Flux pinning enhancement in Ag-clad Bi-2212 wires by reactive doping with barium peroxide

Author

Trociewitz, U.P. ; Sastry, P.V.P.S.S. ; Sahm, P.R. ; Schwartz, J.

Author_Institution

Nat. High Magnetic Field Lab., Florida State Univ., Tallahassee, FL, USA

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

1828

Lastpage

1831

Abstract

Reactive additions of barium peroxide to Bi-2212 are shown to create homogeneously distributed second phases and enhance flux pinning properties. Changes in the melting characteristics caused by the addition also influence the texture of melt-processed Bi-2212 tapes. Heat treatment processes were adjusted corresponding to the Ba content to optimize the critical current densities in high magnetic fields. Results of investigations on microstructural, magnetization, and transport properties were correlated with flux pinning characteristics. Significant improvements in the field dependence of the superconducting properties of Bi-2212 at temperatures between 4.2-10 K were demonstrated.

Keywords

bismuth compounds; calcium compounds; critical current density (superconductivity); flux pinning; high-temperature superconductors; silver; strontium compounds; superconducting tapes; 4.2 to 10 K; Ag-clad Bi-2212 wires; BaO/sub 2/; Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8/-Ag; barium peroxide; critical current densities; flux pinning enhancement; high temperature superconductor; homogeneously distributed second phases; melting characteristics; reactive doping; texture; Barium; Critical current density; Flux pinning; Heat treatment; Magnetic fields; Magnetic properties; Magnetization; Superconducting films; Temperature dependence; Wires;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.784812

Filename

784812