Abstract
Ca1−2xDyxBixMnO3 (x = 0.02, 0.05, 0.08 and 0.10) ceramics have been synthesized by solid state reaction method. Samples with relative densities up to 98% have been obtained. Microstructures have been characterized by XRD and SEM. Thermoelectric properties are evaluated between 300 and 1100 K. Both electrical resistivity and Seebeck coefficient decrease with increasing Dy and Bi content. Thermal conductivity increases with doping, increasing up to x = 0.08. The highest power factor of 420 μW (K2 m)−1 is obtained at x = 0.02, resulting in the highest dimensionless figure of merit (ZT) of 0.21 at 973 K. This value is four times as much as that of undoped CaMnO3 ceramics. All examples show good self-compatibility with weak temperature dependence.
Published Version
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