| 摘要 |
PURPOSE:To suppress growth of an impurity phase and to obtain high critical current density (Jc) characteristics by partially melting a specified source material in an oxidative atmosphere. CONSTITUTION:Starting powders of the source material Bi2O3, SrCO3, CaCO3 and CuO are compounded and mixed to obtain the molar ratio of Bi:Sr:Ca:Cu=2:2:1:2. The mixture is calcined at about 800 deg.C for about 12 hours, pulverized, mixed, and further calcined. The calcined material is partially molten in an oxidative atmosphere at >=0.8atm oxygen partial pressure to obtain a Bi-based superconducting oxide essentially comprising Bi2Sr2Ca1Cu2Oy. |
