplikace: Hydrogen tanks for automotive use.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/66789

► Bachelor thesis deals with hydrogen storage especially for automotive applications. It describes the characteristics of hydrogen, high-pressure hydrogen tanks, hydrogen production by electrolysis and its… (more)

Subjects/Keywords: vodík; vysokotlaké nádrže; palivový článek; hybridy; přenosné nádrže; obnovitelný zdroj; hydrogen; high pressure tanks; fuel cell; hybrids; portable tanks; renewable source

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

APA (6^th Edition):

Báborský, T. (2019). Vodíkové nádrže pro automobilní aplikace: Hydrogen tanks for automotive use. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/66789

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):

Báborský, Tomáš. “Vodíkové nádrže pro automobilní aplikace: Hydrogen tanks for automotive use.” 2019. Thesis, Brno University of Technology. Accessed January 25, 2021. http://hdl.handle.net/11012/66789.

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

MLA Handbook (7^th Edition):

Báborský, Tomáš. “Vodíkové nádrže pro automobilní aplikace: Hydrogen tanks for automotive use.” 2019. Web. 25 Jan 2021.

Vancouver:

Báborský T. Vodíkové nádrže pro automobilní aplikace: Hydrogen tanks for automotive use. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/11012/66789.

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

Council of Science Editors:

Báborský T. Vodíkové nádrže pro automobilní aplikace: Hydrogen tanks for automotive use. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/66789

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

28. WANENE, WILSON. Solid State Studies of [ReH9]-2 Complexes from Ambient to Extreme Conditions: High Volumetric Capacity Hydrogen Storage.

Degree: 2012, University of Nevada – Reno

URL: http://hdl.handle.net/11714/4026

► The implementation of new alternative energy concepts is essential considering the increased pollution and exploitation of fossil energy resources. As the simplest and most abundant… (more)

▼ The implementation of new alternative energy concepts is essential considering the increased pollution and exploitation of fossil energy resources. As the simplest and most abundant element, hydrogen has the potential to energy system. Solid state transition metal hydrides based on Re and transition metals are very attractive materials for hydrogen and energy storage due to their large volumetric capacity, providing a safe and efficient way of storing hydrogen. The [ReH9]-2 ion continues to captivate researchers because of its stability, unusually high oxidation state of rhenium metal (VII), D3h symmetry (tricapped trigonal prism); with 9 hydrogen atoms coordinating to Re atom. In this study, the effect of pressure on the metal-hydrogen bonding and the consequence on the hydrogen absorption and desorption are investigated for M[ReH9]-2, where M= Na, K, and Ba. Understanding the chemical and physical properties of metal hydrides at ambient as well as elevated pressure and temperature conditions will in sequence assist in the design of suitable storage materials with optimum thermodynamic parameters.The BaReH9 complex was synthesized and evaluated under ambient to extreme environments. For this compound, we report bulk moduli for lower and higher pressures obtained by fitting of pressure and volume data using obtained using 3rd order Birch-Murnaghan equation of state. The results exhibited a possible orientation disorder in the crystal without any phase transformation in the studied pressure, which is a divergence from computational studies. Grüneisen parameters were also calculated and reported here. High pressure studies of Na2ReH9 and K2ReH9 were also performed, report the assignment of vibrational spectroscopy at ambient condition. The structural behavior of Na2ReH9 and K2ReH9 performed at high pressure, using in-situ Raman spectroscopic and high resolution synchrotron x-ray diffraction, studies revealed new phase transformations above 9 GPa and 16 GPa for both Na2ReH9 and K2ReH9 due to compression. We deduced that the phase transformations occur to relieve this repulsion due to H-H interaction of two [ReH9]-2 ions as volume of the unit cell reduces due to pressure increases.Two new deuterated transition metal hydrides (Na2ReD9 and BaReD9) were successfully synthesized by reaction via metathesis reaction in deuterated ethanol. Raman and IR spectroscopy showed isotopic shift with (H/D) of ~1.4. The crystal structure of BaReD9 has been determined by synchrotron powder diffraction and the results were consistent with the P63/mmc (#194) space group, with lattice parameters a = 5.2924 (±0.0006) Å and c = 9.3286 (±0.0014) Å. In summary, the effect of pressure on the metal-hydrogen bonding of BaReH9, Na2ReH9, and K2ReH9 were investigated using synchrotron x-ray, Raman and IR spectroscopy. BaReH9 is stable up to the studied pressure while Na2ReH9 and K2ReH9 exhibit phase transformation at higher pressures. Two new deuterated transition metal hydrides (Na2ReD9 and BaReD9) were successfully synthesized and… Advisors/Committee Members: Chandra, Dhanesh (advisor).

