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

被引：39

作者：

Bjoerstad, R. ^{[1
]}

Scheuerlein, C. ^{[1
]}

Rikel, M. O. ^{[2
]}

Ballarino, A. ^{[1
]}

Bottura, L. ^{[1
]}

Jiang, J. ^{[3
]}

Matras, M. ^{[3
]}

Sugano, M. ^{[4
]}

Hudspeth, J. ^{[5
]}

Di Michiel, M. ^{[5
]}

机构：

[1] CERN, European Org Nucl Res, CH-1211 Geneva 23, Switzerland

[2] Nexans SuperCond GmbH, D-50351 Hurth, Germany

[3] Florida State Univ, Ctr Appl Superconduct, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

[4] High Energy Accelerator Res Org, KEK, Oho, Ibaraki 3050801, Japan

[5] European Synchrotron ESRF, F-38000 Grenoble, France

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2015年 / 28卷 / 06期

基金：

欧盟第七框架计划; 美国国家科学基金会;

关键词：

Bi-2212; overpressure; critical current; XRD; stress; strain; THERMAL-EXPANSION; TEMPERATURE; DEPENDENCE; TEXTURE; BI2212;

D O I：

10.1088/0953-2048/28/6/062002

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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 I-c 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.

引用

页数：8

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