The purpose of this work was to obtain and identify the aspects of the microstructure and thermoelectric properties of a ceramic material based on the high-entropy system Bi–Sb–Te–Se–S, whose nominal composition corresponded to the compound BiSbTeSeS compound (all atoms are taken in an equiatomic ratio). It was determined that as a result of reactive spark plasma sintering of a mixture of starting powders of the elements Bi, Sb, Se, Te, and S, hexagonal and orthorhombic phases are formed in the bulk material. The hexagonal phase corresponding to the high-entropy compound Bi1.5Sb0.5Te1.25Se1.25S0.5 forms a continuous connected network. The orthorhombic phase corresponding to the wide-gap Sb3S2 semiconductor fills the gaps in the grid isolated from each other. The thermoelectric properties of the developed material, determined by the properties of the high-entropy phase, are quite promising (the maximum value of the thermoelectric figure of merit reaches about 0.18) and allows this material to be considered as a new promising high-entropy thermoelectric.
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Translated from Steklo i Keramika, No. 2, pp. 19 – 26, February, 2023.
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Vasil’ev, A.E., Ivanov, O.N., Yapryntsev, M.N. et al. Aspects of the Microstructure and Thermoelectric Properties of a Two-Phase Ceramic Material Based on the High-Entropy System Bi–Sb–Te–Se–S. Glass Ceram 80, 52–57 (2023). https://doi.org/10.1007/s10717-023-00556-y
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DOI: https://doi.org/10.1007/s10717-023-00556-y