Thermoelectric Properties of Single Crystals of Bismuth-Arsenic-Tellurium Solid Solutions
Apreleva A. S.1, Kytin V. G.1, Kulbachinskii V. A.
1
1Lomonosov Moscow State University, Physics Faculty, Department of low temperature and superconductivity, Moscow, Russia
Email: sasha-apreleva@mail.ru, kytin@mig.phys.msu.ru, kulb@mig.phys.msu.ru
The thermoelectric properties of single-crystal samples of bismuth-arsenic-tellurium solid solutions Bi2-xAsxTe3 (0≤ x≤0.10) synthesized by the Bridgman method were studied in the temperature range 77<T<330 K. It was found that the conductivity decreases, and the Seebeck coefficient initially increases significantly and then decreases in Bi2-xAsxTe3 solid solutions with increasing x. The thermal conductivity of samples with As decreases compared to the original bismuth telluride at T<250 K and increases slightly at T>250 K. As a result, the maximum thermoelectric figure of merit ZT shifts from temperature of 300 K to temperature of 250 K with an increase in the As content. Keywords: Seebck effect, thermoconductivity, termolectrical figure of merit, bismuth telluride.
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