| 简介 |
PROBLEM TO BE SOLVED : To provide a large superconductive bulk material little in the segregation of 211 phase and having excellent superconductive characteristics and good homogeneity, and to provide a method for producing the same. SOLUTION : In this superconductive bulk material comprising an oxide superconductive material wherein at least RE2 BaCuO5 phase is dispersed in REBa2 Cu3 O7-x phase (RE is one of rare earth elements including Y and their combination), and having the RE composition distribution of a four time symmetric property, is obtained by press-molding powdery materials having different RE components so that the RE composition distribution has the four time symmetric property, and subsequently thermally melting and treating the molded product. |
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