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You searched for +publisher:"Michigan State University" +contributor:("Case, Eldon D"). Showing records 1 – 3 of 3 total matches.

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Michigan State University

1. Yang, Qing (Materials scientist). Development and use of a new curvature relaxation technique to measure the in situ oxygen surface exchange coefficients and stress of lanthanum strontium ferrite films.

Degree: 2014, Michigan State University

Thesis Ph. D. Michigan State University. Materials Science and Engineering - Doctor of Philosophy 2014.

Solid oxide fuel cells (SOFCs) provide fuel flexibility and the highest efficiency of any chemical-to-electrical energy conversion technology. Unfortunately, slow oxygen transport, especially that caused by low surface exchange kinetics at the cathode, limits overall SOFC performance. In the common SOFC material La<sub>0.6<sub>Sr<sub>0.4<sub>FeO<sub>3-delta<sub> (LSF64) efforts to engineer and understand oxygen surface exchange have been complicated by the 5 orders of magnitude chemical surface exchange coefficient (k) discrepancy reported in the literature. To help remedy this discrepancy, a new bilayer curvature relaxation technique utilizing the mechano-chemical coupling of LSF64 was developed in this work. This technique provides reliable, in-situ, electrode-free, simultaneous measurement of film stress and k as a function of temperature and oxygen partial pressure. This is demonstrated here by measuring LSF64 films prepared via sputter deposition, pulsed laser deposition, and colloidal spray deposition. The similarities and differences between these films are systematically investigated across multiple thermal cycles, and correlated to the microstructure, stress state and sample preparation/testing history. Further, the k of LSF64 films was measured here below 500<super>o<super>C for the first time, and distinct lattice-dominated and grain-boundary-dominated chemical stress responses were identified.

Description based on online resource;

Advisors/Committee Members: Nicholas, Jason D, Case, Eldon D, Morelli, Donald T, Ghosh, Ruby N.

Subjects/Keywords: Cathodes – Materials – Surfaces; Solid oxide fuel cells – Materials – Surfaces; Membranes (Technology) – Properties; Strains and stresses – Measurement; Electrolytic cells; Energy conversion; Lanthanum compounds; Strontium compounds; Iron compounds; Materials Science; Oxygen surface exchange; Lanthanum strontium ferrite; LSF64

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

APA (6th Edition):

Yang, Q. (. s. (2014). Development and use of a new curvature relaxation technique to measure the in situ oxygen surface exchange coefficients and stress of lanthanum strontium ferrite films. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:2647

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

Chicago Manual of Style (16th Edition):

Yang, Qing (Materials scientist). “Development and use of a new curvature relaxation technique to measure the in situ oxygen surface exchange coefficients and stress of lanthanum strontium ferrite films.” 2014. Thesis, Michigan State University. Accessed September 24, 2020. http://etd.lib.msu.edu/islandora/object/etd:2647.

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

MLA Handbook (7th Edition):

Yang, Qing (Materials scientist). “Development and use of a new curvature relaxation technique to measure the in situ oxygen surface exchange coefficients and stress of lanthanum strontium ferrite films.” 2014. Web. 24 Sep 2020.

Vancouver:

Yang Q(s. Development and use of a new curvature relaxation technique to measure the in situ oxygen surface exchange coefficients and stress of lanthanum strontium ferrite films. [Internet] [Thesis]. Michigan State University; 2014. [cited 2020 Sep 24]. Available from: http://etd.lib.msu.edu/islandora/object/etd:2647.

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

Council of Science Editors:

Yang Q(s. Development and use of a new curvature relaxation technique to measure the in situ oxygen surface exchange coefficients and stress of lanthanum strontium ferrite films. [Thesis]. Michigan State University; 2014. Available from: http://etd.lib.msu.edu/islandora/object/etd:2647

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


Michigan State University

2. Gao, Peng. Mg2(Si,Sn)-based thermoelectric materials and devices.

Degree: 2016, Michigan State University

Thesis Ph. D. Michigan State University. Materials Science and Engineering 2016

Thermoelectric effects are phenomena found in materials that can achieve direct conversion between heat flow and electricity. One important application of thermoelectric effects is thermoelectric generators, which can generate electricity when a temperature gradient is applied. Thermoelectric generators make use of various sources of heat and it is considered a promising solution for waste heat recovery.The conversion efficiency of thermoelectric generators depends on the materials used in the devices. Significant improvement in the performance of thermoelectric materials has been made in the past few decades. However, most of the good thermoelectric materials being investigated have limitations, such as the high materials cost, high materials density and toxicity of the constituent elements. The Mg2(Si,Sn)-based materials studied in this work are promising candidates for thermoelectric generators in the mid-temperature range and have drawn increasing research interest in recent years because these materials are high performance thermoelectrics that are low cost, low-density and non-toxic.In this work, systematic studies were performed on the Mg2(Si,Sn) thermoelectric materials. Thermal phase stability was studied for different compositions of Mg2Si1-xSnx and Mg2Si0.4Sn0.6 was used as base material for further optimization. Both n-type and p-type samples were obtained by doping the materials with different elements. Peak ZT ~ 1.5 for the n-type and ZT ~ 0.7 for the p-type materials were obtained, both of which are among the best reported results so far.Experimental work was also done to study the techniques to develop the Mg2Si0.4Sn0.6 materials into working devices. Different electrode materials were tested in bonding experiment for this compound, and copper was found to be the best electrode material for Mg2Si0.4Sn0.6. Preliminary work was done to demonstrate the possibility of fabricating a Mg2Si0.4Sn0.6-based thermoelectric generator and the result is promising.

