| abstract |
(57) [Summary] [PROBLEMS] To be composed of elements with low toxicity and high abundance, Excellent heat resistance, chemical durability, etc., and is in the temperature range of waste heat 6 An object is to provide a material having high thermoelectric conversion efficiency in a temperature range of 00K or more. A general formula: (A 0.4 B 0.1 M 0.1 ) x / 0.6 Co 2 O y (where A and B are different elements, Ca, Sr or Ba, M is Bi, Sc, Y, L a, Ce, Pr, Nd, Sm, Eu, Gd, Tb, D y, Ho, Er, Yb or Lu, and 1.7 ≦ x ≦ 2.0, 3.8 ≦ y ≦ 5), and 100K A composite oxide having a Seebeck coefficient of 100 μV / K or more and an electric resistivity of 10 mΩcm or less at a temperature of (absolute temperature) or more. |