期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 500, 期 2, 页码 227-230出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.04.014
关键词
Ceramics; Sol-gel processes; Thermoelectric
资金
- Overseas of China Association for Science and Technology [08068]
A series of ceramics Ca3-xYbxCo4O9-delta (x =0, 0.2, 0.3, 0.4, 0.5) were prepared by the sal-gel method followed by pressing and sintering. The thermoelectric properties were characterized from room temperature to 870 K. Partial Yb3+ ions substituting for Ca2+ sites enter into the lattices without any impurity phase, and form highly textured structure. Ca3-xYbxCo4O9-delta samples exhibit semiconducting behavior and the Seebeck coefficient increase strikingly by increasing the content of Yb3+ ion. The thermal conductivity varies within narrow limits, and the figure of merit ZT of Ca2.8Yb0.2Co4O9-delta exceeds 0.16 at 870 K. (C) 2010 Elsevier B.V. All rights reserved.
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