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The crystalline phase and thermoelectric properties of sintered Ca3Co4O9/Ca3Co2O6 mixtures prepared by a two-step heat treatment were investigated. Crystal phase and surface morphology were investigated at each step of the heat treatment. The thermoelectric properties of the material and the mixture ratio of Ca3Co4O9 to Ca3Co2O6, as calculated from XRD data, were strongly influenced by the compositional ratio of Co to Ca in the starting material. As the compositional ratio of Co to Ca was increased, the magnitude of the power factor increased and the slope of the power factor decreased with respect to the temperature.

journal of the ceramic society of japan

Effect of compositional ratio of cobalt to calcium on crystal phase and thermoelectric properties of oxide thermoelectric material composed of sintered Ca&lt;sub&gt;3&lt;/sub&gt;Co&lt;sub&gt;4&lt;/sub&gt;O&lt;sub&gt;9&lt;/sub&gt;/Ca&lt;sub&gt;3&lt;/sub&gt;Co&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;6&lt;/sub&gt; mixture