摘要 |
PURPOSE:To obtain the titled superconductor having high oxygen concentration and high critical temperature, critical current density and critical magnetic field, by heat-treating a mixed powder of a rare earth element oxide, an alkaline earth metal carbonate and CuO in oxygen atmosphere and molding and sintering the powder. 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 700-1,000 deg.C and pulverized. The obtained powder is heat-treated at >=800 deg.C in oxygen atmosphere, molded and sintered in air or in oxygen atmosphere at 900-1,000 deg.C under atmospheric pressure for 2-64hr.
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