| 摘要 |
PURPOSE:To obtain the titled raw material powder having high uniformity and bulk density, at a low cost, by adding a precipitation-forming liquid to a solution of specific A or B-component, calcining the formed precipitate, adding specific B or A-component thereto, and calcining the mixture. CONSTITUTION:The powdery raw material of perovskite of formula ABO3 (A is metallic element coordinating 12 oxygen atoms; B is metallic element coordinating 6 oxygen atoms; the sum of the numbers of the A-component and the B-component is >=3) or its solid solution is prepared by the following method. An aqueous solution or alcoholic solution (including alkoxide solution) of the A-component and B-component excluding at least one component thereof is mixed with a precipitating liquid to form a precipitate, and is dried and calcined at 120- 1,200 deg.C. The product is added with the component excluded from above components in wet or dry state, and the mixture is calcined at 400-1,200 deg.C. The metal coordinating 12 oxygen atoms of the A-component is rere earth element such as Pb, Ba, Ca, La, etc., and the metallic element coordinating 6 oxygen atoms of the B-component is e.g. Ti, Zr, Mg, Sc, Hf, Th, W, Nb, etc. |
