JP2966068B

PURPOSE:To stably obtain a ceramic superconductor having high critical current density by heating a formed raw material of the ceramic superconductor in an oxygen-containing atmosphere, partly fusing it and subsequently cooling it through two specified stages. CONSTITUTION:A raw material capable of producing a ceramic superconductor such as Y-Ba-Cu-O-based one or Bi-Sr-Ca-O-based one is formed into a prescribed shape and the resultant formed material is subsequently heated and kept for a prescribed time at a temperature (T1) higher than the temperature where the formed material is partly fused in an oxygen-containing atmosphere. The partly fused formed material is then cooled to the solidification temperature (T2) and kept for a prescribed time. The atmosphere is subsequently changed to an inert gas atmosphere and the formed material is then cooled from temperature (T2) to the room temperature, thus obtaining the objective ceramic superconductor. The obtained superconductor can suitably be used as a cable or a distributing wire material.