Abstract
Abstract Bi-based high-Tc superconductors were prepared by using the melt-quenching method. The values of critical temperature Tc and critical current density Jc for the samples of Bi0.8 Pb0.2SrCa-CuxOy (x=1.5, 1.8 and 2.0) obtained by annealing at 840°C for 250h decreased with increasing Cu content, and the glass-ceramics with x=1.5 exhibited superconductivity with a Tc (zero) of 106K and a Jc (77K, zero magnetic field) of 250A/cm2. The formation of the high-Tc phase in the superconducting (Bi, Pb)2Sr2Ca2Cu3Oy ceramics was largely enhanced by the addition of a very small amount of Sb or Mo element. It was found that the lowering of the partial melting temperature at around 870°C caused by the coexistence of Pb and Sb or Mo elements was very important for the formation of the high-Tc phase.
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