Abstract
Superconducting Bi-Pb-Sr-Ca-Cu-O ceramics have been synthesized by the polymerized complex method at the Bi1.8Pb0.2Sr2Ca2 Cu3Oy (A), Bi1.6Pb0.4Sr2Ca2Cu3<Oy (B) and Bi1.68Pb0.32Sr1.75Ca1.82Cu2.83Oy (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 Tc(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.
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