Patent ID: 8431109

Claim:
A process for producing a composition comprising a perovskite structure compound, the process comprising: a first process to heat (1) a hydroxide of at least one B group element selected from the group consisting of Ti, Zr, Hf, and Sn, at a temperature within a range of 150 to 300° C. in the presence of an aqueous medium and further in the presence of (2) at least one selected from the group consisting of (a) an inorganic acid; and (b) at least one material selected from the group consisting of an organic polybasic carboxylic acid, an organic oxypolybasic carboxylic acid, and an alkali metal salt of the carboxylic acids, so that the hydroxide of (1) is dehydrated to form a corresponding oxide; and a second process to heat the oxide obtained in the first process and a hydroxide of at least one A group element selected from the group consisting of Ba, Sr, Ca, Mg, and Pb at a temperature within a range of 100 to 300° C. in the presence of an aqueous medium, wherein an average particle size of the perovskite structure compound is 1 μm or smaller, and a ratio of particles of the perovskite structure compound having nano meter size ores relative to 100 particles of the perovskite structure compound is ten or less.