Enhancement of the 77 K irreversibility field and critical current density of (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital x}} tapes by manipulation of the final cooling rate
- Applied Superconductivity Center and Materials Science Program, University of Wisconsin, Madison, Wisconsin 53706 (United States)
- American Superconductor Corporation, Westborough, Massachusetts 01581 (United States)
By manipulating the cooling rate from the final heat treatment, we have raised the 77 K, self-field critical current density ({ital J}{sub {ital c}}) of multifilament (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital x}} (2223) tapes by a factor of 3, and the irreversibility field ({ital H}{asterisk}) by more than 50{percent}. The {ital J}{sub {ital c}} of samples cooled in 7.5{percent} O{sub 2} from their reaction temperature of 825{degree}C increased from {approximately}8 to {approximately}24 kA/cm{sup 2} and {ital H}{asterisk}(77 K) increased from {approximately}120 to {approximately}200 mT as the cooling rate was decreased from 5 to 0.016{degree}C/min. The results unambiguously show that the flux pinning properties of 2223 tapes can be improved by simple changes in wire processing. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 391721
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 19 Vol. 69; ISSN 0003-6951; ISSN APPLAB
- Country of Publication:
- United States
- Language:
- English
Similar Records
The effect of lead content on the critical current density, irreversibility field, and microstructure of Ag-clad Bi{sub 1.8}Pb{sub x}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub y} tapes
Evolution of the transport critical current density and irreversibility field as a function of heat treatment and pressing pressure during processing of Ag-sheathed (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub x} tapes