Graduation Year

2025

Document Type

Dissertation

Degree

Ph.D.

Degree Name

Doctor of Philosophy (Ph.D.)

Degree Granting Department

Physics

Major Professor

George S. Nolas, Ph.D.

Committee Member

Sarath Witanachchi, Ph.D.

Committee Member

Humberto Rodriguez Gutierrez,, Ph.D.

Committee Member

Jing Wang, Ph.D.

Committee Member

Mohamed Elhamdadi, Ph.D.

Keywords

Chalcogenides, Heat Capacity, Perovskites, Thermal Conductivity, Thermal Diffusion

Abstract

Thermal properties play an important role in various aspects of applications of technology startingfrom the materials property determinations to device performance improvements and their safety and stability. Measurements of the thermal properties of such materials of interest pose challenges due to the demands of these measurements for determination of intrinsic materials properties. The research included in this dissertation involved both synthesis of novel materials and their measurement of thermal properties. Solid-state materials synthesis involves various synthesis and processing techniques, while specific technological applications demand synthesis of defect-free single crystals. Such synthesis techniques were explored for the research included in this dissertation. Study of intrinsic transport properties of novel materials is a challenging task, which demands the elimination of all possible extrinsic effects on the electronic and thermal transport during the material synthesis and processing stages. Furthermore, a fundamental understanding of thermal transport of a material is crucial for any application of interest and essential for thermoelectrics, thermal barrier coatings, phase change materials and photovoltaics. This dissertation presents investigations into the thermal properties of several different classes of materials. The specific structural features most commonly observed in these materials are studied with respect to their structure-thermal properties relationships.

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