Abstract:
The temperature and concentration dependences of the electrical (conductivity $\sigma$, the Hall coefficient $R$), thermoelectric (thermovoltage $\alpha$), and thermal (thermal conductivity $K_{\mathrm{tot}}$) characteristics of Sm$_x$Pb$_{1-x}$Te alloys ($x$ = 0, 0.02, 0.04, 0.08) are studied in the temperature range 100–500 K. Using the data for $\sigma$, $\alpha$, and $K_{\mathrm{tot}}$, the thermoelectric power $\alpha^2\sigma$, figure of merit $Z$, and efficiency $\sigma$ are calculated. It is established that at room-temperature $\alpha^2\sigma$ and $Z$ peak at the hole concentration $p\approx$ 1.2 $\times$ 10$^{18}$ cm$^{-3}$.
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