Abstract: A thermoelectric conversion material is provided with stable thermoelectric conversion properties such as power factor in air at high temperature. The thermoelectric conversion material contains a mixed metal oxide comprising M1, M2A and M2B as metal elements at a molar ratio of M1:M2A:M2B of 2:1:1 and has a perovskite crystal structure, wherein M1 represents at least one M1A selected from the group consisting of La, Y and lanthanoid elements, or a combination of M1A and at least one M1B selected from among alkaline earth metal elements, M2A represents at least one selected from the group consisting of metal elements each of which can have an atomic valence of 2, M2B represents at least one selected from the group consisting of metal elements each of which can have an atomic valence of 4, M1, M2A and M2B are different from one another, and each of M2A and M2B may contain a doping element.

Abstract: The present invention provides a zirconium oxide powder, a method for producing.the same, and a material for thermal spraying. The material for thermal spraying comprises a zirconium oxide powder comprising polyhedral particles each having not less than 6 faces, wherein the zirconium oxide powder has D50 of not less than 5 ?m and less than 15 ?m and a D90/D10 of less than 3. D10, D50 and D90 correspond to the point where the cumulative mass from the small-particle-diameter side reaches 10%, 50%, and 90% in the cumulative particle size distribution.