| 摘要 |
PURPOSE:To enable reduction of raw material cost, heat treatment in air and improvement in thermal decomposition temperature, by providing the aimed material expressed by the formula (Ln1-zAlz)Ba2Cu3O7-x (Ln is Y, La, etc.) and regulating z within a specific range. CONSTITUTION:This oxide superconducting material is a material expressed by the formula (Ln1-zAlz)Ba2Cu3O7-x (z is within the range of 0.05<=z<=0.3). In the above-mentioned formula, Ln is one or more metals of Y, La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu. This material is produced by respectively weighing powders of Y2O3, Al2O3, BaCO3 and CuO which are guaranteed reagents so as to provide the composition of (Y1-zAlz)Ba2Cu3O7-x (z is within the range of 0.05<=z<=0.3), wet blending the weighed powders, drying the resultant blend, calcining the dried blend in air, coarsely crushing the calcined blend and sintering the resultant blend to prepare the aimed sintered body. The calcining or annealing treatment in production thereof is carried out at <=1050 deg.C maximum temperature thereof in air. |
