+publisher:"University of Manchester" +contributor:("Hall, David")

University of Manchester

1. Wang, Li. STUDY OF SINTERING BEHAVIOURS AND MECHANICAL PROPERTIES OF BARIUM STRONTIUM COBALT IRON OXIDE CERAMICS.

Degree: 2016, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300312

► The thesis studies the sintering behaviours and mechanical properties of perovskite-structured Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) ceramics. The sintering behaviours of BSCF are studied by sintering BSCF powder… (more)

▼ The thesis studies the sintering behaviours and mechanical properties of perovskite-structured Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) ceramics. The sintering behaviours of BSCF are studied by sintering BSCF powder using a series of sintering temperatures and dwell times. Under all circumstances, only a cubic perovskite structure is identified in as-sintered samples. The relative density of BSCF increases with increasing sintering temperature and dwell time, but shows a more significant increase with increasing temperature. While the grain size increases with increasing sintering temperature and dwell time, it is found that the increasing temperature contributes much more significantly than increasing dwell time in grain growth. The shape of grain size distribution profile is independent of sintering temperature and dwell time, but the profile shifts with different sintering conditions. The grain maintains an aspect ratio of 1.8 irrespective of sintering conditions. Similar findings are also made on the Ni-doped BSCF, but it is found that Ni doping inhibits the grain growth and retards the densification of BSCF while it has little influence on the grain size distributions and grain aspect ratio distributions. The grain growth exponent (n) and apparent activation energy (Q) are also systematically studied. It is found that grain boundary diffusion is the dominant controlling mechanism for BSCF while both grain boundary and lattice diffusions are the equally dominant controlling mechanisms for BSCF-Ni8. The fracture stress of BSCF is measured by both three-point and ring-on-ring bending tests at room and high temperatures. The fracture stress determined by three-point bending tests is consistently higher than that value measured by ring-on-ring tests for a given temperature. By utilising Weibull statistics a close prediction is made of the three-point values from the ring-on-ring values. Compared with the Young’s modulus of BSCF obtained from three-point bending tests between RT and 800 °C, the values determined from ring-on-ring tests shows a fairly good agreement. However, the Young’s modulus measured by both bending tests is lower than that value determined by micro-indentation tests. Hardness and fracture toughness are independent of grain size and grain orientation. Porosity is the dominant factor in Young’s modulus, hardness and fracture toughness of BSCF. The intrinsic hardness, intrinsic Young’s modulus and intrinsic fracture toughness of BSCF are also determined. The subcritical crack growth (SCG) of BSCF is also studied using constant load method at RT and constant stress rate method at 800 °C. It is found that that BSCF is not susceptible to SCG at RT but becomes relatively sensitive to SCG at 800 °C. The results are subsequently used as a basis for a strength–probability–time (SPT) lifetime prediction. Ni doping increases the Young’s modulus, hardness and fracture toughness of BSCF determined micro-indentation tests at RT. Both hardness and Young’s modulus show a non-monotonic trend with Ni doping content, which… Advisors/Committee Members: HALL, DAVID DA, Hall, David, Hall, David.

Subjects/Keywords: BSCF; SINTERING BEHAVIOUR; MECHANICAL PROPERTY; DOPING

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

APA (6^th Edition):

Wang, L. (2016). STUDY OF SINTERING BEHAVIOURS AND MECHANICAL PROPERTIES OF BARIUM STRONTIUM COBALT IRON OXIDE CERAMICS. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300312

Chicago Manual of Style (16^th Edition):

Wang, Li. “STUDY OF SINTERING BEHAVIOURS AND MECHANICAL PROPERTIES OF BARIUM STRONTIUM COBALT IRON OXIDE CERAMICS.” 2016. Doctoral Dissertation, University of Manchester. Accessed April 20, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300312.

MLA Handbook (7^th Edition):

Wang, Li. “STUDY OF SINTERING BEHAVIOURS AND MECHANICAL PROPERTIES OF BARIUM STRONTIUM COBALT IRON OXIDE CERAMICS.” 2016. Web. 20 Apr 2021.

Vancouver:

Wang L. STUDY OF SINTERING BEHAVIOURS AND MECHANICAL PROPERTIES OF BARIUM STRONTIUM COBALT IRON OXIDE CERAMICS. [Internet] [Doctoral dissertation]. University of Manchester; 2016. [cited 2021 Apr 20]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300312.

Council of Science Editors:

Wang L. STUDY OF SINTERING BEHAVIOURS AND MECHANICAL PROPERTIES OF BARIUM STRONTIUM COBALT IRON OXIDE CERAMICS. [Doctoral Dissertation]. University of Manchester; 2016. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300312

University of Manchester

2. Popescu, Ana-Cristina. HEADTEACHERS AND THE DECENTRALISATION OF PUBLIC EDUCATION IN POST-COMMUNIST ROMANIA.

Degree: 2013, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:202829

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ABSTRACTThe project outlined in this thesis examines the ways in which headteachers position themselves as professionals following the shift from communism to neo-liberal markets and… (more)

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ABSTRACTThe project outlined in this thesis examines the ways in which headteachers position themselves as professionals following the shift from communism to neo-liberal markets and the decentralisation of the public education system in post-communist Romania. Following this shift, Romanian headteachers faced new accountability frameworks and witnessed a reconceptualisation of their professional responsibilities. The methodology adopted is policy scholarship because, by looking at decentralisation through a historical-cultural lens, i.e. Romania’s recent history of communism and transition to a more democratic state, it best addresses the three key-research questions. The methods used are official policy documents and interviews with different stakeholders located at three different levels in the Romanian education system. These were: secondary heads and county school inspectors. Four key national policy-makers were also interviewed. In the thesis, the Romanian situation is presented (as captured) in the period 2009-2011. The decentralisation of Romanian education is dichotomous. It is a hybrid between neo-liberalism and communist throwbacks that I call politicised decentralisation. On the one hand, decentralisation and quasi-markets are being introduced into public education at the recommendation of international donors (the World Bank, the European Union). On the other hand, the endurance of communist practices makes it difficult for professionals to adapt to new professional responsibilities and accountability frameworks. A new conceptual framework emerged from the international literature, national policy documents and empirical study and was used to explore the findings. This examines the components, levels and dimensions of decentralisation in education in Romania. The key-findings show the complexities of decentralisation in headteachers’ professional activity. Importantly, the politicisation of the education system is the biggest challenge faced by the interviewees. For example, in 2012 alone there have been three different cabinets and seven ministers of education in the last five years. This has resulted in instability in post at all three levels, not least because with each change in minister both county school inspectors and headteachers are usually replaced. The findings show that new accountability frameworks emerged and impacted upon headteachers’ relationships with different stakeholders such as inspectors, local authorities, as well as parents and students as consumers of education. This thesis is important in showing how policy implementation and enactment differs depending on the socio-economic, political and cultural context. The conceptual framework developed in the thesis and the findings have relatability for educationalists, policy-makers, practitioners and researchers, both nationally and internationally, especially since the existing empirical base predominantly refers to liberal democracies.

ABSTRACTThe project outlined in this thesis examines the ways in which headteachers position…

Advisors/Committee Members: HALL, DAVID DJ, Hall, David, Gunter, Helen.

Subjects/Keywords: decentralisation; headteachers; Romania; public education

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APA (6^th Edition):

Popescu, A. (2013). HEADTEACHERS AND THE DECENTRALISATION OF PUBLIC EDUCATION IN POST-COMMUNIST ROMANIA. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:202829

Chicago Manual of Style (16^th Edition):

Popescu, Ana-Cristina. “HEADTEACHERS AND THE DECENTRALISATION OF PUBLIC EDUCATION IN POST-COMMUNIST ROMANIA.” 2013. Doctoral Dissertation, University of Manchester. Accessed April 20, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:202829.

MLA Handbook (7^th Edition):

Popescu, Ana-Cristina. “HEADTEACHERS AND THE DECENTRALISATION OF PUBLIC EDUCATION IN POST-COMMUNIST ROMANIA.” 2013. Web. 20 Apr 2021.

