Abstract
We have explored the effect of excess Ca and Cu addition on superconductivity in Bi–Pb–Sr–Ca–Cu–O system. A single phase 110 K high TC superconductor has been synthesized with Sr, Ca and Cu in the ratios of 1.6:2.4:3.6, respectively. There are two consequences, when Ca and Cu are in excess. Firstly, a single phased 110 K high TC superconductor is formed with the above mentioned ratio and secondary, the remaining Ca and Cu forms superconducting 2212 phase, non-superconducting Ca2PbO4, Ca2CuO3 and unreacted CuO. The XRD patterns and the results of the resistivity measurements are presented.
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