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Sintering Temperature Dependence of Thermoelectric Performance and Crystal Phase of Calcium Cobalt Oxides
Article first published online: 3 SEP 2010
DOI: 10.1111/j.1551-2916.2010.04026.x
© 2010 The American Ceramic Society
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How to Cite
Tahashi, M., Tanimoto, T., Goto, H., Takahashi, M. and Ido, T. (2010), Sintering Temperature Dependence of Thermoelectric Performance and Crystal Phase of Calcium Cobalt Oxides. Journal of the American Ceramic Society, 93: 3046–3048. doi: 10.1111/j.1551-2916.2010.04026.x
Publication History
- Issue published online: 6 OCT 2010
- Article first published online: 3 SEP 2010
- Manuscript No. 28000. Received May 14, 2010; approved June 28, 2010.
- Abstract
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Polycrystalline samples were synthesized by a conventional solid-state reaction. As starting materials, Co3O4 and Ca(OH)2 were mixed in a molar ratio of Ca:Co=3:4 and sintered at 1073–1373 K. The compound phases and thermoelectric properties of the resulting products were dependent on the sintering temperature. X-ray diffraction analysis showed that the Ca3Co4O9 compound was stable up to 1193 K and that Ca3Co2O6 was formed at 1273 K. At 1373 K, the sample decomposed into cobalt oxide and calcium oxide. A maximum power factor of about 100 μW/(K2·m) at 873 K was obtained for the Ca3Co4O9 phase sintered at 1193 K.