Vancouver:

Popescu A. HEADTEACHERS AND THE DECENTRALISATION OF PUBLIC EDUCATION IN POST-COMMUNIST ROMANIA. [Internet] [Doctoral dissertation]. University of Manchester; 2013. [cited 2021 Apr 20]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:202829.

Council of Science Editors:

Popescu A. HEADTEACHERS AND THE DECENTRALISATION OF PUBLIC EDUCATION IN POST-COMMUNIST ROMANIA. [Doctoral Dissertation]. University of Manchester; 2013. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:202829

University of Manchester

3. Ewa, Moses. A study of the inclusion of primary school children in a rural district in Nigeria.

Degree: 2015, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:281124

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This thesis presents the findings of a multi-site case study, which explored the inclusion of primary school children in rural Cross River State, Nigeria. The… (more)

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This thesis presents the findings of a multi-site case study, which explored the inclusion of primary school children in rural Cross River State, Nigeria. The research engaged specifically with the experiences of thirty 11-16-year-olds from diverse identities, drawn from primary 5 classrooms in three public primary schools sited in different rural locations within the state. In so doing, it adopted pupil presence, participation and achievement (PPA) as a conceptual framework of inclusion to examine whether education is genuinely for all primary age children within the research sites. The study was set within the context of the outcome of the 1990 Education for All (EFA) conference, which promoted universal access to education for all primary age children worldwide. As such, the investigation considered how far the selected primary schools were able to guarantee equal access, participation and achievement of all pupils under Nigeria’s national education policy. It used the PPA framework to identify the drawbacks to pupil inclusion at school and to recommend measures for addressing the obstacles experienced by some learners.Qualitative data were generated via documentary analysis, observations and interviews in schools directly featuring children. Relevant data pooled from the three sources were organised and analysed thematically based upon an interpretivist perspective. Thus, analysis of data was informed by the social constructivist theory. Data analysis indicates that current provision enables schools to allow access for nearly all children. However, despite the good intentions of national policy, girls, children from minority tribes, Muslims of Hausa/Fulani origin, and children with learning difficulties and those with impairments were vulnerable to marginalisation and exclusion within the contexts of their schools. Looking through the lens of social constructivism, the thesis strongly links the disadvantages confronting the children to limited pupil voice. The situation limited the opportunity for pupils to share their perspectives about the ways such issues as gaps in national education policy and in-school factors, including classroom practices, religious attitudes, grade repetition and social interactions were affecting their inclusion in the context. Out-of-school factors were also found to have an influence, although the study did not investigate these directly. The thesis concludes by drawing out the implications and making recommendations for reforms in policy, practice and research in favour of pupil voice within Nigeria, to promote inclusion in schools. Consideration is also given to possible implications for other developing countries.

This thesis presents the findings of a multi-site case study, which explored the inclusion of primary school children in rural Cross River State, Nigeria. The research engaged specifically with the experiences of thirty 11-16-year-olds from diverse identities, drawn from primary 5 classrooms in three public primary schools sited in different rural locations within the…

Advisors/Committee Members: HALL, DAVID DJ, Hall, David, Ainscow, Mel.

Subjects/Keywords: Inclusion; pupils; primary schools; rural areas and Nigeria

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APA (6^th Edition):

Ewa, M. (2015). A study of the inclusion of primary school children in a rural district in Nigeria. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:281124

Chicago Manual of Style (16^th Edition):

Ewa, Moses. “A study of the inclusion of primary school children in a rural district in Nigeria.” 2015. Doctoral Dissertation, University of Manchester. Accessed April 20, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:281124.

MLA Handbook (7^th Edition):

Ewa, Moses. “A study of the inclusion of primary school children in a rural district in Nigeria.” 2015. Web. 20 Apr 2021.

Vancouver:

Ewa M. A study of the inclusion of primary school children in a rural district in Nigeria. [Internet] [Doctoral dissertation]. University of Manchester; 2015. [cited 2021 Apr 20]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:281124.

Council of Science Editors:

Ewa M. A study of the inclusion of primary school children in a rural district in Nigeria. [Doctoral Dissertation]. University of Manchester; 2015. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:281124

University of Manchester

4. Sturgess, Mark Anthony. Developing a Theory of Employer and Higher Education Provider Engagement.

Degree: 2016, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:305588

► The need for more effective engagement between universities and business has been receiving more attention in recent years. Government policy aspirations are placing growing expectations… (more)

▼ The need for more effective engagement between universities and business has been receiving more attention in recent years. Government policy aspirations are placing growing expectations that the higher education sector will play its part in economic growth. At the same time, funding restrictions are imposing more pressure on universities to find different income streams, including funding from industry. However, the relationship between universities and business is often problematic, and engagement between the two is frequently not done well. Meanwhile, the role that business schools are expected to play in that engagement is contentious, which appears to put them squarely on the fault-line of these policy shifts. This study explores employer/HE provider engagement within the context of the recent policy landscape, responding with a proposed conceptual model of engagement. A business school relationship with three employer organisations forms the basis of an embedded case study, which employs an interpretive stance to help better understand the relationship between employer and HE provider. The study found that a demand-led provision of skills with employers is a more nuanced context than the narrow demand-led focus of the Leitch Review, which primarily frames the issue as a problem of supply. This study confirms that employers needs are indeed complex and often unclear, and that employers expect providers to help identify their needs. Therefore the study questions the assumption, implicit in recent policy, that it is possible to generate generic needs from employers. From the evidence addressed, it proposes that employers are seeking HE providers who can both identify their needs, and help address them with the challenge implicit in latest thinking. The study thus proposes a distinctive, dual-role for business schools, namely, a responsiveness to demand balanced by the creation and dissemination of a latest thinking which leads demand. In order to do this, the study proposes a conceptual model of relationship engagement, where the quality and importance of relationships were found to be critical for effective engagement. Therefore the study concludes that a distinctive, mutually beneficial relationship between business schools and business is unlikely to be realized without understanding and fostering effective relational engagement. Advisors/Committee Members: HALL, DAVID DJ, Hall, David, West, Melvyn.

Subjects/Keywords: Employer engagement; business school; leadership; relational engagement

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APA (6^th Edition):

Sturgess, M. A. (2016). Developing a Theory of Employer and Higher Education Provider Engagement. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:305588

Chicago Manual of Style (16^th Edition):

Sturgess, Mark Anthony. “Developing a Theory of Employer and Higher Education Provider Engagement.” 2016. Doctoral Dissertation, University of Manchester. Accessed April 20, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:305588.

MLA Handbook (7^th Edition):

Sturgess, Mark Anthony. “Developing a Theory of Employer and Higher Education Provider Engagement.” 2016. Web. 20 Apr 2021.

Vancouver:

Sturgess MA. Developing a Theory of Employer and Higher Education Provider Engagement. [Internet] [Doctoral dissertation]. University of Manchester; 2016. [cited 2021 Apr 20]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:305588.

Council of Science Editors:

Sturgess MA. Developing a Theory of Employer and Higher Education Provider Engagement. [Doctoral Dissertation]. University of Manchester; 2016. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:305588

University of Manchester

5. Lu, Xiaoxiao. The improvement of electrochemical performance of SnO2-based nanocomposites as anodes for lithium ion and sodium ion batteries.

