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Critical Current Density of the AG-Clad BI-Based Superconductors

Published online by Cambridge University Press:  26 February 2011

S. X. Dou ,
Y. C. Guo  and
H. K. Liu
S. X. Dou
Affiliation:
School of Materials Science and Engineering, University of New South Wales, P. O. Box 1 Kensington, NSW 2033, Australia
Y. C. Guo
Affiliation:
School of Materials Science and Engineering, University of New South Wales, P. O. Box 1 Kensington, NSW 2033, Australia
H. K. Liu
Affiliation:
School of Materials Science and Engineering, University of New South Wales, P. O. Box 1 Kensington, NSW 2033, Australia
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Abstract

A high-Tc phase formation-decomposition-recovery process(PFDR) through the use of a short period of melting has been developed for fabrication of Ag-clad Bi-Pb-Sr-Ca-Cu-O (BPSCCO) wires. The weak links and flux pinning have been significantly improved and an extended plateau regime in the Jc-H curve has been observed. The PFDR processed tapes exhibit 3 to 10-fold increase in the Jc at 77 K and 1 Tesla over the normally processed tapes. A Jc of 40000 A/cm2 at 77 K and 0 T and 9000 A/cm2 at 77 K and 1 T have been achieved. The Jc correlates well with the degree of grain alignment which can be measured through the Jc dependence on the orientation of the applied field. The improved Jc - H characteristics is attributed to the desirable microstructures consisting of well aligned (Bi,Pb)2Sr2Ca2Cu3O10+y (2223) grains, fraction of (Bi,Pb)2Sr2CaCu2O8+y(2212) and high density of dislocations produced through PFDR process. The superconducting Ag/Bi-Pb-Sr-Ca-Cu-O wires can be made flexible. The Jc remains unchanged when wires of superconductor thickness 25 μm are bent to a strain rate of 1.5%

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 275: Symposium S – Layered Superconductors: Fabrication, Properties and Applications , 1992 , 683
Copyright
Copyright © Materials Research Society 1992

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References

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