The electrical conductivity (σ) and the coefficients of thermal e.m.f. (α), Holl (RH), and thermal conductivity (χ) of extruded n-Вi2Te2.7Se0.3 samples with various grain sizes are studied in the temperature range 77–300 K after extrusion and upon subsequent annealing. It is shown that annealing substantially increases σ and χ and has a little effect on α at 77 K. This indicates that at 77 K, the structural imperfections of grains play the main role in the electron and phonon scattering. There is a correlation between the degree of texture and thermoelectric properties.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 104–109, March, 2019.
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Tagiyev, M.M., Dzhafarova, S.Z., Ahmedova, A.M. et al. Thermoelectric Properties of Bi2Te2.7Se0.3 Solid Solution with Various Grain Sizes. Russ Phys J 62, 505–511 (2019). https://doi.org/10.1007/s11182-019-01738-4
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DOI: https://doi.org/10.1007/s11182-019-01738-4