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A shell model for the filament structure of Bi-2223 conductors

Phase development during the first few minutes of heat treatment of first generation (Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub y/ (Bi-2223) multifilamentary wires determines to a large extent the overall microstructure, the efficiency of primary phase development, competing secondary phase deve...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2005-06, Vol.15 (2), p.2514-2517
Main Authors: Holesinger, T.G., Kennison, J.A., Liao, S., Yuan, Y., Jiang, J., Cai, X.Y., Hellstrom, E.E., Larbalestier, D.C., Baurceanu, R.M., Maroni, V.A., Huang, Y.
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Language:English
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Summary:Phase development during the first few minutes of heat treatment of first generation (Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub y/ (Bi-2223) multifilamentary wires determines to a large extent the overall microstructure, the efficiency of primary phase development, competing secondary phase development, texture evolution, and grain-to-grain connectivity. It is shown that the filament structure of these wires can be described in terms of a shell model. The shell next to the silver sheath is comprised of well-formed Bi-2223 colonies grapho-epitaxially aligned to the silver sheath and only a few grains (average one colony) thick. Inside this shell is a less well-aligned, less phase pure, more porous Bi-2223 structure through which current is carried in a nonuniform manner as shown by MOI.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2005.847509