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 · Fri Mar 01 04:00:00 EST 1996 · Journal of Materials Research

DOI:https://doi.org/10.1557/JMR.1996.0068· OSTI ID:279739

Parrell, J A; Feng, Y ^[1]; Dorris, S E ^[2]; Larbalestier, D C ^[3]

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1. Applied Superconductivity Center and Materials Science Program, University of Wisconsin---Madison, 1500 Johnson Drive, Madison, Wisconsin 53706 (United States)
2. Argonne National Laboratory, Energy Technology Division, Argonne, Illinois 60439 (United States)
3. Applied Superconductivity Center and Materials Science Program, University of Wisconsin---Madison, 1500 Engineering Drive, Madison, Wisconsin 53706 (United States)

The decomposition of almost fully reacted (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital x}} (BSCCO-2223) tapes caused by heating in 1 atm of pure O{sub 2} at 825{degree}C has been studied. It was found that partially decomposing 2223 tapes to a mixture of Bi{sub 2}Sr{sub 2}Ca{sub 1}Cu{sub 2}O{sub {ital y}}, (Ca,Sr){sub 2}PbO{sub 4}, and other secondary phases reduced the critical current density (77 K, 0 T) from {approximately}20 kA/cm{sup 2} to nearly zero. Reheating the tapes in 7.5{percent} O{sub 2} restored the 2223 phase and, while there was some degradation of the 2223 grain alignment due to residual secondary phase growth, the critical current density was also restored to nearly its original value. We hypothesize that such a decomposition/reformation process can be useful in increasing the connectivity of polycrystalline 2223, by encouraging the formation of a liquid phase which heals residual cracks in the BSCCO core. {copyright} {ital 1996 Materials Research Society.}

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 279739
• Journal Information: Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 3 Vol. 11; ISSN JMREEE; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
CRITICAL CURRENT
DECOMPOSITION
HIGH-TC SUPERCONDUCTORS
LEAD OXIDES
MICROSTRUCTURE
PHASE STUDIES
SILVER
STRONTIUM OXIDES
SUPERCONDUCTING FILMS
TEMPERATURE RANGE 1000-4000 K