| 摘要 |
PURPOSE:To provide the title Bi-based oxide superconductor giving high critical temperature without the need for quenching process, consisting of a multiple oxide containing Bi, Sb, Sr, Ca, Mg, Ba and Cu at a specified proportion. CONSTITUTION:The objective oxide superconductor of 2212 phase, >=90 deg.K in Tc<zero>, consisting of a multiple oxide of composition Bi1-ySbySrACaBMgCBaPCu1.0+ or -0.2OX (A=0.6-1.2, B=0.35-0.7, C=0.05-0.2, D=0.05-0.2, y=0.05-0.3). The present superconductor can be obtained by weighing and mixing the respective raw materials followed by calcination, grinding, forming and then further calcination at pref. 810-900 deg.C in a nitrogen atmosphere or such atmosphere containing <10vol.% of oxygen. |
