The production of Bi-Sr-Ca-Cu (BSCCO) high Tc superconductors by citrate gel route has been investigated. The compositions of the various phases formed in the sequence leading to the high Tc superconducting phases have been determined by EDX as a function of temperature and annealing time. Pb substitution for Bi has been shown to produce a high quantity of the high Tc (110K) superconducting 2223 phase. The volatilisation of both Pb and Bi during extended heat treatments has been studied. The superconducting properties of the samples have been measured by VSM.
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