Journal
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volume 70, Issue 3-4, Pages 600-603Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2009.01.003
Keywords
Ceramics; Chemical synthesis; Electrical properties; Thermal conductivity
Funding
- National Natural Science Foundation of China (NSFC) [50801054, 50772026]
- Natural Science Key Fund of Heilongjiang Province in China [ZJG0605-01]
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The Ca3-xYxCo4O9+delta (X = 0, 0.15, 0.3) ceramics were prepared by combining the polyacrylamide gel method and the spark plasma sinter (SPS) technology in order to improve the thermoelectric properties of Ca3Co4O9+delta ceramics. The Seebeck coefficients and the resistivities of the Y-doped samples were obviously enhanced due to the decrease of carrier concentration, and their thermal conductivities were decreased due to the impurity scattering effect. The thermoelectric properties were improved at high temperature by Y-doping according to the power factor analysis and the thermoelectric figure of merit (ZT) data. The optimized figure of merit ZT = 0.22 at 973 K was obtained for Ca2.7Y0.3Co4O9+delta. (C) 2009 Elsevier Ltd. All rights reserved.
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