Abstract
A thermoelectric Na x Co 2 O 4 /Ag composite was synthesized by citric acid complex process using CH 3 COOAg as an Ag source. The powder precursor after calcination was composed of plate-like Na x Co 2 O 4 grains and Ag particles. The Ag addition deteriorated crystallographic anisotropy of the sintered body. However, the electrical resistivity and the Seebeck coefficient of this composite were significantly smaller and slightly larger, respectively, than those of the sample without Ag, resulting in lager power factor. The Ag phase dispersed in the Na x Co 2 O 4 matrix contained about 5-17 at.% Co, which is considered to cause the increase in Seebeck coefficient.
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