STUDY OF HIGH-Tc SUPERCONDUCTING MATERIALS IN (Bi.Pb)-Sr-Ca-Cu-O SYSTEM

Abstract

The high-T c superconducting materials in (Bi.Pb)-Sr-Ca-Cu-O system with zero resistance temperature of 104 K have been made by solid state reaction. The system has been compared with BiSrCaCu 2 O y composition. The preliminary results show that Pb would make the superconducting polycrystalline grains grow smaller resulting in the separation of 100–110 K and 80 K superconducting crystalline grains and connectivity among the high-T c phase grains. By comparison, the proportion of superconducting phase is not increased in the Pb doped multiphase samples. The magnetization measurement indicates that all of them belong to the weak pinning superconductors.