Degree: 2015, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:276397

► Nowadays, low carbon economy becomes a significant topic over the world. Due to the decreasing amount of fossil energy source and the worsening environmental pollution,… (more)

▼ Nowadays, low carbon economy becomes a significant topic over the world. Due to the decreasing amount of fossil energy source and the worsening environmental pollution, traditional energy sources should be transferred to renewable energy sources. A transition to renewable energy will require radical changes to systems and technologies for energy storage. Lithium ion (Li-ion) batteries are now considered as the most important electrochemical energy source for portable devices, electrical vehicles and expected to be used in grid electrical energy storage. Beside on Li-ion batteries, sodium ion (Na-ion) batteries are another promising energy source, which have the advantages in cost, safety and environmental factors, and they could be used for stationary energy storage systems and large vehicles.Tin-based nanocomposites are promising to replace the traditional graphite for Li-ion batteries to achieve a higher battery performance. In 2005, Sony Corporation launched the first Sn-based anode Li-ion batteries (Nexelion) to obtain a 50% increase in volumetric capacity over the conventional battery, which marked Li-ion batteries to enter into a new cutting edge. However, Sn-based materials faced with challenges. The battery performance was limited by a low cycling life and low rate performance, and methods should be devised to overcome these shortcomings. In this thesis, SnO2-based nanocomposites, including the graphene-SnO2, the carbon-coated graphene-SnO2 and the carbon-coated nanostructured SnO2 have been prepared and investigated as anodes for Li-ion and Na-ion batteries. The microstructure, electrochemical performances and even the degradation mechanisms have been investigated as the effects for different composite materials. Chapter 4 reports an amorphous carbon coated graphene-SnO2 composite which exhibited an enhanced cycling stability. In previous researches, the performance enhancements of that type of materials were commonly attributed to the carbon coating enhancing the electronic conductivity. However, it is found that the carbon coating deeply relates to the microstructure stability of the active materials, the performance enhancement can be attributed to the enhancement of structural stability. Chapter 5 reports same composites with various graphene to amorphous carbon mass ratios. In this chapter, we try to find out the optimized composition and understanding the different roles of graphene and amorphous carbon in that type of composites. It is found that an optimised graphene to carbon mass ratio can effectively enhance the structural stability and the electrode conductivity. Chapter 6 reports a carbon-coated flower-like nanostructured SnO2 for Na-ion battery application, which has been demonstrated to have a high reversible capacity and high rate performance. The carbon coating is found to help in the formation of a high quality solid electrolyte interface (SEI) layer on the surface of the active materials. These researches focus on modifying SnO2 and SnO2-based materials by carbon coating technologies,… Advisors/Committee Members: HALL, DAVID DA, Xiao, Ping, Hall, David.

Subjects/Keywords: lithium battery; SnO2; graphene; nanocomposite; Na-ion battery; electrochemistry

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APA (6^th Edition):

Lu, X. (2015). The improvement of electrochemical performance of SnO2-based nanocomposites as anodes for lithium ion and sodium ion batteries. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:276397

Chicago Manual of Style (16^th Edition):

Lu, Xiaoxiao. “The improvement of electrochemical performance of SnO2-based nanocomposites as anodes for lithium ion and sodium ion batteries.” 2015. Doctoral Dissertation, University of Manchester. Accessed April 20, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:276397.

MLA Handbook (7^th Edition):

Lu, Xiaoxiao. “The improvement of electrochemical performance of SnO2-based nanocomposites as anodes for lithium ion and sodium ion batteries.” 2015. Web. 20 Apr 2021.

Vancouver:

Lu X. The improvement of electrochemical performance of SnO2-based nanocomposites as anodes for lithium ion and sodium ion batteries. [Internet] [Doctoral dissertation]. University of Manchester; 2015. [cited 2021 Apr 20]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:276397.

Council of Science Editors:

Lu X. The improvement of electrochemical performance of SnO2-based nanocomposites as anodes for lithium ion and sodium ion batteries. [Doctoral Dissertation]. University of Manchester; 2015. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:276397

University of Manchester

6. Chandio, Ali Dad. Processing, Characterisation and Oxidation Study of the Nickel Aluminides (βNiAl) for Thermal Barrier Coating Applications.

Degree: 2015, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:277305

► Superalloys used in aeroengines are designed to offer superior strength at increasingly higher operating temperatures. In order to optimise the working efficiency and provide additional… (more)

▼ Superalloys used in aeroengines are designed to offer superior strength at increasingly higher operating temperatures. In order to optimise the working efficiency and provide additional protection to the components such as turbine blades; a thermal barrier coating (TBC) system is applied. The TBC is a multilayer system consisting of mainly two layers i.e. bond coat (BC) and topcoat (TC). In addition, a third layer grows between the TC and BC during oxidation known as a reaction layer or thermally grown oxide (TGO). The function of the TC (usually, yttria stabilised zirconia (YSZ)) is to provide thermal insulation to aeroengine parts or reduce their surface temperatures; whereas, the BC provides binding between the TC and the substrate, and oxidation resistance to the underlying alloy by forming an adherent and continuous oxide i.e. α-Al2O3. During service, in the absence of mechanical damage to the TBC, most failures are attributed to the BC performance. The most frequently adopted BCs are; β-(Pt, Ni)Al, Pt-γ-Ni/γ’-Ni3Al and MCrAlY. In addition, reactive elements (REs) are incorporated in the BCs due to their ability to enhance oxidation resistance significantly. In the present study βNiAl based coatings/BCs and alloys with and without REs (Zr and Hf) and Pt were prepared. For the coatings CMSX-4 single crystal superalloy was used as a substrate material and pack aluminising/cementation or in-situ chemical vapour deposition (CVD) as a coating process. The isothermal oxidation testing was carried out at 1150 °C for 50 and 100 hours in air. The preparation and oxidation performance of a δNi2Al3 coating was carried out, as, this is a starting material for βNiAl matrix based coatings/or BCs. The oxidation of δNi2Al3 coating showed large volumetric changes (thickness variations), multiphase TGO, TGO/coating interface melting and spallation during oxidation. In contrast, the ‘simple βNiAl’ coating (or βNiAl matrix) was found to exhibit comparably enhanced thermal stability than that of the δNi2Al3 coating. Moreover, a detailed study of the simple βNiAl coating was also carried out in order to understand the oxidation performance. The coating before oxidation in the as-deposited condition was found to contain residual compressive stresses of 140 – 200 MPa. In contrast, after oxidation analysis exhibited substantial interdiffusion between the coating and the substrate resulting in a large reduction of the Al content and influx of substrate elements into the coating. This in turn caused coating transformation from βNiAl to the γ’-Ni3Al phase and formation of a multiphase TGO (TiO2, NiAl2O4, and ϴ-Al2O3 intrusion in α-Al2O3). Moreover, the degree of the TGO spallation and residual stresses increased with the oxidation time. In order to enhance the oxidation performance of the βNiAl coatings, the substrate pre-treatment was carried out i.e. CMSX-4 superalloy was electrolytically etched to remove the γ-Ni phase and fabricate βNiAl coatings on the remaining γ’-Ni3Al. This coating is termed as E-βNiAl. In comparison to simple… Advisors/Committee Members: HALL, DAVID DA, Hall, David, Xiao, Ping.

Subjects/Keywords: Thermal Barrier Coatings, Nickel Aluminides, Bond Coat,; REs-modifed βNiAl Coatings and Alloys, and Pt-βNiAl Bond Coat

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

APA (6^th Edition):

Chandio, A. D. (2015). Processing, Characterisation and Oxidation Study of the Nickel Aluminides (βNiAl) for Thermal Barrier Coating Applications. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:277305

Chicago Manual of Style (16^th Edition):

Chandio, Ali Dad. “Processing, Characterisation and Oxidation Study of the Nickel Aluminides (βNiAl) for Thermal Barrier Coating Applications.” 2015. Doctoral Dissertation, University of Manchester. Accessed April 20, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:277305.

MLA Handbook (7^th Edition):

Chandio, Ali Dad. “Processing, Characterisation and Oxidation Study of the Nickel Aluminides (βNiAl) for Thermal Barrier Coating Applications.” 2015. Web. 20 Apr 2021.

Vancouver:

Chandio AD. Processing, Characterisation and Oxidation Study of the Nickel Aluminides (βNiAl) for Thermal Barrier Coating Applications. [Internet] [Doctoral dissertation]. University of Manchester; 2015. [cited 2021 Apr 20]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:277305.

