For students

Supervisor: prof. dr hab. Andrzej Jeżowski

Auxillary supervisor: dr Daria Szewczyk

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Description:

The proposed thesis aims identify the possible effect of defects, pressure and chemical composition on diffusional thermal conductivity. The research is based on developing a comprehensive experimental-theoretical universal approach to describe the thermal conductivity κ(T) of solids, based on the multilateral verification of the concepts and predictions of the recently introduced theory of thermal conductivity [Simoncelli-Marzari-Mauri, Nature Physics (2019) https://doi.org/10.1038/s41567-019-0520-x]. With original methods it is expected to find manifestations of quantum tunneling in thermal conductivity according to experimental data. The methodology includes a) the study of isochoric thermal conductivity of disordered molecular crystals, amorphous materials and composites; b) measuring the isobaric thermal conductivity coefficient of highly anisotropic molecular crystals; c) analysis and systematization of literature data with subsequent computer processing on the temperature dependences of the thermal conductivity of complex crystals and amorphous materials. Additional topic targeted in the thesis will be demonstration of the correlation between the boson peak frequency and thermal conductivity of selected systems. Combination of studies on thermal conductivity and heat capacity should result in obtaining universal mutual dependencies.