Development and performance characteristics of Bi-2212/Ag superconducting wires

Author

Wesche, R. ; Jakob, B. ; Pasztor, G.

Author_Institution

Paul Scherrer Inst., Villigen, Switzerland

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

927

Lastpage

930

Abstract

A series of Bi-2212/Ag composite wires have been fabricated by the ´powder in tube´ method. Heat treatment studies have been performed to investigate their effect on superconducting properties. The critical current density was found to be strongly influenced by the phase composition of the calcined powder. The wires with T/sub c/ of 85 K reached at 4.2 K j/sub c/ values up to 66500 A/cm/sup 2/ (0 T). The index of resistive transition n was found to correlate with the critical current density, suggesting that n could be useful as an indicator of microstructural inhomogeneities. Since practical applications require stability of the superconducting phase, measurements of the effect of aging and thermal shocks on j/sub c/ were made and are discussed.<>

Keywords

ageing; bismuth compounds; calcium compounds; composite superconductors; critical current density (superconductivity); crystal microstructure; heat treatment; high-temperature superconductors; silver; stoichiometry; strontium compounds; superconducting transition temperature; superconductive tunnelling; thermal shock; 4.2 to 85 K; Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub x/-Ag; aging; calcined powder; composite wires; critical current density; heat treatment; high temperature superconductivity; microstructural inhomogeneities; phase composition; powder in tube method; resistive transition; thermal shocks; Aging; Critical current density; Current density; Electric shock; Magnetic fields; Powders; Superconducting filaments and wires; Superconducting magnets; Superconductivity; X-ray diffraction;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233847

Filename

233847