Council of Science Editors:

Chandio AD. Processing, Characterisation and Oxidation Study of the Nickel Aluminides (βNiAl) for Thermal Barrier Coating Applications. [Doctoral Dissertation]. University of Manchester; 2015. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:277305

University of Manchester

7. Chen, Guannan. Mixed ionic-electronic conductors in gas separation applications.

Degree: 2016, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:298559

► Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) and SrCo0.48Fe0.12Ti0.4O3-δ (SCFT) were synthesised by co-precipitation. BSCF was pressed and sintered at 1100℃ for 10 hours to pellets (relative density: 93%) from… (more)

▼ Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) and SrCo0.48Fe0.12Ti0.4O3-δ (SCFT) were synthesised by co-precipitation. BSCF was pressed and sintered at 1100℃ for 10 hours to pellets (relative density: 93%) from which X-ray diffraction (XRD) revealed single Pm-3m phase (a=3.9782 Å). Scanning electron microscopy (SEM) revealed clear equiaxed grains (grain size 33 ± 16 μm). The pellets were decomposed in 7 ± 1 % CO2/N2 at 800℃ for 1 to 30 minutes. XRD confirmed secondary phases: R-3mH phase (a=b=5.1397 Å, c=9.4847 Å) and Fm-3m phase (a=4.2490 Å). Electron backscattered diffraction (EBSD) ascribed R-3mH and Fm-3m phases to the surface and part of the cross-section precipitates, respectively as revealed by SEM. Energy dispersive X-ray spectroscopy (EDX) revealed the compositions of R-3mH and Fm-3m phases to be Ba0.65±0.03Sr0.35±0.03CO3 (BSC) and CoO, respectively. Transmission electron microscopy (TEM) and EDX revealed the structure (15R, R3m and R-3mH) and composition (Ba0.20Sr0.10Co0.59Fe0.10Ox) of lamellar precipitates in cross-section, suggesting Ba and Sr diffuse from the lamellae to BSC. A unique orientation relation (BSCF {111} // BSC {0001}) was uncovered by EBSD. TEM revealed high symmetry contact planes of lamellae and BSCF, suggesting nucleation energy governs decomposition. Fresh BSCF pellets were decomposed in N2 at 800℃. Fm-3m and P63/mmc phases were confirmed by XRD and lamellae were observed by SEM, followed by decomposition in 7±1 % N2/CO2 at 800℃. XRD revealed higher weight % of BSC and CoO. SEM revealed BSC preferring lamellae, hence hexagonal phases accelerated BSC formation. BSCF pellets were dip coated in SCFT propan-2-ol suspension (3:10), followed by sintering at 1165℃ for 10 hours. XRD revealed a Pm-3m phase (a=3.885 Å) and SEM revealed a grain size of 65 ± 9 μm and open porosity of 1.6 ± 1 %. They were annealed in 7 ± 1 % CO2/N2 at 800℃. XRD revealed no secondary phases, suggesting enhanced stability. However, oxygen permeability was reduced (1.2 ml/cm2 to 0.8 ml/cm2) because the coating composition changed to Ba0.20Sr0.27Co0.40Fe0.10Ti0.04Ox; this was revealed by EDX. Advisors/Committee Members: HALL, DAVID DA, Hall, David, Leach, Colin.

Subjects/Keywords: BSCF; CO2; Hexagonal; TEM; EBSD; Crystallography; EDX; Chemistry; Decomposition

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APA (6^th Edition):

Chen, G. (2016). Mixed ionic-electronic conductors in gas separation applications. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:298559

Chicago Manual of Style (16^th Edition):

Chen, Guannan. “Mixed ionic-electronic conductors in gas separation applications.” 2016. Doctoral Dissertation, University of Manchester. Accessed April 20, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:298559.

MLA Handbook (7^th Edition):

Chen, Guannan. “Mixed ionic-electronic conductors in gas separation applications.” 2016. Web. 20 Apr 2021.

Vancouver:

Chen G. Mixed ionic-electronic conductors in gas separation applications. [Internet] [Doctoral dissertation]. University of Manchester; 2016. [cited 2021 Apr 20]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:298559.

Council of Science Editors:

Chen G. Mixed ionic-electronic conductors in gas separation applications. [Doctoral Dissertation]. University of Manchester; 2016. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:298559

University of Manchester

8. Calisir, Ilkan. Lead-free BiFeO3-BaTiO3 high temperature piezoceramics.

Degree: 2019, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:317941

► High temperature piezoelectrics are a crucial material group that are used in actuation and sensing applications working in harsh environments. However, due to the limited… (more)

▼ High temperature piezoelectrics are a crucial material group that are used in actuation and sensing applications working in harsh environments. However, due to the limited material selection range providing cost-effective, high temperature reliability and lead-free content, the research in this area has been accelerated to find a potential candidate conforming these properties. For this purpose, the BiFeO3-BaTiO3 solid solution system has been proposed as a potential candidate and this study aims to investigate its (micro)structure-property relationships in detail. In the present study, the selected compositions are prepared via the solid state reaction method. It is found that without modification, the ceramics show high conductivity. Therefore, systematic doping strategies are employed using MnO2, La2O3 and TiO2. Nonetheless, during these investigations, a serious issue of chemical heterogeneity is identified, which has substantial impact on the functional properties. Such heterogeneity is detected in the form of core and shell regions which are BiFeO3-rich and-depleted, respectively. The formation mechanism for such core-shell-type microstructures is discussed in terms of kinetic factors and thermodynamic immiscibility, which are found to be directly linked to the incorporation of MnO2 and the influence of donor substitution of La3+ and Ti4+ ions on the solubility of the perovskite end-members (BiFeO3 and BaTiO3). Their influence on the phase content, microstructure and functional properties are significant and give rise to unique features such as discontinuity in ferroic domains across the grain morphology, prominent pseudocubic phase content, suppressed polarisation, reduced electrostrain, and temperature-dependent dielectric anomalies. On the other hand, it is shown that the application of thermal quenching treatment induces substantial alterations in the crystal structure of the shell phase, which transforms from pseudocubic symmetry (short-range ferroelectric ordering) to untilted rhombohedral symmetry (long-range ferroelectric ordering). Such a transformation is confirmed using high resolution and in-situ high energy X-ray synchrotron diffraction investigations. The in-situ studies are carried out on the samples under electric field and reveal a novel actuation mechanism which is induced by quenching. The effect of quenching on polarisation, temperature-dependent dielectric properties and magnetoelectric coupling is also investigated, by comparing with the slow-cooled states of the studied compositions. It is also found that the most dramatic alterations in structure and properties, due to quenching, are evident in the compositions with high BiFeO3 content (â‰¥75%). Advisors/Committee Members: CERNIK, ROBERT RJ, Hall, David, Cernik, Robert.

Subjects/Keywords: Ferroelectrics; Functional Ceramics; Lead-free; Dielectrics; Piezoelectrics; Multiferroic; Core-shell; Bismuth Ferrite; Synchrotron; in-situ diffraction

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

APA (6^th Edition):

Calisir, I. (2019). Lead-free BiFeO3-BaTiO3 high temperature piezoceramics. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:317941

Chicago Manual of Style (16^th Edition):

Calisir, Ilkan. “Lead-free BiFeO3-BaTiO3 high temperature piezoceramics.” 2019. Doctoral Dissertation, University of Manchester. Accessed April 20, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:317941.

MLA Handbook (7^th Edition):

Calisir, Ilkan. “Lead-free BiFeO3-BaTiO3 high temperature piezoceramics.” 2019. Web. 20 Apr 2021.

Vancouver:

Calisir I. Lead-free BiFeO3-BaTiO3 high temperature piezoceramics. [Internet] [Doctoral dissertation]. University of Manchester; 2019. [cited 2021 Apr 20]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:317941.

