Critical current of dense Bi-2212 round wires as a function of axial strain

The critical current (Ic) of dense Bi2Sr2CaCu2O8+x (Bi-2212) round wires with Ag-alloy matrices was measured as a function of axial applied strain ( ), to determine whether the behavior is improved in comparison to wires with a large (30-50%) void fraction in the Bi-2212 filaments. Wires were reacte...

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Bibliographic Details
Published in:Superconductor science & technology 2015-03, Vol.28 (3), p.32001-5
Main Authors: Godeke, A, Hartman, M H C, Mentink, M G T, Jiang, J, Matras, M, Hellstrom, E E, Larbalestier, D C
Format: Article
Language:English
Subjects:
Axial strain
BEND TESTS
Bi-2212
BISMUTH OXIDE
COPPER OXIDE
Density
Filaments
Laboratories
Melts
overpressure
Springs
STRAIN
SUPERCONDUCTORS
WIRE
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Summary:The critical current (Ic) of dense Bi2Sr2CaCu2O8+x (Bi-2212) round wires with Ag-alloy matrices was measured as a function of axial applied strain ( ), to determine whether the behavior is improved in comparison to wires with a large (30-50%) void fraction in the Bi-2212 filaments. Wires were reacted at approximately under a 1% O2 in Ar gas mixture at 100 bar pressure to densify the Bi-2212 fraction during the partial melt reaction. After measurement of the Ic at 4.2 K and 5 T at Florida State University, wire sections were sent to Lawrence Berkeley National Laboratory where was measured at 4.2 K at 5 and 15 T using a U-shaped bending spring. We found that has a 0.3% wide linear reversible strain range. An unexpected result is that the width of this reversible range seems comparable to that found for porous samples reacted at only 1 bar, apparently negating an earlier plausible supposition that fuller density samples would be more resilient.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/28/3/032001