Spatial variations in composition in high-critical-current-density Bi-2223 tapes
Journal Article
·
· Journal of Materials Research
- MST-6, Metallurgy Group, Materials Science Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
- American Superconductor Corporation, Westborough, Massachusetts 01581 (United States)
A detailed compositional analysis of high-critical-current-density (J{sub c}) (55 and 65 kA/cm2 at 77 K) (Bi, Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub y} (Bi-2223) tapes was undertaken by energy dispersive spectroscopy in the transmission electron microscope. Structural features were coupled with characteristic compositions of the Bi-2223 phase. The average of all compositional measurements of the Bi-2223 phase was determined to be Bi{sub 1.88}Pb{sub 0.23}Sr{sub 1.96}Ca{sub 1.95}Cu{sub 2.98}O{sub y}. However, spatial variations in the Bi-2223 composition and differing phase equilibria were found throughout the filament structure. In particular, a considerable range of Bi-2223 compositions can be found within a single tape, and the lead content of the Bi-2223 phase is significantly depressed in the vicinity of lead-rich phases. The depletion of lead in the Bi-2223 phase around the 3221 phases may be a current-limiting microstructure in these tapes. (c) 2000 Materials Research Society.
- OSTI ID:
- 20216015
- Journal Information:
- Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 2 Vol. 15; ISSN JMREEE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
Similar Records
Lead-rich phases in partially processed Ag/Bi-2223 composite conductors
The effect of processing on the microstructure of Ag-sheathed Bi-2223 wires
Controlled decomposition and reformation of the 2223 phase in Ag-clad (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital x}} tapes and its influence on the microstructure and critical current density
Conference
·
Wed Jan 31 23:00:00 EST 1996
·
OSTI ID:226421
The effect of processing on the microstructure of Ag-sheathed Bi-2223 wires
Conference
·
Sun Oct 31 23:00:00 EST 1993
·
OSTI ID:10110430
Controlled decomposition and reformation of the 2223 phase in Ag-clad (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital x}} tapes and its influence on the microstructure and critical current density
Journal Article
·
Thu Feb 29 23:00:00 EST 1996
· Journal of Materials Research
·
OSTI ID:279739