Thermoelectric Property of Sr and Cu Substituted Ca3Co4O9+.DELTA.

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  • Ｓｒ，　Ｃｕ複合置換Ｃａ３Ｃｏ４Ｏ９＋δの熱電特性
  • Sr Cu フクゴウ チカン Ca3Co4O 9 デルタ ノ ネツデントクセイ
  • Thermoelectric Property of Sr and Cu Substituted Ca3Co4O9+δ

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Abstract

Ca3-xSrxCo4-yCuyO9+δ (x=0, 0.1, 0.3; y=0, 0.05, 0.1) samples were prepared by using a conventional ceramic method. The crystal structure, bulk density and thermoelectric properties of the samples were investigated. In the X-ray diffraction patterns of the samples sintered at 1100°C, the single phase of Ca3Co4O9+δ was obtained. Lattice constants were increased with x and y, which suggested that Sr and Cu were substituted for Ca and Co in the Ca3Co4O9+δ structure, respectively. The sample with x=0.3 and y=0.1 got the highest density because the grain size bacame small and the void was removed.<BR>The highest density sample had the highest conductivity in all samples. The Seebeck coefficient didn't change by substitution. As a result, the sample with x=0.3 and y=0.1 had the highest power factor in all samples because of increase of the conductivity by substitution.

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