Description based on online resource;

Advisors/Committee Members: Hogan, Timothy P, Case, Eldon D, Morelli, Donald T, Lee, Andre, Poltavets, Viktor V.

Subjects/Keywords: Thermoelectric materials; Solutions, Solid; Diffusion bonding (Metals); Materials Science

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

APA (6th Edition):

Gao, P. (2016). Mg2(Si,Sn)-based thermoelectric materials and devices. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:3941

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

Chicago Manual of Style (16th Edition):

Gao, Peng. “Mg2(Si,Sn)-based thermoelectric materials and devices.” 2016. Thesis, Michigan State University. Accessed September 24, 2020. http://etd.lib.msu.edu/islandora/object/etd:3941.

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

MLA Handbook (7th Edition):

Gao, Peng. “Mg2(Si,Sn)-based thermoelectric materials and devices.” 2016. Web. 24 Sep 2020.

Vancouver:

Gao P. Mg2(Si,Sn)-based thermoelectric materials and devices. [Internet] [Thesis]. Michigan State University; 2016. [cited 2020 Sep 24]. Available from: http://etd.lib.msu.edu/islandora/object/etd:3941.

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

Council of Science Editors:

Gao P. Mg2(Si,Sn)-based thermoelectric materials and devices. [Thesis]. Michigan State University; 2016. Available from: http://etd.lib.msu.edu/islandora/object/etd:3941

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


Michigan State University

3. Schmidt, Robert David. Processing and nanostructure influences on mechanical properties of thermoelectric materials.

Degree: 2014, Michigan State University

Thesis Ph. D. Michigan State University. Materials Science and Engineering 2014.

Thermoelectric (TE) materials are materials that can generate an electric current from a thermal gradient, with possible service in recovery of waste heat such as engine exhaust. Significant progress has been made in improving TE conversion efficiency, typically reported according to the figure of merit, ZT, with several recent papers publishing ZT values above 2. Furthermore, cost reductions may be made by the use of lower cost elements such as Mg, Si, Sn, Pb, Se and S in TE materials, while achieving ZT values between 1.3 and 1.8. To be used in a device, the thermoelectric material must be able to withstand the applied thermal and mechanical forces without failure. However, these materials are brittle, with low fracture toughness typically less than 1.5 MPa-m1/2, and often less than 0.5 MPa-m1/2. For comparison, window glass is approximately 0.75 MPa-m1/2. They have been optimized with nanoprecipitates, nanoparticles, doping, alterations in stoichiometry, powder processing and other techniques, all of which may alter the mechanical properties. In this study, the effect of SiC nanoparticle additions in Mg2Si, SnTe and Ag nanoparticle additions in the skutterudite Ba0.3Co4Sb12 on the elastic moduli, hardness and fracture toughness are measured. Large changes (~20%) in the elastic moduli in SnTe1+x as a function of x at 0 and 0.016 are shown. The effect on mechanical properties of doping and precipitates of CdS or ZnS in a PbS or PbSe matrix have been reported.Changes in sintering behavior of the skutterudite with the Ag nanoparticle additions were explored. Possible liquid phase sintering, with associated benefits in lower processing temperature, faster densification and lower cost, has been shown. A technique has been proposed for determining additional liquid phase sintering aids in other TE materials.The effects of porosity, grain size, powder processing method, and sintering method were explored with YbAl3 and Ba0.3Co4Sb12, with the porosity dependence of the elastic moduli reported. Only one other TE material has the porosity dependence of the elastic moduli previously reported in the literature, lead-antimony-silver-tellurium (LAST), and the effect of different powder processing and sintering methods has never been reported previously on TE materials.

Description based on online resource; title from PDF t.p. (viewed on August 15, 2017)

Advisors/Committee Members: Case, Eldon D, Hogan, Timothy P, Morelli, Donald T, Sakamoto, Jeffrey S.

Subjects/Keywords: Thermoelectric materials – Mechanical properties; Nanostructures; Materials Science

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

APA (6th Edition):

Schmidt, R. D. (2014). Processing and nanostructure influences on mechanical properties of thermoelectric materials. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:2972

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

Chicago Manual of Style (16th Edition):

Schmidt, Robert David. “Processing and nanostructure influences on mechanical properties of thermoelectric materials.” 2014. Thesis, Michigan State University. Accessed September 24, 2020. http://etd.lib.msu.edu/islandora/object/etd:2972.

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

MLA Handbook (7th Edition):

Schmidt, Robert David. “Processing and nanostructure influences on mechanical properties of thermoelectric materials.” 2014. Web. 24 Sep 2020.

Vancouver:

Schmidt RD. Processing and nanostructure influences on mechanical properties of thermoelectric materials. [Internet] [Thesis]. Michigan State University; 2014. [cited 2020 Sep 24]. Available from: http://etd.lib.msu.edu/islandora/object/etd:2972.

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

Council of Science Editors:

Schmidt RD. Processing and nanostructure influences on mechanical properties of thermoelectric materials. [Thesis]. Michigan State University; 2014. Available from: http://etd.lib.msu.edu/islandora/object/etd:2972

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

.