| 摘要 |
PURPOSE:To obtain a superconductive material having high performance and a peroviskite structure deficient in oxygen with extremely improved reproducibility, by adding a substance capable of coprecipitating respective components to an aqueous solution prepared by dissolving salts of the respective component elements containing plural kinds of rare earth element salt. CONSTITUTION:An amine is added to an aqueous solution prepared by dissolving salts containing a mixed raw material consisting of salts of respective component elements, particularly salts of rare earth elements to shift the pH of the aqueous solution to the alkaline side and a weak acid, such as oxalic acid, is added to coprecipitate the receptive component elements. In the coprecipitation, a smaller am ount of the oxalic acid used than the theoretical one is added to provide excellent results. As a result, the aimed superconductive material, having a perovskite type crystal structure deficient in oxygen and consisting of the composition expressed by the formula is obtained by the above-mentioned coprecipitation. In this case, M in the formula is one or more rare earth elements selected from the group of Y, Sc, La, Lu, Yb, Tm, etc.; x is 1-3; y is 0.5-1.5; z is 0-3. The selection range of the raw material can be extended for producing the superconductive material having the afore-mentioned structure by the method of this invention. |
