| 摘要 |
PURPOSE:To reduce the content of Ba as a poison and widen the selectivity of the raw Ba material by allowing the superconductor to have a specified chemical composition formula. CONSTITUTION:(i) The powder of Ln2O3 (Ln is Y, Nd, Sm, Eu, Gd, Dy, Ho, Er and Tm), (ii) CaO powder, (iii) Ba(NO3)2 powder, (iv) Sr(NO3)2 powder and (v) CuO powder are mixed in an inert atmosphere, The mixture is calcined in a gaseous oxygen current, and the product is crushed and formed to obtain a formed body. The body is then presintered, heat-treated, crushed and formed to obtain a formed body, which is sintered to obtain the oxide superconductor having a chemical composition formula shown by the formula ((x) is 0.001-0.3 and (y) is 0.001-0.6). |
