DocumentCode :
853961
Title :
The influence of filament size and atmosphere on the microstructure and J/sub c/ of round multifilament Bi/sub 2/Sr/sub 2/Ca/sub 1/Cu/sub 2/O/sub x/ wires
Author :
Motowidlo, L.R. ; Galinski, G. ; Ozeryansky, G. ; Zhang, W. ; Hellstrom, E.E. ; Sumption, M. ; Collings, T.
Author_Institution :
IGC Adv. Supercond., Waterburt, CT, USA
Volume :
5
Issue :
2
fYear :
1995
fDate :
6/1/1995 12:00:00 AM
Firstpage :
1162
Lastpage :
1166
Abstract :
Round multifilament Bi/sub 2/Sr/sub 2/Ca/sub 1/Cu/sub 2/O/sub x/ wires having 37 and 259 filaments fabricated by the oxide-powder-in-tube method were given a step solidification partial melt heat treatment in air and oxygen atmospheres. Significant improvement in the critical current density (J/sub c/), as high as 1.65/spl times/10/sup 5/ A/cm/sup 2/ at 4.2 K zero field, was obtained for samples treated in pure oxygen versus air anneals. Moreover, as the filament size decreased the J/sub c/ increased. We discuss the development of 2212 microstructure and its dependence on filament size and heat treatment atmosphere in round multifilament 2212 wires.<>
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); crystal microstructure; heat treatment; high-temperature superconductors; multifilamentary superconductors; powder technology; silver; strontium compounds; 4.2 K; Bi/sub 2/Sr/sub 2/CaCu/sub 2/O-Ag; critical current density; filament size; heat treatment atmosphere; high temperature superconductor; microstructure; oxide-powder-in-tube method; partial melt heat treatment; round multifilament wires; step solidification; Atmosphere; Conductors; Critical current density; Fabrication; Heat treatment; Microstructure; Multifilamentary superconductors; Superconducting magnets; Temperature; Wires;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/77.402768
Filename :
402768
Link To Document :
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