Council of Science Editors:

Calisir I. Lead-free BiFeO3-BaTiO3 high temperature piezoceramics. [Doctoral Dissertation]. University of Manchester; 2019. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:317941

9. Al-Aaraji, Mohammed Naji Hassan. Nanostructured ferroelectric ceramics and coatings.

Degree: 2018, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:315591

► Lead-based and lead-free ferroelectric ceramic materials were prepared at low sintering temperatures with particular regard to their applications in thick film piezoelectric components. This project… (more)

▼ Lead-based and lead-free ferroelectric ceramic materials were prepared at low sintering temperatures with particular regard to their applications in thick film piezoelectric components. This project is focused on the development of processing methods and novel compositions to be used for thick film production by electrophoretic deposition (EPD) on heat-resistant alloys. Lead-based glasses and an oxide mixture (LiCO3, Bi2O3 and CuO), denoted LBCu, with low melting points were used as sintering aids for lanthanum-doped lead zirconate titanate (PLZT) ceramics. The required temperature to achieve dense ceramics was reduced from 1250 to 950 Â°C. It was found that the highest ferroelectric properties were obtained by the use of LBCu in comparison with those incorporating glass additives due to the shielding effect of the glass phase between the ferroelectric grains. However, the results of thick film preparation shown that the samples with glass additives were much smoother and relatively free of cracks up to 1000 ÂºC. In terms of lead-free ceramics, novel compositions were prepared, based on (Ba,Ca)(Zr,Ti)O3-(K0.5Bi0.5)TiO3 (BCZT-KBT) solid solutions having various Ca and Zr contents. The new solid solutions exhibited interesting features comprising core-shell type microstructures and relaxor ferroelectric behaviour in addition to reduced sintering temperatures and higher Curie point compared with BCZT ceramics. The required sintering temperature reduced to 1125 Â°C at 65% KBT, in comparison with 1500 Â°C for pure BCZT. The results showed that the compositional heterogeneity in the shell regions was reduced by air quenching, relative to that of the slow-cooled state, due to the retention of the more chemically-homogeneous high temperature state by the quenching process. The improvements were evident in increased polarisation, piezoelectric coefficient and depolarisation temperature values. However, the slow-cooled samples exhibited high reversible strain levels due to the presence of polar nanoregions (PNRs) in the ergodic state within the shell regions. Comparing the results obtained for two BCZT compositions, it was demonstrated that the stability of the ferroelectric tetragonal phase in slow-cooled BCZT-KBT samples was improved for the ceramic with lower Ca and Zr concentrations, denoted x=0.06, in comparison with that for higher levels, denoted x=0.15. Moreover, the electric field-induced ferroelectric state in the quenched ceramic with x=0.06 was found to be more stable during heating, giving rise to an enhanced depolarisation temperature. Advisors/Committee Members: XIAO, PING P, Hall, David, Xiao, Ping.

Subjects/Keywords: Ferroelectric ceramics; Coatings; Dielectrics; Piezoelectrics

10 more images…

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

APA (6^th Edition):

Al-Aaraji, M. N. H. (2018). Nanostructured ferroelectric ceramics and coatings. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:315591

Chicago Manual of Style (16^th Edition):

Al-Aaraji, Mohammed Naji Hassan. “Nanostructured ferroelectric ceramics and coatings.” 2018. Doctoral Dissertation, University of Manchester. Accessed April 20, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:315591.

MLA Handbook (7^th Edition):

Al-Aaraji, Mohammed Naji Hassan. “Nanostructured ferroelectric ceramics and coatings.” 2018. Web. 20 Apr 2021.

Vancouver:

Al-Aaraji MNH. Nanostructured ferroelectric ceramics and coatings. [Internet] [Doctoral dissertation]. University of Manchester; 2018. [cited 2021 Apr 20]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:315591.

Council of Science Editors:

Al-Aaraji MNH. Nanostructured ferroelectric ceramics and coatings. [Doctoral Dissertation]. University of Manchester; 2018. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:315591

University of Manchester

10. Jones, Lisa Michelle. Social Class and the Emerging Professional Identities of Novice Teachers.

Degree: 2011, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:112372

► The purpose of this study was to explore the influence that social class identity has on the emerging professional identities of novice teachers. The study… (more)

▼ The purpose of this study was to explore the influence that social class identity has on the emerging professional identities of novice teachers. The study argues that schooling in the UK is classed in terms of its history, outcomes and processes, and as a result, situates teaching as a form of ‘class work’. Given the strong arguments for situating teaching in this way, this thesis seeks to increase our understanding about the way class actually works in relation to teachers’ identities and the impact this has on their work as teachers. This study was qualitative and longitudinal in nature and used semi-structured interviews as the main method of data collection. A group of eleven novice teachers were followed over a two year period as they both learnt to become teachers on a postgraduate initial teacher education programme and then one year later after most had started teaching in secondary schools. The thesis begins by examining the complexities of the heightened, emotive and fiercely debated issue of class and draws strongly on understandings that locate class in contemporary Britain as being about culture as well as social structures. It recognises that whilst the emerging professional identities of teachers are heavily shaped by life experiences prior to becoming a teacher, new and varied teaching experiences have the capacity to impact on the way teachers see themselves and their understandings of their work in schools. Using data rich stories of six of the novice teachers to exemplify the wider sample, this thesis illustrates the ways in which classed identity shapes novice teachers’ early understandings of schooling and becoming a teacher. It demonstrates that class really does matter for novice teachers but that it plays out in complex and sometimes contradictory ways. In particular, the thesis draws on the notion of social class boundaries and the way in which teaching often involves the crossing of these. The crossing of class boundaries is identified as being a central feature of the novice teacher experience. It is argued that class boundary crossing creates tensions for novice teachers not least because their own class identities are called into question and troubled by this process. One feature of this process is that many novice teachers recognise teaching as ‘class work’ and additionally understand that the cultural capital they bring to this context may not be equally valued in all educational settings. This can result in a class identity acting in restrictive and constraining ways. Whilst some novice teachers are bound by their class identities, others are able to play strategically with their class minimising the disadvantages of a perceived lack of appropriate cultural capital. This study suggests that the ability to know how and when to strategise is itself classed, a coping mechanism employed by middle rather than working class novice teachers. The study concludes by examining the implications of these findings for novice teachers and their preparation for work in schools. It argues that the… Advisors/Committee Members: DYSON, ALAN DA, Hall, David, Dyson, Alan.

Subjects/Keywords: Social class identity; Novice teachers

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

APA (6^th Edition):

Jones, L. M. (2011). Social Class and the Emerging Professional Identities of Novice Teachers. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:112372

Chicago Manual of Style (16^th Edition):

Jones, Lisa Michelle. “Social Class and the Emerging Professional Identities of Novice Teachers.” 2011. Doctoral Dissertation, University of Manchester. Accessed April 20, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:112372.

MLA Handbook (7^th Edition):

Jones, Lisa Michelle. “Social Class and the Emerging Professional Identities of Novice Teachers.” 2011. Web. 20 Apr 2021.

Vancouver:

Jones LM. Social Class and the Emerging Professional Identities of Novice Teachers. [Internet] [Doctoral dissertation]. University of Manchester; 2011. [cited 2021 Apr 20]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:112372.

