Abstract
Bi4Ca3Sr3Cu4Oy glass fibers a few centimeters in length were prepared by melt spinning. After heat treatment at 830 °C, the fibers became superconducting. The x-ray diffraction pattern revealed that the heat-treated fibers have the 75 K phase as the major phase and Bi2 Sr2 CuO6 and CuO as minor phases. The resistivity measurement showed that the onset superconducting temperature of the fibers was ∼80 K.
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