Subjects/Keywords: Diamond Anvil Cell; High Pressure; Raman and IR Spectroscopy; Solid state hydrogen storage; Synchrotron X-ray diffraction; Transition Metal Hydrides

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

APA (6^th Edition):

WANENE, W. (2012). Solid State Studies of [ReH9]-2 Complexes from Ambient to Extreme Conditions: High Volumetric Capacity Hydrogen Storage. (Thesis). University of Nevada – Reno. Retrieved from http://hdl.handle.net/11714/4026

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):

WANENE, WILSON. “Solid State Studies of [ReH9]-2 Complexes from Ambient to Extreme Conditions: High Volumetric Capacity Hydrogen Storage.” 2012. Thesis, University of Nevada – Reno. Accessed January 25, 2021. http://hdl.handle.net/11714/4026.

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

MLA Handbook (7^th Edition):

WANENE, WILSON. “Solid State Studies of [ReH9]-2 Complexes from Ambient to Extreme Conditions: High Volumetric Capacity Hydrogen Storage.” 2012. Web. 25 Jan 2021.

Vancouver:

WANENE W. Solid State Studies of [ReH9]-2 Complexes from Ambient to Extreme Conditions: High Volumetric Capacity Hydrogen Storage. [Internet] [Thesis]. University of Nevada – Reno; 2012. [cited 2021 Jan 25]. Available from: http://hdl.handle.net/11714/4026.

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

Council of Science Editors:

WANENE W. Solid State Studies of [ReH9]-2 Complexes from Ambient to Extreme Conditions: High Volumetric Capacity Hydrogen Storage. [Thesis]. University of Nevada – Reno; 2012. Available from: http://hdl.handle.net/11714/4026

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

29. Dival de Brito Guerra Neto. Determinação de dados de equilíbrio líquido-vapor a altas pressões para sistemas de hidrocarbonetos assimétricos.

Degree: 2010, Universidade Federal do Rio Grande do Norte

URL: http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=4051

►

O petróleo bruto é uma complexa mistura líquida de compostos orgânicos e inorgânicos em que predominam os hidrocarbonetos, desde os alcanos mais simples até os… (more)

▼

O petróleo bruto é uma complexa mistura líquida de compostos orgânicos e inorgânicos em que predominam os hidrocarbonetos, desde os alcanos mais simples até os aromáticos mais complexos. Nessa mistura encontram-se presentes derivados como gasolina, diesel, álcool, querosene, nafta, gásoleos, etc., estes derivados são extraídos de qualquer petróleo, porém, somente os com uma qualidade bastante elevada, ou seja, com teor de hidrocarbonetos de baixo peso molecular alto são realmente viáveis a produção destes compostos. A American Petroleum Institute (API) desenvolveu um sistema de classificação dos tipos de petróleo. No Brasil a qualidade da maioria dos petróleos retirado dos poços é muito baixa, sendo assim, é necessário obter novos conhecimentos a fim de desenvolver melhores práticas de refino com o intuito de produzir derivados de petróleo de alto valor comercial. Para isso se faz necessário o estudo de equilíbrio termodinâmico de seus derivados. Esta dissertação de mestrado consiste em determinar dados de equilíbrio líquido-vapor dos sistemas Fenilciclohexano - CO2 e Fenilciclohexano - Ciclohexano e CO2 a alta pressão e temperaturas entre 30 a 70 graus Celsius. Comparações entres os dados experimentais de equilíbrio liquidovapor encontrados no laboratório e na literatura foram realizadas em relação aos valores obtidos pelo modelo termodinâmico molecular de Peng-Robinson usando o programa computacional SPECS IVCSEP v5.60, com dois parâmetros de interação ajustáveis, para fins de modelagem e simulação. Além disso, é apresentado o desenvolvimento de um equipamento de alta pressão no laboratório para determinação de dados de equilíbrio de fases

