Polymerized Complex Synthesis of Pure Homogeneous Bi-Pb-Sr-Ca-Cu-O Superconductors

Abstract

Superconducting Bi-Pb-Sr-Ca-Cu-O ceramics have been synthesized by the polymerized complex method at the Bi_1.8Pb_0.2Sr₂Ca₂ Cu₃O_y (A), Bi_1.6Pb_0.4Sr₂Ca₂Cu_3<O_y (B) and Bi_1.68Pb_0.32Sr_1.75Ca_1.82Cu_2.83O_y (C) compositions. The present technique offers more convenient and easier fabrication of highly pure and homogeneous (Bi, Pb)-2223 superconductors compared with other elaborate preparation procedures based on wet-chemical techniques. Complex susceptibility measurements show that T_c(onset) of the (Bi, Pb)2223 phase remains almost constant at 108 K independent of the compositions. However, the intergranular coupling between the active (Bi, Pb)-2223 superconducting grains was very dependent on the compositions as well as on the sintering period.