Abstract
Multiphase ceramics are synthesized based on layered calcium cobaltite with a different cobalt oxide content by solid state synthesis followed by two-stage sintering. The phase composition is established, and the microstructure, electrical conductivity, and thermal electromotive force are investigated. The effect that the cation and phase compositions of ceramics have on its carrier transport properties and thermoelectric properties is established. The highest value for the power factor P is observed for multiphase ceramics with the composition Ca3Co3.4O9 + δ (0.7Ca3Co4O9 + δ + 0.3Ca3Co2O6), which is 265 μW/(m K2) at a temperature of 1100 K. This value is 20% higher than that for the Ca3Co4O9 + δ sample (P1100 = 218 μW/(m K2)) and exceeds the power factor value for low-density Ca3Co4O9 + δ ceramics prepared by the conventional solid state synthesis by a factor of 2.65.
Published Version
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