PRODUCTION OF EASILY SINTERING PEROVSKITE RAW MATERIAL POWDER BY POWDER DISPERSING

摘要

PURPOSE:To produce readily sintering perovskite raw material powder efficiently, by dispersing compound powder of component metals of perovskite into water, blending an aqueous solution of another compound with a precipitate forming solution and calcining the prepared precipitate. CONSTITUTION:In perovskite shown by a general formula ABO3 (A; one or more metallic elements of oxygen 12 coordination, B; one or more metallic elements of oxygen 6 coordination), one or more water-insoluble or slightly water-soluble compound powders containing the above-mentioned metallic elements are dispersed into water. In the dispersion, one or more aqueous solutions of compounds of the metallic elements except the above-mentioned compounds is mixed with a precipitate forming solution or blended gradually in a multi-stage manner successively and uniform and dense precipitate. Then, the precipitate is washed and filtered by a rotary filter press, further emulsified, dried and calcined at 400-1,000 deg.C. Consequently, raw material powder of perovskite type structure and its solid solution, having readily sintering properties, uniformity, low cost and high bulk density is obtained.