Abstract—
Composite materials Bi2Te2.7Se0.3/Teδ with varying concentration (δ = 0.15, 0.2, 0.25, and 0.3) are obtained by the solvothermal synthesis of initial powders and their subsequent spark plasma sintering. During the sintering process, the samples are textured, as a result of which lamellar grains are arranged in layers perpendicular to the direction of the application of pressure during sintering (the direction of the texture axis). Upon magnification, the concentration of superstoichiometric tellurium decreases the degree of texturing. The concentration of tellurium does not affect the average grain size. Superstoichiometric tellurium is distributed along the grain boundaries, as a result of which a structure characteristic of composite materials is formed. The release of tellurium at the grain boundaries leads to a change in the thermoelectric properties of the obtained materials. The electrical resistivity naturally increases, and the total thermal conductivity decreases with an increase in the concentration of superstoichiometric tellurium.
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Funding
This work was supported by the Russian Science Foundation (grant no. 21-73-00199). The work was carried out using equipment of the Joint Research Center of Belgorod State National Research University “Technology and Materials.”
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Yapryntsev, M.N., Ozerov, M.S. On the Synthesis, Microstructure, and Thermoelectric Properties of the Composite Material Bi2Te2.7Se0.3/Teδ Obtained from Asymmetric Nanoparticles. Semiconductors (2024). https://doi.org/10.1134/S1063782624700027
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DOI: https://doi.org/10.1134/S1063782624700027