Dresden 2026 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 19: Poster Session

MM 19.44: Poster

Dienstag, 10. März 2026, 18:00–20:00, P5

Thermal Conductivity Measurements Using Laser Flash Analysis in Mg₃(Sb,Bi)₂ and Related Compounds — •Thomas Terörde¹, Benjamin Bornmann¹, Christian Heß¹, Ran He², Vishak Sivasubramaniyan Sudandiradevi², and Kornelius Nielsch² — ¹Fakultät für Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, Wuppertal, Germany — ²Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, D-01171 Dresden, Germany

This work presents temperature-dependent thermal conductivity measurements of Mg₃(Sb,Bi)₂-based thermoelectric compounds obtained using laser flash analysis down to 150  K. Maximizing thermoelectric performance requires high electrical conductivity while simultaneously minimizing thermal conductivity, which is achieved by reducing the lattice contribution and thereby weakening the Wiedemann-Franz relation. The Sb/Bi ratio of Sb_0.6Bi_1.4 yield favorable band convergence and minimal lattice thermal conductivity. Modification of the transport behavior is sought through additional codoping with Te and Nb. Our systematic measurements as a function of Mg, Te, and Nb contents yield intrinsically reduced thermal conductivity, where an increase in the Te and Nb contents leads to a rise in the thermal conductivity at elevated temperatures, consistent with previous reports.

Keywords: Diffusivity; Thermal Conductivity; Laser Flash Analysis; Doping Effects; Thermoelectrics