OXIDE SUPERCONDUCTING MATERIAL, ITS MANUFACTURING METHOD, SUPERCONDUCTING WIRE ROD, AND SUPERCONDUCTING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of a (Bi, Pb) 2223 based oxide superconducting material having a high critical temperature. SOLUTION: The manufacturing method of a (Bi, Pb)2Sr2Ca2Cu3Ozbased oxide superconducting material includes a process of mixing a material and a process of heat treating the mixed material at least once or more. The above heat treatment process includes a first heat treatment process to form a (Bi, Pb) 2223 crystal and a second heat treatment process in which after the (Bi, Pb) 2223 crystal is formed, Pb content in the (Bi, Pb) 2223 crystal is reduced, and the second heat treatment is carried out at a temperature lower than that of the first heat treatment. COPYRIGHT: (C)2007,JPO&INPIT