Flexible Bi-Pb-Sr-Ca-Cu-O glass fibers were prepared by the glass-drawing method. They showed superconducting properties after crystallization by heat treatment. The T c and J c values of the fibers were very sensitive to starting compositions and heat treatment conditions. The fiber with the starting composition of Bi2.1Pb0.9Sr2Ca2Cu3O y showed superconductivity with a J c=1480 A/cm2 (77 K, zero magnetic field).
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Onishi et al. (1991) studied this question.
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