Abstract
Ca3Co4O9 sample synthesized from nanometer of CaCO3 and Co2O3 sized precursor has been prepared by solid-state reaction and fast sintering by hot press method. The fast-sintering time can maintain the particle size of the nanometer. Their thermoelectric properties at high temperatures have been studied at 300–1000 K. The usage of a nano-sized precursor leads to decreased electrical resistivity, increased power factor, and would lead to huge dimensionless figure-of-merit () growth, respectively. The main effect is observed on thermal conductivity that is lower than the sample synthesized with micrometer precursors powder from 0.67 W mK−1 which became 0.36 W mK−1 at 973 K. The best value of Ca3Co4O9 reaches 0.51 at 973 K.
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