Crude oil is a complex liquid mixture of organic and inorganic compounds that are dominated by hydrocarbons. It is a mixture of alkanes from the simplest to more complex aromatic compounds that are present derivatives such as gasoline, diesel, alcohol, kerosene, naphtha, etc.. These derivatives are extracted from any oil, however, only with a very high quality, in other words, when the content of hydrocarbons of low molecular weight is high means that production of these compounds is feasible. The American Petroleum Institute (API) developed a classification system for the various types of oil. In Brazil, the quality of most of the oil taken from wells is very low, so it is necessary to generate new technology to develop best practices for refining in order to produce petroleum products of higher commercial value. Therefore, it is necessary to study the thermodynamic equilibrium properties of its derivative compounds of interest. This dissertation aims to determine vapor-liquid equilibrium (VLE) data for the systems Phenilcyclohexane - CO2, and Cyclohexane - Phenilcyclohexane - CO2 at high pressure and temperatures between 30 to 70 °C. Furthermore, comparisons between measured VLE experimental data from this work and from the literature in relation to the Peng- Robinson molecular thermodynamic model, using a simulation program SPECS IVCSEP v5.60 and two adjustable interaction…

Advisors/Committee Members: Eduardo Lins de Barros Neto, Humberto Neves Maia de Oliveira, Cláudio Dariva, Osvaldo Chiavone Filho.

Subjects/Keywords: Equilíbrio de fases; Hidrocarbonetos; Projeto de célula de alta pressão; Modelagem termodinâmica; ENGENHARIA QUIMICA; Phase equilibria; Hydrocarbons; Design a high pressure cell; Thermodynamic modeling

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

APA (6^th Edition):

Neto, D. d. B. G. (2010). Determinação de dados de equilíbrio líquido-vapor a altas pressões para sistemas de hidrocarbonetos assimétricos. (Thesis). Universidade Federal do Rio Grande do Norte. Retrieved from http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=4051

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):

Neto, Dival de Brito Guerra. “Determinação de dados de equilíbrio líquido-vapor a altas pressões para sistemas de hidrocarbonetos assimétricos.” 2010. Thesis, Universidade Federal do Rio Grande do Norte. Accessed January 25, 2021. http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=4051.

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

MLA Handbook (7^th Edition):

Neto, Dival de Brito Guerra. “Determinação de dados de equilíbrio líquido-vapor a altas pressões para sistemas de hidrocarbonetos assimétricos.” 2010. Web. 25 Jan 2021.

Vancouver:

Neto DdBG. Determinação de dados de equilíbrio líquido-vapor a altas pressões para sistemas de hidrocarbonetos assimétricos. [Internet] [Thesis]. Universidade Federal do Rio Grande do Norte; 2010. [cited 2021 Jan 25]. Available from: http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=4051.

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

Council of Science Editors:

Neto DdBG. Determinação de dados de equilíbrio líquido-vapor a altas pressões para sistemas de hidrocarbonetos assimétricos. [Thesis]. Universidade Federal do Rio Grande do Norte; 2010. Available from: http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=4051

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

Universidade do Rio Grande do Norte

30. Guerra Neto, Dival de Brito. Determinação de dados de equilíbrio líquido-vapor a altas pressões para sistemas de hidrocarbonetos assimétricos .

Degree: 2010, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15799

► Crude oil is a complex liquid mixture of organic and inorganic compounds that are dominated by hydrocarbons. It is a mixture of alkanes from the… (more)

Subjects/Keywords: Equilíbrio de fases; Hidrocarbonetos; Projeto de célula de alta pressão; Modelagem termodinâmica; Phase equilibria; Hydrocarbons; Design a high pressure cell; Thermodynamic modeling

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Guerra Neto, D. d. B. (2010). Determinação de dados de equilíbrio líquido-vapor a altas pressões para sistemas de hidrocarbonetos assimétricos . (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15799

Chicago Manual of Style (16^th Edition):

Guerra Neto, Dival de Brito. “Determinação de dados de equilíbrio líquido-vapor a altas pressões para sistemas de hidrocarbonetos assimétricos .” 2010. Masters Thesis, Universidade do Rio Grande do Norte. Accessed January 25, 2021. http://repositorio.ufrn.br/handle/123456789/15799.

MLA Handbook (7^th Edition):

Guerra Neto, Dival de Brito. “Determinação de dados de equilíbrio líquido-vapor a altas pressões para sistemas de hidrocarbonetos assimétricos .” 2010. Web. 25 Jan 2021.

Vancouver:

Guerra Neto DdB. Determinação de dados de equilíbrio líquido-vapor a altas pressões para sistemas de hidrocarbonetos assimétricos . [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2010. [cited 2021 Jan 25]. Available from: http://repositorio.ufrn.br/handle/123456789/15799.

Council of Science Editors:

Guerra Neto DdB. Determinação de dados de equilíbrio líquido-vapor a altas pressões para sistemas de hidrocarbonetos assimétricos . [Masters Thesis]. Universidade do Rio Grande do Norte; 2010. Available from: http://repositorio.ufrn.br/handle/123456789/15799

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Open Access Theses and Dissertations