Council of Science Editors:

Jones LM. Social Class and the Emerging Professional Identities of Novice Teachers. [Doctoral Dissertation]. University of Manchester; 2011. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:112372

University of Manchester

11. Li, Yizhe. Multiscale Investigation of BiFeO3-K0.5Bi0.5TiO3-PbTiO3 Ceramics.

Degree: 2019, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318403

► The BiFeO3-K0.5Bi0.5TiO3-PbTiO3 (BF-KBT-PT) ternary system has been proposed in order to develop novel piezoelectric materials for high temperature applications which are beyond the applicable range… (more)

▼ The BiFeO3-K0.5Bi0.5TiO3-PbTiO3 (BF-KBT-PT) ternary system has been proposed in order to develop novel piezoelectric materials for high temperature applications which are beyond the applicable range of commercial PbZrxTi1-xO3 (PZT) ceramics. Although the macroscopic piezoelectric properties and a ferroelectric/relaxor continuum have been reported in the BF-KBT-PT solid solution, the corresponding driving mechanisms related to the corresponding atomic structure and crystallographic evolution with composition variation in such a complex perovskite system are still not fully identified and understood. The objective of this project is to reveal the interplay between crystallographic structure over different length scales and the macroscopic physical properties. Multiscale investigations of selected compositions in the BF-KBT-PT system were realized by a combination of characterization methods including in-situ X-ray diffraction (XRD), transmission electron microscopy (TEM), digital image correlation (DIC), total scattering, ferroelectric and dielectric measurements. At room temperature, the regions of normal ferroelectric, non-ergodic and ergodic relaxors were identified in the studied composition space as well as their corresponding phase boundaries, based on the results of in-situ XRD, macroscopic ferroelectric and dielectric properties. A morphotropic phase boundary (MPB) region between rhombohedral and tetragonal phases was observed in the normal ferroelectric region, where ultrahigh electric field-induced microscopic strain was observed in the tetragonal {200} grain family, up to 5.5Ã—10-3. An electric field-induced phase transition, from pseudocubic to rhombohedral structure, was observed in the non-ergodic relaxor region. According to the quantification method for the microscopic strain developed in this project, the intrinsic lattice strain is twice that of the extrinsic domain switching contribution in the electric field-induced rhombohedral phase. The displacive behavior of cations in corresponding oxygen polyhedra for the non-ergodic composition was evaluated by a further total scattering investigation, which revealed the origin of ferroelectricity in the non-ergodic phase. The effect of ionic size on the local distortion was evaluated based on the statistical analysis of the atomic model obtained from the total scattering investigation. A focused study on the selected composition with core-shell structure was also carried out in this project, which revealed the chemical heterogeneity and strain anisotropy between the core and shell regions. Advisors/Committee Members: DERBY, BRIAN B, Hall, David, Derby, Brian.

Subjects/Keywords: ferroelectric; piezoelectric; dielectric; X-ray diffraction

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

APA (6^th Edition):

Li, Y. (2019). Multiscale Investigation of BiFeO3-K0.5Bi0.5TiO3-PbTiO3 Ceramics. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318403

Chicago Manual of Style (16^th Edition):

Li, Yizhe. “Multiscale Investigation of BiFeO3-K0.5Bi0.5TiO3-PbTiO3 Ceramics.” 2019. Doctoral Dissertation, University of Manchester. Accessed April 20, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318403.

MLA Handbook (7^th Edition):

Li, Yizhe. “Multiscale Investigation of BiFeO3-K0.5Bi0.5TiO3-PbTiO3 Ceramics.” 2019. Web. 20 Apr 2021.

Vancouver:

Li Y. Multiscale Investigation of BiFeO3-K0.5Bi0.5TiO3-PbTiO3 Ceramics. [Internet] [Doctoral dissertation]. University of Manchester; 2019. [cited 2021 Apr 20]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318403.

Council of Science Editors:

Li Y. Multiscale Investigation of BiFeO3-K0.5Bi0.5TiO3-PbTiO3 Ceramics. [Doctoral Dissertation]. University of Manchester; 2019. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318403

University of Manchester

12. Gaus, Nurdiana. THE INDONESIAN STATE UNIVERSITY IN FLUX: ACADEMICS AND THE NEO-LIBERAL TURN.

Degree: 2016, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:294387

►

This thesis aims to better understand the under life of Indonesian academics during implementation of major policy changes associated with the Higher Education Act 2012.… (more)

Subjects/Keywords: Neoliberal; higher education; Indonesia; Policy

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APA (6^th Edition):

Gaus, N. (2016). THE INDONESIAN STATE UNIVERSITY IN FLUX: ACADEMICS AND THE NEO-LIBERAL TURN. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:294387

Chicago Manual of Style (16^th Edition):

Gaus, Nurdiana. “THE INDONESIAN STATE UNIVERSITY IN FLUX: ACADEMICS AND THE NEO-LIBERAL TURN.” 2016. Doctoral Dissertation, University of Manchester. Accessed April 20, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:294387.

MLA Handbook (7^th Edition):

Gaus, Nurdiana. “THE INDONESIAN STATE UNIVERSITY IN FLUX: ACADEMICS AND THE NEO-LIBERAL TURN.” 2016. Web. 20 Apr 2021.

Vancouver:

Gaus N. THE INDONESIAN STATE UNIVERSITY IN FLUX: ACADEMICS AND THE NEO-LIBERAL TURN. [Internet] [Doctoral dissertation]. University of Manchester; 2016. [cited 2021 Apr 20]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:294387.

Council of Science Editors:

Gaus N. THE INDONESIAN STATE UNIVERSITY IN FLUX: ACADEMICS AND THE NEO-LIBERAL TURN. [Doctoral Dissertation]. University of Manchester; 2016. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:294387

University of Manchester

13. Wang, Ge. Phase switching behaviour in lead-free Na0.5Bi0.5TiO3-based ceramics.

Degree: 2017, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:306952

► This PhD project is focused on three lead-free ferroelectric solid solutions, which are specifically Na0.5Bi0.5TiO3-KNbO3(NBT-KN), Na0.5Bi0.5TiO3-NaNbO3(NBT-NN) and Na0.5Bi0.5TiO3-BaTiO3(NBT-BT), to evaluate the effects of composition, electric… (more)

▼ This PhD project is focused on three lead-free ferroelectric solid solutions, which are specifically Na0.5Bi0.5TiO3-KNbO3(NBT-KN), Na0.5Bi0.5TiO3-NaNbO3(NBT-NN) and Na0.5Bi0.5TiO3-BaTiO3(NBT-BT), to evaluate the effects of composition, electric field and temperature on structural and electrical properties. Novel observations of both reversible and irreversible electric field-induced phase switching were made in both NBT-KN and NBT-NN ceramics.The NBT-KN solid solution is the primary focus of this thesis. All compositions were observed to be cubic in the as-sintered, unpoled state. However, a well-defined ferroelectric hysteresis P-E loop was obtained for compositions with low KN contents, indicating that an irreversible phase transition from a weak-polar relaxor ferroelectric (RF) to a long-range ordered metastable ferroelectric (FE) state had occurred during the measurement procedure. Both the unpoled and poled ceramic powders were examined using high resolution synchrotron XRD. For the poled state, a rhombohedral R3c structure was identified for compositions with low KN content, confirming the occurrence of the irreversible electric field-induced structural transformation from cubic to rhombohedral. In contrast, a cubic structure was retained for high KN contents, giving rise to reversible phase switching evidenced by constricted P-E hysteresis loops. Similar behaviour was observed for NBT-NN system.An ‘in-situ’ electric field poling experiment was conducted using high energy synchrotron XRD. In certain NBT-KN compositions the structural transformation, from cubic to mixed phase cubic+rhombohedral and finally single phase rhombohedral, occurred progressively with increasing cycles of a bipolar electric field. Similar behaviour was observed for NBT-NN compositions having low NN contents. Furthermore, the distributions of domain orientation and lattice strain over a range of orientations relative to the poling direction were determined for NBT-KN, NBT-NN and NBT-BT ceramics exhibiting the rhombohedral phase.By combining the structural information with the results of dielectric and ferroelectric measurements, a phase diagram was constructed to illustrate the influence of temperature and composition on the stability of the metastable ferroelectric and relaxor ferroelectric states for the NBT-KN system. Furthermore, the phase transition temperatures obtained from dielectric measurements were correlated with the ferroelectric and thermal depolarisation characteristics for each of the NBT-KN, NBT-NN and NBT-BT systems. Advisors/Committee Members: CERNIK, ROBERT RJ, Cernik, Robert, Hall, David.

Subjects/Keywords: Lead-free; Piezoelectric ceramics; Phase transition; Ferroelectric properties; Synchrotron x-ray diffraction

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

APA (6^th Edition):

Wang, G. (2017). Phase switching behaviour in lead-free Na0.5Bi0.5TiO3-based ceramics. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:306952

Chicago Manual of Style (16^th Edition):

Wang, Ge. “Phase switching behaviour in lead-free Na0.5Bi0.5TiO3-based ceramics.” 2017. Doctoral Dissertation, University of Manchester. Accessed April 20, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:306952.

