Preparation of Ca3Co4O9 by polyacrylamide gel processing and its thermoelectric properties |
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| Authors: | Ying Song Ce-Wen Nan |
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| Affiliation: | (1) State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, P.R. China;(2) Department of Chemistry, Harbin Institute of Technology, Harbin, 150001, P.R. China |
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| Abstract: | Ca3Co4O9 powder was prepared by a polyacrylamide gel route in this paper. The effect of the processing on microstructure and thermoelectric properties of Ca3Co4O9 ceramics via spark plasma sintering were investigated. Electrical measurement shows that the Seebeck coefficient and conductivity are 170 μV/K and 128 S/cm, respectively, at 700 °C, yielding a power factor value of 3.70 × 10−4 W m−1 K−2 at 700 °C, which is larger than that of Ca3Co4O9 ceramics via solid-state reaction processing. The polyacrylamide gel processing is a fast, cheap, reproducible and easily scaled up chemical route to improve the thermoelectric properties of Ca3Co4O9 ceramics by preparing the homogeneous and pure Ca3Co4O9 phase. |
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| Keywords: | Thermoelectric oxide Polyacrylamide gel processing Thermoelectric properties Ca3Co4O9 |
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