Thermoelectric Properties of YBa2Cu3O7−x-Ca3Co4O9 Segmented Oxide Ceramic
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YBa2Cu3O7-x-Ca3Co4O9 (YBCO-CCO) segmented ceramic was prepared successfully using a conventional solid state sintering technique. X-ray diffraction patterns and microstructural observation indicated phase purity and a compatibility of YBCO and CCO ceramics. The maximum values of electrical conductivity (σ), Seebeck coefficient (S) and figure of merit (ZT) of YBCO-CCO segmented ceramic were 1.23 × 104 Ω−1 m−1, 179 μV/K and 0.35, respectively. Meanwhile, the thermal conductivity (κ) values of these three compounds were not significantly different and possessed small temperature dependence. The enhancement in the ZT values of YBCO-CCO segmented ceramic at high temperature compared to the conventional CCO ceramic suggested that the former might be used as an alternative p-type material for thermoelectric devices.
KeywordsThermoelectric properties p-type material segmented oxide ceramic yttrium barium copper oxide (YBCO) calcium cobalt oxide (CCO)
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This work was financially supported by the Thailand Research Fund (TRF-RSA5880005) and Thailand Institute of Scientific and Technological Research. Partial funding from the Center of Excellence in Materials Science and Technology, the Department of Physics and Materials Science, the Faculty of Science and Chiang Mai University are also acknowledged. P. Wannasut would also like to thank the financial support from the TRF through the Royal Golden Jubilee Ph. D Program (PhD 0173/2558).
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