| 摘要 |
PURPOSE:To obtain the titled superconductor having high oxygen concentration and high critical temperature, critical current density and critical magnetic field, by forming and sintering a mixed powder of a rare earth element oxide, an alkaline earth metal carbonate and CuO and pulverizing, forming and sintering the obtained sintered material. CONSTITUTION:A powdery mixture composed of (A) an oxide of a rare earth element selected from La, Eu, Dy, Ho, Er, Tm, Yb and Y, (B) a carbonate of an alkaline earth metal selected from Ca, Sr, Ra and Ba and (C) CuO is pelletized as necessary, calcined in air or in oxygen atmosphere at 700-900 deg.C and pulverized to obtain powder (I). The obtained powder (I) is compression molded, sintered in air or in oxygen atmosphere at 900-1,000 deg.C for 2-64hr and pulverized to obtain powder (II). The powder (II) is compression molded and sintered in air or in oxygen atmosphere at 900-1,000 deg.C for 2-64hr.
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