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- Title
Thermoelectric properties of Ca<sub>3</sub>Co<sub>4</sub>O<sub>9+δ</sub> with Lu substitution.
- Authors
Tang, G. D.; Wang, Z. H.; Xu, X. N.; Qiu, L.; Xing, L.; Du, Y. W.
- Abstract
A series of Ca3−xLuxCo4O9+δ ( x = 0, 0.1, 0.2, and 0.4) has been prepared by sol–gel method. The effects of Lutetium substitution on thermoelectric properties of Ca3Co4O9+δ have been systematically investigated from 4 to 335 K. With the partial substitution of Lu3+ for Ca2+, the resistivity and thermopower for Lu-doped samples increase, while their thermal conductivity decreases. The dimensionless figure of merit for Ca2.8Lu0.2Co4O9+δ material (ZT = 0.032) is about five times better than that for Ca3Co4O9+δ (ZT = 0.007) at 335 K. Strikingly, for Lu-doped samples, the thermopower exhibits a steeper upturn at low temperatures.
- Subjects
THERMOELECTRICITY; SUBSTITUTION (Technology); CALCIUM; LUTETIUM; LOW temperatures
- Publication
Journal of Materials Science, 2010, Vol 45, Issue 15, p3969
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-010-4461-0