MLA Handbook (7^th Edition):

Wang, Ge. “Phase switching behaviour in lead-free Na0.5Bi0.5TiO3-based ceramics.” 2017. Web. 20 Apr 2021.

Vancouver:

Wang G. Phase switching behaviour in lead-free Na0.5Bi0.5TiO3-based ceramics. [Internet] [Doctoral dissertation]. University of Manchester; 2017. [cited 2021 Apr 20]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:306952.

Council of Science Editors:

Wang G. Phase switching behaviour in lead-free Na0.5Bi0.5TiO3-based ceramics. [Doctoral Dissertation]. University of Manchester; 2017. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:306952

14. Lythgoe, Adrian Stewart. A study of the professional identities of senior school leaders in areas of economic hardship.

Degree: 2012, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:182955

► This study makes a contribution to the body of work on the impact of education policy aimed at improving schools on the identities of school… (more)

▼ This study makes a contribution to the body of work on the impact of education policy aimed at improving schools on the identities of school leaders. It uses the National Challenge as an example of how New Labour attempted to solve the perceived problem of school failure particularly in areas of economic hardship. The aim of the study is to investigate the identities of senior school leaders as they position themselves in relation to the discourses that arise from the neoliberal ideology that has dominated education policy making since the 1980s. These schools are often officially measured and labelled as failing.A literature review locates the research in the political context of education reform over the last thirty years. A review of literature relating to the work of senior leaders in areas of economic hardship traces how knowledge claims and leadership development have shaped their roles throughout this period of post-welfarist reform. It is argued that the policies that have been enacted give rise to discourses which construct some schools as being successful and others as being failures and that the notion of failure is particularly prevalent in area of economic hardship. It is within this environment that senior leaders construct their professional identities meaning that they are required to balance their beliefs and values about the nature and purpose of education with those inherent in the dominant discourses. How these school leaders both shape and are shaped by the policies that they are required to implement is central to the effectiveness of attempts to improve their schools. The work has been structured around three research questions. What are the dominant discourses and models of change in education and how do these both impact on and define schools serving areas of economic hardship? How are senior leaders constructing their professional identity in relation to these discourses and models of change? What are the implications of senior leader identity for development and change in those schools serving areas of economic hardship?The work is a policy scholarship which aims to place the research within its wider historical and sociological context. A discourse analysis of key documents which relate to the National Challenge was carried out and then interviews were conducted with twenty senior leaders. The analysis of the findings include a largely descriptive account of the main themes that emerged and then a more detailed analysis that describes identity in terms of dialogic interactions and conceptualises them using the thinking tools of Bourdieu. Findings from the study make a contribution to the body of knowledge relating to the interaction between education policy influencing school improvement and the identity of those who implement it particularly in areas of economic hardship. The research problematises and challenges some of the assumptions and some of the value inherent in the policies and provides a body of work that will inform future improvement strategies particularly if these are to… Advisors/Committee Members: HALL, DAVID DJ, Hall, David, Gunter, Helen.

…in it (the “Copyright”) and has given The University of Manchester the right to…

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

APA (6^th Edition):

Lythgoe, A. S. (2012). A study of the professional identities of senior school leaders in areas of economic hardship. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:182955

Chicago Manual of Style (16^th Edition):

Lythgoe, Adrian Stewart. “A study of the professional identities of senior school leaders in areas of economic hardship.” 2012. Doctoral Dissertation, University of Manchester. Accessed April 20, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:182955.

MLA Handbook (7^th Edition):

Lythgoe, Adrian Stewart. “A study of the professional identities of senior school leaders in areas of economic hardship.” 2012. Web. 20 Apr 2021.

Vancouver:

Lythgoe AS. A study of the professional identities of senior school leaders in areas of economic hardship. [Internet] [Doctoral dissertation]. University of Manchester; 2012. [cited 2021 Apr 20]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:182955.

Council of Science Editors:

Lythgoe AS. A study of the professional identities of senior school leaders in areas of economic hardship. [Doctoral Dissertation]. University of Manchester; 2012. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:182955

15. Mcginity, Ruth. An investigation into localised policy-making during a period of rapid educational reform in England.

Degree: 2014, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:236976

► The research reports on an ethnographic study undertaken at Kingswood, a secondary school in the North West of England, during a period of rapid reform… (more)

▼ The research reports on an ethnographic study undertaken at Kingswood, a secondary school in the North West of England, during a period of rapid reform within educational policy-making in England. The research project sets out to offer an empirical account of localised policy-making and a conceptual analysis as to how and why different social actors within and connected to the school are positioned and position-take in response to the schools’ localised development trajectory. In order to do this, the study operationalises Bourdieu’s thinking tools of field, capital and habitus as a means of theorising the complex relationship between structure and agency in the processes of localised policy-making.In order to present a detailed analysis of the positioning and position-taking I develop and deploy the conceptualisation of the neoliberal policy complex. I use this to describe and understand how the political and economic fields of production penetrate localised decision-making in which the connected agendas of performativity and accountability frame much of the localised policy processes at the research site. The neoliberal policy complex is defined by an on-going and increased commitment to legislative interventions, not least through an approach to the modernisation of public service in which autonomy and diversification are hailed as hallmarks for success. Drawing on data collected in a year long embedded study, from interviews and, observations with 18 students, five parents, 21 teachers, and seven school leaders, and documentary analysis, it is argued that within this neoliberal policy complex, the field of power is located as a centralising force in structuring the policy-making development and enactments at the local level. In order to achieve distinction within the schooling field and thus be acknowledged as legitimate within the neoliberal policy complex, Kingswood’s localised development trajectory reveals how the discourses of neoliberalism have been internalised by the social actors within the study, to produce subjective positioning which reveals a commitment to the neoliberal doxa. Within this theorisation certain knowledges, capitals and ways of doing and thinking are privileged and presented as common sense. At Kingswood, the conversion to an academy in April 2012 and the attendant re-organisation of the school provision into a Multi-Academy Trust, which has on site a ‘professional’ and a ‘studio’ school, are presented as a necessary construction for the school’s future, and the employability skills that will be subsequently embedded within the curriculum are framed as a common sense development of the purposes of education.The study concludes that such position-taking ultimately reveals how the centralising and hierarchical notions of power work to produce a narrative of misrecognition with regards to how the school must develop localised policy-making in order to remain a viable and legitimate entity in the schooling field.The research makes a contribution to the field of policy scholarship by… Advisors/Committee Members: HALL, DAVID DJ, Hall, David, Gunter, Helen.

Subjects/Keywords: Bourdieu; Localised policy-making; Rapid reform; Neo-liberal

…x29; and she has given The University of Manchester certain rights to use such Copyright… …research relationship between the school and the University of Manchester, supported by the ESRC…

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APA (6^th Edition):

Mcginity, R. (2014). An investigation into localised policy-making during a period of rapid educational reform in England. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:236976

Chicago Manual of Style (16^th Edition):

Mcginity, Ruth. “An investigation into localised policy-making during a period of rapid educational reform in England.” 2014. Doctoral Dissertation, University of Manchester. Accessed April 20, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:236976.

MLA Handbook (7^th Edition):

Mcginity, Ruth. “An investigation into localised policy-making during a period of rapid educational reform in England.” 2014. Web. 20 Apr 2021.

Vancouver:

Mcginity R. An investigation into localised policy-making during a period of rapid educational reform in England. [Internet] [Doctoral dissertation]. University of Manchester; 2014. [cited 2021 Apr 20]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:236976.

