| 摘要 |
PURPOSE:To produce perovskite raw material powder having readily sintering properties, uniformity and high bulk density, by forming gradually precipitate of each component of perovskite from a solution, washing and filtering the precipitate by a filter press and calcining the 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), precipitate of the component A is formed from an aqueous solution of a compound such as hydroxide, carbonate, etc., of the component A such as Pb, Ba, Ca, etc., and a precipitate forming solution of NH3, etc. Then, the above-mentioned reaction solution is blended with an aqueous solution of a compound of the component B such as Ti, Zr, Mg, etc., to form precipitate of the component B. Then, the precipitate is washed and filtered and washed by a rotary filter press, further emulsified and dried. Then, the dried material is calcined at 400-1,000 deg.C, to give easily sintering raw material powder of perovskite type structure and its solid solution at low cost and efficiently. |
