Strain induced irreversible critical current degradation in highly dense Bi-2212 round wire

The strain induced critical current degradation of overpressure processed straight Bi-2212 Ag wires has been studied at 77 K in self-field. For the first time superconducting properties, lattice distortions, composite wire stress and strain have been measured simultaneously in a high energy synchrot...

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Bibliographic Details
Published inSuperconductor science & technology Vol. 28; no. 6; pp. 62002 - 8
Main Authors Bjoerstad, R, Scheuerlein, C, Rikel, M O, Ballarino, A, Bottura, L, Jiang, J, Matras, M, Sugano, M, Hudspeth, J, Di Michiel, M
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.06.2015
Subjects
Bi-2212
BISMUTH OXIDE
COPPER OXIDE
critical current
Degradation
Energy measurement
Filaments
LATTICE PARAMETERS
MEASUREMENT
overpressure
Reduction
Silver
STRAIN
STRESS
Stresses
SUPERCONDUCTORS
WIRE
XRD
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Summary:The strain induced critical current degradation of overpressure processed straight Bi-2212 Ag wires has been studied at 77 K in self-field. For the first time superconducting properties, lattice distortions, composite wire stress and strain have been measured simultaneously in a high energy synchrotron beamline. A permanent Ic degradation of 5% occurs when the wire strain exceeds 0.60%. At a wire strain of about 0.65% a drastic n-value and Ic reduction occur, and the composite stress and the Bi-2212 lattice parameter reach a plateau, indicating Bi-2212 filament fracturing. The x-ray diffraction measurements show that Bi-2212 exhibits linear elastic behaviour up to the irreversible strain limit.
Bibliography:ObjectType-Article-1
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ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/28/6/062002