Council of Science Editors:

Mcginity R. An investigation into localised policy-making during a period of rapid educational reform in England. [Doctoral Dissertation]. University of Manchester; 2014. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:236976

16. Khalf, Abdulkarim Ziedan. Lead-free ferroelectric glass-ceramics and composites.

Degree: 2018, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313700

► Glass-ceramic composites and nanocrystalline glass-ceramics containing barium titanate (BT) or potassium sodium niobate (KNN) ferroelectric phases have been studied, with particular regard to their use… (more)

▼ Glass-ceramic composites and nanocrystalline glass-ceramics containing barium titanate (BT) or potassium sodium niobate (KNN) ferroelectric phases have been studied, with particular regard to their use as dielectric energy storage materials. Barium borosilicate glass (BBS) was used as a sintering aid for BT and KNN, producing glass-ceramic composites. The temperatures required to achieve densification were reduced from 1400 to 1200 Â°C for BCZT (Ca, Zr-doped BT) and 1170 to 1050 Â°C for KBN (Bi, Na, K, Zr-doped KNN) by the use of glass additives. An unexpected observation, found in both BCZT and KBN systems, was the heterogeneous dissolution of dopant elements into the glass, inducing additional anomalies in the relative permittivity-temperature relationships. For BCZT, the orthorhombic-tetragonal phase transformation temperature shifted upwards to â‰ˆ 50 Â°C, which was attributed to modification of the Ca/Zr ratio by preferential dissolution of Ca into the glass phase. Similarly, for KBN the dopant elements appeared to be leached into the liquid phase during sintering, resulting in relative permittivity-temperature characteristics similar to those of pure KNN. A modified BBS glass having various KNN contents was prepared by the conventional melt-quenching method and then heat-treated to induce crystallisation, producing nanocrystalline glass-ceramics. It is shown that crystallisation of an intermediate barium niobate phase initiates at temperatures in the region of 650 Â°C; this is subsequently converted into perovskite KNN together with a second phase of Ba3Nb5O15 at temperatures from 700 to 800 Â°C. The final crystallite size was in the region of 30Â±7 nm. The highest dielectric energy storage density of 0.134(4) J cm-3 was obtained for a glass-modified BT ceramic at an electric field level of 5 kV mm-1. However, the energy storage efficiency of the BT-based ceramics was relatively poor and they displayed a general tendency for saturation, indicating potentially poor performance at higher field levels. On the other hand, the KNN-based ceramics exhibited slightly lower energy storage density values, up to 0.108(1) J cm-3, but with much improved linearity and energy storage efficiency. Therefore, the latter is considered to be more suitable as energy storage dielectrics. The BBS-KNN glass-ceramics yielded relatively low energy storage density, 0.035(2) J cm-3, but the dielectric linearity and storage efficiency were similar to or better than those of the KNN ceramics, indicating good potential for use as energy storage dielectrics at very high electric field levels as a result of their nanocrystalline microstructures. Advisors/Committee Members: CERNIK, ROBERT RJ, Hall, David, Cernik, Robert.

Subjects/Keywords: Lead free; glass-ceramics; XRD diffraction

…ceramics and composites Abdulkarim Ziedan Khalf The University of Manchester for the degree of… …has given The University of Manchester certain rights to use such Copyright, including for… …financial support in the form of a PhD scholarship at the University of Manchester. - 27 - ��To…

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

APA (6^th Edition):

Khalf, A. Z. (2018). Lead-free ferroelectric glass-ceramics and composites. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313700

Chicago Manual of Style (16^th Edition):

Khalf, Abdulkarim Ziedan. “Lead-free ferroelectric glass-ceramics and composites.” 2018. Doctoral Dissertation, University of Manchester. Accessed April 20, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313700.

MLA Handbook (7^th Edition):

Khalf, Abdulkarim Ziedan. “Lead-free ferroelectric glass-ceramics and composites.” 2018. Web. 20 Apr 2021.

Vancouver:

Khalf AZ. Lead-free ferroelectric glass-ceramics and composites. [Internet] [Doctoral dissertation]. University of Manchester; 2018. [cited 2021 Apr 20]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313700.

Council of Science Editors:

Khalf AZ. Lead-free ferroelectric glass-ceramics and composites. [Doctoral Dissertation]. University of Manchester; 2018. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313700

17. Tangsritrakul, Jirapa. Structure and functional properties of modified potassium sodium niobate ceramics.

Degree: 2019, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318007

► Promising piezoelectric properties have been reported in lead-free potassium sodium niobate-based ceramics by introducing Bi0.5(Na0.82K0.18)0.5ZrO3 (BNKZ) into K0.48Na0.52Nb0.95Sb0.05O3 (KNNS) solid solutions in order to control… (more)

▼ Promising piezoelectric properties have been reported in lead-free potassium sodium niobate-based ceramics by introducing Bi0.5(Na0.82K0.18)0.5ZrO3 (BNKZ) into K0.48Na0.52Nb0.95Sb0.05O3 (KNNS) solid solutions in order to control the polymorphic phase transformation temperatures. In this work, high-resolution synchrotron x-ray powder diffraction (SXPD) was employed to investigate the phase coexistence, whereas high-energy x-ray diffraction was used to observe the electromechanical response for KNNS-BNKZ ceramics. High-resolution SXPD measurements confirmed that the addition of BNKZ in KNNS ceramics caused an increase of the rhombohedral-orthorhombic phase transition temperature (TR-O) and a decrease of the orthorhombic-tetragonal phase transition temperature (TO-T), leading to the occurrence of orthorhombic-tetragonal and rhombohedral-tetragonal coexisting phases at room temperature. Moreover, core-shell microstructures were observed due to chemical heterogeneity for BNKZ-containing compositions and led to the presence of weak shoulders in the temperature-dependent SXPD profiles due to the difference in lattice spacing between K-enriched core and K-deficient shell regions. To improve the homogeneity, different methods, double calcination and attrition milling, were used to produce the KNNS-BNKZ ceramics. However, the presence of core-shell microstructures was still observed for the KNNS-BNKZ ceramics produced using both methods, with the enhancement of grain size in comparison with the ceramic using single calcination. In terms of domain-switching behaviour, the in-situ XRD patterns showed that the preferred orientation was very weak after initial poling, but it was dramatically enhanced after ageing for one day, leading to the increase of lattice strain. This may occur due to the occurrence of internal stress, generated by the mismatch between core and shell, which possibly induced ferroelectric switching of non-180 degree domains after ageing. In addition, the occurrence of polarisation rotation from the initial direction toward the orthogonal poling direction was illustrated in a shear-mode study using an applied cross-poling field. Advisors/Committee Members: FREER, ROBERT R, Hall, David, Freer, Robert.

Subjects/Keywords: polymorphic phase transformation; synchrotron x-ray diffraction; lead-free piezoceramic; core-shell microstructure; potassium sodium niobate; temperature dependence

…Tangsritrakul For Doctor of Philosophy at the University of Manchester 2018 Promising piezoelectric… …he has given The University of Manchester certain rights to use such Copyright, including… …University of Manchester. Also, I would like to thank Thammasat University for financial support in… …of Manchester, UK, for enabling me to access various instruments; Mr. Michael Faulkner, Dr… …addition, I would also like to extend my thanks to many staff in School of Materials, University…

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

APA (6^th Edition):

Tangsritrakul, J. (2019). Structure and functional properties of modified potassium sodium niobate ceramics. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318007

Chicago Manual of Style (16^th Edition):

Tangsritrakul, Jirapa. “Structure and functional properties of modified potassium sodium niobate ceramics.” 2019. Doctoral Dissertation, University of Manchester. Accessed April 20, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318007.

MLA Handbook (7^th Edition):

Tangsritrakul, Jirapa. “Structure and functional properties of modified potassium sodium niobate ceramics.” 2019. Web. 20 Apr 2021.

Vancouver:

Tangsritrakul J. Structure and functional properties of modified potassium sodium niobate ceramics. [Internet] [Doctoral dissertation]. University of Manchester; 2019. [cited 2021 Apr 20]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318007.

Council of Science Editors:

Tangsritrakul J. Structure and functional properties of modified potassium sodium niobate ceramics. [Doctoral Dissertation]. University of Manchester; 2019. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318007

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