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Abstract

This invention provides a complex oxide comprising the features of : (i) being represented by the formula:(A.sub.0.4 B.sub.0.1 M.sub.0.1).sub.x/0.6 Co.sub.2 O.sub.y wherein A and B are elements differing from each other, each represents Ca, Sr or Ba, M represents Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb or Lu, 1.7.ltoreq.x.ltoreq.2, and 3.8.ltoreq.y.ltoreq.5, (ii) having a Seebeck coefficient of 100 .mu.V/K or more at a temperature of 100 K (absolute temperature) or higher and (iii) having an electrical resistivity of 10 m.OMEGA.cm or less at a temperature of 100 K (absolute temperature) or higher. The complex oxide of the invention is a material composed of low-toxicity elements existing in large amounts, the material having superior heat resistance and chemical durability and a high thermoelectric conversion efficiency in a temperature range of 600 K or higher which falls in the temperature range of waste heat.

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First Claim