Abstract
In this work, we study thermoelectric properties of GeTei-based alloys, doped with bismuth, with partial substitution of lead for germanium: Ge0.86Pb0.1Bi0.04Te. The aim of the study is to explore the possibility of increasing the thermoelectric efficiency of a compound by combining optimal doping and isovalent substitution to improve the electronic properties with a simultaneous decrease of the lattice thermal conductivity. We studied alloy samples prepared in two different research laboratories using similar, but not completely identical procedures. It is shown that the electronic (thermoelectric power and electrical conductivity) properties of the samples of the two groups are in good agreement with each other. The properties of alloys depend on the thermal history of the samples due to the presence at temperatures of 600–800 K of a phase transition from a low-temperature rhombohedral to a high-temperature cubic structural modification and missibility gap in GeTe–PbTe quasibinary system below 870 K. The thermoelectric figure of merit of alloys reaches a maximum value of 1.5 at a temperature of about 750 K.
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Funding
The research was supported by the Russian Foundation for Basic Research, Grant no. 18-52-80005 (BRICS) and the National Natural Science Foundation of China, Grant 51861145305 (BRICS project).
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Report at XXVII Interstate conference “Thermoelectric materials and their applications” (ISCTA 2021), Saint Petersburg, September 13−16, 2021.
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Shabaldin, A.A., Samunin, A.Y., Konstantinov, P.P. et al. Effect of Thermal History on the Properties of Efficient Thermoelectric Alloys Ge0.86Pb0.1Bi0.04Te. Semiconductors 57, 410–414 (2023). https://doi.org/10.1134/S106378262302015X
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DOI: https://doi.org/10.1134/S106378262302015X