Abstract
Ca 3Co 4O 9/Ag composites incorporating different amounts of Ag were synthesized by solid-state reaction. Scanning electron microscopy revealed Ag particles dispersed among and combined with Ca 3Co 4O 9 grains several times larger in size. The electrical resistivity ( ρ ) of the composites is favorably lower than that of Ca 3Co 4O 9 alone and decreases with increasing Ag content. It can thus be inferred that the highly conductive Ag particles between the oxide grains contribute to the reduction of ρ . Although minimal in smaller amounts, the addition of Ag also seems to have a negative impact on the Seebeck coefficient ( S) of the composites due to its poor S. Since the reduction of ρ is more significant than the degradation of S, the power factor is found to be improved by the addition of 10 wt% Ag.
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