Abstract
Ca0.98Dy0.02MnO3 and Ca0.96Dy0.02Re0.02MnO3 (Re=La, Pr, Sm, Eu, Ho, and Yb) have been synthesized by the solid state reaction method. Samples with relative densities all over 96% have been obtained. Thermoelectric properties are evaluated between 300 and 1000K. The electrical resistivity shows a typical metal-like conductivity behavior, and at high temperature, 973K, decreases from 36.1mΩcm for Ca0.98Dy0.02MnO3 to 8.6mΩcm for Ca0.96Dy0.02Yb0.02MnO3. Both the absolute values of Seebeck coefficient and thermal conductivity are reduced by the introduction of second rare-earth element. The highest power factor of 415μW/(K2m) is obtained for Ca0.96Dy0.02Yb0.02MnO3 sample, resulting in the highest dimensionless figure of merit (ZT) 0.25 at 973K. This value shows an improvement of 144% compared with that of Ca0.98Dy0.02MnO3 ceramics at the same temperature.
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