| 摘要 |
PURPOSE:To obtain a compound oxide superconducting material having high critical current density, by preheating a raw material powder of a compound oxide having specific composition and crystal structure, thereby restricting the carbon content of the raw material. CONSTITUTION:A compound oxide superconducting material composed mainly of the composition of formula and containing an oxygen-deficient perovskite crystal structure is produced by sintering a raw material powder containing an element A belonging to group IIa of the periodic table, an element B belonging to group IIIa of the periodic table and Cu. In the above process, the sintering is performed after heat-treating the raw material powder until the carbon content of the raw material powder reaches <=0.6wt.%. In the formula, A is element of group IIa of the periodic table, 0.5<=u<=3, 0.5<=v<=2, 2<=w<=4 and 6<=x<=7. The raw material powder used in the above process is especially preferably a dried product of a precipitate containing the elements A, B and Cu and produced by coprecipitation process. |
