Abstract:
The thermoelectric properties of single-crystal samples of bismuth-arsenic-tellurium solid solutions Bi$_{2-x}$As$_x$Te$_3$ (0 $\le x\le$ 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 Bi$_{2-x}$As$_x$Te$_3$ 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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