Process for increasing the pinning force of superconducting Bi-Sr- Ca-Cu-O ceramic moldings

摘要

Process for increasing the pinning force of superconducting Bi- Sr-Ca- Cu-O ceramic moldings, which comprises heating the pure-phase 2212 phase of a Bi-Sr-Ca-Cu-O ceramic molding under pure oxygen or an oxygen- containing gas for from 1 to 40 minutes to a temperature of from 825. degree. to 900 C. and generating secondary-phase precipitates in the process.