| 摘要 |
PURPOSE:To obtain an oxide superconductor capable of exhibiting superconductivity at nitrogen liquefaction temperature or above by providing an oxide superconductor with a specific composition formula. CONSTITUTION:An oxide superconductor is oxides of bismuth, vanadium, strontium, calcium and copper and expressed by the following composition formula. The composition formula BaalphaVbetaSrgammaCadeltaCuepsilonOx (alpha, beta, gamma, delta and epsilon represent number of mol of respective elements) alpha=2.0-beta; 0.2<=beta<=0.8; 1.8<=gamma<=2.2; 1.8<=delta<=2.2; 2.7<=epsilon<=3.3). |
