| 摘要 |
PURPOSE:To obtain the titled powdery raw material having excellent sintering easiness, high unformity and bulk density, at a low coordinating 12 oxygen atoms and a metallic element coordinating 6 oxygen atoms, adding other constituent component compound to the calcination product and calcining the mixture. CONSTITUTION:A compound (e.g. PbO) of a metallic element coordinating 12 oxygen atoms (A) and a compound (e.g. ZrO2) of a metallic element coordinating 6 oxygen atoms (B) are dissolved in concentrated nitric acid having high purity, diluted with pure water or alcohol to a free nitric acid concentration of 5-10mol concentration and treated with an anion exchange resin to effect the adsorption and removal of radioative isotops such as U, Th, etc. The aqueous solution or alcoholic solution of the component A and component B is added with a precipitant liquid (e.g. ammonia water) to form a precipitate, which is dried and calcined at 120-1,200 deg.C. The calcination product is added with the other constituent component compound (e.g. TiCl4, TiO2) and calcined at 400-1,200 deg.C to obtain the objective powdery raw material of perovskite of formula ABO3 (A+B is >=3 kinds) or its solid solution having a radioactive alpha-particle count number of <=0.1CPH/cm<2>. |
