METHOD FOR PRODUCING COMPOSITION

The invention provides a process for production of a composition comprising a perovskite structure compound, the process comprising: a first process to heat a hydrous oxide 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 80 to 300°C in the presence of an aqueous medium so as to dehydrate the hydrous oxide; and a second process to heat a reaction product 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. The process provides a composition comprising an ABO 3 compound in the form of uniform and fine spherical particles which have an average particle diameter of 1 µm or less, preferably within a range of 0.01 to 0.5 µm, high crystallinity, and a controlled A/B ratio as desired, as well as few internal pores in the crystalline particles.