A melt process to superconductive fibres of Bi2Sr2CaCu2 oxide
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A particulate precursor of superconductive Bi2Sr2CaCu2 oxide dispersed in an aqueous poly(vinyl alcohol) solution, was shaped into fibres. The fibres fired at a Tmax of 850 °C were very porous. Although they exhibited a Meissner on-set transition at 85 K, electrical resistance at 0.02 Acm−2 at 77 K was still not zero. Exposing the porous fibres to a temperature slightly above their melting point densified them. The treated fibres had a sharp Meissner transition and could carry critical current (Jc) as high as 331 A cm−2 at 77 K. They were also more resistant to the effect of a magnetic field than the fibre fired at 850 °C. Eighty percent of the treated fibre was found to be the superconductive 2 2 1 2 phase.
KeywordsOxide Polymer Alcohol Magnetic Field Melting Point
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- 8.C.-H. HSU, US Patent # 5,039,658, August 13, 1991.Google Scholar