Abstract
The homogenous crystallisation zones in the 1/2Bi 2O 3 SrO CaO CuO system were investigated in air, by melt-solidification. A large number of powder precursors having different cation compositions were melted in yttria stabilised zirconia crucibles, and slowly (5°C/h) cooled in an axial temperature gradient of ∼60°C/cm. The size, morphology, and the transition temperature of the grown crystals led to the determination of the homogenous crystallisation volume of the main superconducting phases. The Bi 3+, Sr 2+, and Ca 2+ cation inter-substitution provided a way to increase the T c of this phase up to 95–96K, without the contribution of yttrium. For some Bi-2212 crystals, the oxygen content was determined, and correlated with the transition temperature of this phase.
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