Abstract
The effects of Gd substitution on the thermoelectric (TE) properties of Ca3Co4O9+δ have been systematically investigated from 25 K to 335 K. Partial substitution of Gd in Ca3Co4O9+δ results in an increase of thermopower and resistivity, and a decrease of thermal conductivity. A maximum dimensionless figure of merit (ZT) of 0.028 was achieved at 335 K for Ca2.4Gd0.6Co4O9+δ , which is about one order of magnitude larger than that for Ca3Co4O9+δ . The investigation demonstrates that the TE performance of the Ca3Co4O9+δ system can be improved through Gd doping.
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