Enhancement of critical currents in bulk and Ag-sheathed Bi(Pb)-2223 superconductors

Author

Brauer, D.J. ; Eujen, R. ; Hudepohl, J.

Author_Institution

Anorganische Chem., Bergische Univ. GH, Wuppertal, Germany

Volume

27

Issue

2

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

1105

Lastpage

1107

Abstract

The superconducting properties of the Bi(Pb)-2223 phase have been optimized. Prolonged annealing of coarse powder raised the j_c in bulk samples to as high as 1100 A-cm^-2 at 77 K. The temperature dependence between 96 and 4.2 K was studied, where j_c rose gradually from 120 to 2100 A-cm^-2. T_c dropped from 107 K to 64 K in magnetic fields up to 4 T, but decreased by only 1 K/T in higher fields. A tape prepared by rolling and subsequent annealing of Ag tubes containing Bi(Pb)2223 powder exhibited a j_c of 1700 A-cm^-2 at 77 K and 11000 A-cm^-2 at 4.2 K. The latter j_c dropped to 3000 A-cm^-2 in a magnetic field of 0.25 T, but it was still 1200 A-cm^-2 in a 10-T field. A tape fabricated by pressing a drawn and annealed wire proved to be less sensitive to low magnetic fields

Keywords

annealing; bismuth compounds; calcium compounds; critical current density (superconductivity); high-temperature superconductors; lead compounds; powders; strontium compounds; superconducting transition temperature; 107 to 64 K; 4.2 to 96 K; Ag tubes; Ag-sheathed Bi(Pb)-2223 superconductors; BiPbSrCaCuO; annealing; bulk samples; coarse powder; critical currents; high temperature superconductivity; pressing; rolling; tape; temperature dependence; transition temperature; wire; Annealing; Crystalline materials; High temperature superconductors; Magnetic fields; Magnetic materials; Powders; Pressing; Silver; Superconductivity; Temperature dependence;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.133374

Filename

133374