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Bi-based high Tc superconducting fibers by melt extraction

Published online by Cambridge University Press:  31 January 2011

J.J. Chang ,
G. Rudkowska ,
A. Zaluska ,
P. Rudkowski ,
J.O. Ström-Olsen  and
J. Cave
J.J. Chang
Affiliation:
Centre for the Physics of Materials and Department of Physics, McGill University, Rutherford Building, 3600 University Street, Montríal, Quíbec, Canada, H3A 2T8
G. Rudkowska
Affiliation:
Centre for the Physics of Materials and Department of Physics, McGill University, Rutherford Building, 3600 University Street, Montríal, Quíbec, Canada, H3A 2T8
A. Zaluska
Affiliation:
Centre for the Physics of Materials and Department of Physics, McGill University, Rutherford Building, 3600 University Street, Montríal, Quíbec, Canada, H3A 2T8
P. Rudkowski
Affiliation:
Centre for the Physics of Materials and Department of Physics, McGill University, Rutherford Building, 3600 University Street, Montríal, Quíbec, Canada, H3A 2T8
J.O. Ström-Olsen
Affiliation:
Centre for the Physics of Materials and Department of Physics, McGill University, Rutherford Building, 3600 University Street, Montríal, Quíbec, Canada, H3A 2T8
J. Cave
Affiliation:
Institut de Recherche d'Hydro Quíbec (IREQ), 1800 Montíe Ste-Julie, Varennes, Quíbec, Canada, JOL 2PO
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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.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 9 , September 1992 , pp. 2365 - 2372
Copyright
Copyright © Materials Research Society 1992

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