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The 110-K superconducting transition in the Bi-Ca-Sr-Cu-O system has been observed by many researchers. However, not even a filamentary path has been obtained connecting these regions in multiphase, polycrystalline samples. We have achieved zero resistance at temperatures exceeding 100 K in several samples by adding Pb to the system. The highest value we have observed is Tc,zero=107 K for Bi1.8{Pb}0.2Ca₂{Sr}₂Cu₃{O}y$.
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Green et al. (1988) studied this question.
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