Bi-Pb-Sr-Ca-Cu-O Superconducting Fibers Drawn from Melt-Quenched Glass Preforms

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Bi-Pb-Sr-Ca-Cu-O glass fibers were drawn from melt-quenched glass preforms by the method that is ordinarily applied to optical fiber fabrication. The drawn fibers were very flexible, and their surfaces were smooth. The glass fibers were crystallized by annealing and had superconducting properties. The annealed (1133 K, 240 hour) Bi1.6Pb0.4Sr2Ca2Cu3O x fiber exhibited superconductivity with a T c(zero) of 68 K and a critical current density (30 K, zero magnetic field) of 22 A/cm2.