Fibrous crystals containing the high-T c phase of the Bi(Pb)-Sr-Ca-Cu-O superconductor have been prepared by heating a melt-quenched plate in a stream of O2 gas. The fibers show a remarkable resistance drop at 105 K. The high-T c phase is detected on a microarea X-ray diffractometer and the high-T c crystals are found to be stacked between the low-T c platelike crystals. The highest T c(zero) value so far obtained is 96 K.
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Matsubara et al. (1989) studied this question.
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