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Bi-based high Tc superconducting fibers by melt extraction

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Abstract

Bismuth-based high Tc superconductors have been prepared as fibers by a technique of melt extraction. As-made, the fibers are amorphous with diameters ranging from 0.7 μm to 100 μm and lengths of up to 5 cm. The fibers were subsequently transformed into high Tc superconductors by heat treatment in air. Superconducting transitions at 105 K and 82 K were measured in annealed fibers of initial composition Bi1.8Pb0.2Sr2Ca3Cu4Ox by SQUID magnetometry. The volume fractions of superconducting phases were estimated to have lower bounds of 30% for 2212 and 5% for 2223. The crystallization process has been studied by differential scanning calorimetry, electron microscopy, and x-ray diffraction. Crystallization involves first the formation of the Bi-2201 phase and a bcc phase with lattice parameter a = 0.425 nm before finally significant fractions of both the Bi-2212 and Bi-2223 phases are formed.

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Authors and Affiliations

  1. Centre for the Physics of Materials and Department of Physics, McGill University, Rutherford Building, 3600 University Street, H3A 2T8, Montríal, Quíbec, Canada

    J. J. Chang, G. Rudkowska, A. Zaluska, P. Rudkowski & J. O. Ström-Olsen

  2. Institut de Recherche d’Hydro Quíbec (IREQ), 1800 Montíe Ste-Julie, JOL 2PO, Varennes, Quíbec, Canada

    J. Cave

Authors
  1. J. J. Chang
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  2. G. Rudkowska
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  3. A. Zaluska
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  4. P. Rudkowski
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  5. J. O. Ström-Olsen
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  6. J. Cave
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Chang, J.J., Rudkowska, G., Zaluska, A. et al. Bi-based high Tc superconducting fibers by melt extraction. Journal of Materials Research 7, 2365–2372 (1992). https://doi.org/10.1557/JMR.1992.2365

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  • DOI: https://doi.org/10.1557/JMR.1992.2365

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