| 摘要 |
PROBLEM TO BE SOLVED: To stably supply an RE-Ba-Cu-O bulky superconductor capable of attaining high electromagnetic force at a relatively high temp. SOLUTION: An RE-Ba-Cu-O bulky superconductor (RE is La, Nd, Sm, Eu, Gd, Y, Ho or Dy) is irradiated with neutrons to disperse and incorporate 5-50% 'amorphous phase' having 10-500 nm particle diameter or 5-50% 'recrystallized phase different from parent phase in crystal orientation' in the parent phase of the superconductor. A more favorable result is obtained when the bulky superconductor in which an RE1+xBa2-xCu3O2 crystal phase different from the parent phase in the concn. of oxygen is dispersed in the parent phase, is irradiated with neutrons. The parent phase may contain the dispersed phase of RE2 BaCuO5 crystals or RE4+2dBa2+2dCu2-dOg crystals (0.2<d<0 and 9.4<g<10).
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