Abstract
The crystallisation of superconducting phases in a glass of nominal composition Bi 2Sr 2Ca 4Cu 5O y has been found to depend on phase separation within the glass. The most interesting result is the attainment of zero resistance even though the volume fraction of superconducting phase, estimated from Xac measurements, is smaller than 0.1%. These results have been discussed on the basis of exsolution of different phases, partial melting and rearrangement of ions at around grain boundaries. Presumably, a narrow superconducting path is formed along the flow line of the partially melted state.
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