Thermoelectric Properties of $A_{n+2}$Con+1O3n+3 ($A=\text{Ca}$, Sr, Ba, $n=1--5$)

概要

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We studied the thermoelectric properties of polycrystalline samples of the $n=1$–5 members of the homologous series $A_{n+2}$Con+1O3n+3, where $A$ represents Ca, Sr, or an appropriate combination of Sr and Ba. The electrical resistivity ($\rho$) decreased monotonically with increasing temperature in all samples. With increasing temperature, the Seebeck coefficient ($S$) of the $n=1$ sample decreased, while $S$ of the $n=2--5$ samples increased up to about 900 K. The power factor ($=S^{2}/\rho$) increased with temperature in all samples. The $n=2$ sample exhibited the largest power factor, which was 0.76 μW/K2cm at 1070 K. The thermal conductivity ($\kappa$) of this sample was very small, 1.3 W/K$\cdot$m at 773 K, and the dimensionless figure of merit ($ZT=S^{2}T/\rho\kappa$) increased with temperature. By extrapolating $\kappa$ to high temperatures, $ZT$ was estimated to reach 0.054 at 1070 K in the case of the $n=2$ sample.
2004-12-15