Superconducting oxide material, process for its production as well as a superconducting wire and superconducting device, both of which the superconducting material use

摘要

A process for producing a superconducting oxide material, wherein the process for the preparation of a (bi, pb)₂Sr₂Ca₂Cu₃O_z-superconductor material is based, and wherein the method comprises:(a) a material mixing step to form a mixed material, and(b) at least two heat for the heat treatment of the mixed material,the method the at least two heat comprise:(c) a first heat treatment step to the formation of (bi, pb) - 2223 - crystals and(d) a second heat treatment step to increase the sr - content of the (bi, pb) - 2223 - crystals after the (bi, pb) - 2223 - crystals are formed,the second heat treatment step is carried out at a temperature lower than the in the first heat treatment step is.