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
- Applied Superconductivity Center and Materials Science Program, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, Wisconsin 53706 (United States)
- Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
We studied the effect of lead content (xthinsp=thinsp0.20{endash}0.40) on the critical current density J{sub c}(0&hthinsp;T,77 K), irreversibility field H{sup {asterisk}}(77 K), and microstructure of monocore, Ag-clad Bi{sub 1.8}Pb{sub x}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub y} (2223) tapes, finding that tapes with lower lead contents (xthinsp=thinsp0.20{endash}0.25) required higher processing temperatures (840 and 832&hthinsp;{degree}C, respectively) to complete 2223 formation, as compared to the optimum 820&hthinsp;{degree}C reaction temperature of the xthinsp=thinsp0.30{endash}0.40 tapes. We found that both the zero-field and the in-field properties correlated strongly to the phase purity with J{sub c}(0&hthinsp;T,77 K) reaching a maximum of {approximately}20 kA/cm{sup 2} for x=0.30, and then decreasing with increasing lead content to {approximately}12 kA/cm{sup 2} for x=0.40. H{sup {asterisk}}(77 K) increased from {approximately}165 mT at xthinsp=thinsp0.20 to {approximately}265 mT at xthinsp=thinsp0.30, then declined to 195 mT at xthinsp=thinsp0.40. Optimizing the lead content at xthinsp=thinsp0.30 maximized both the connectivity and the flux pinning contributions to the critical current density. {copyright} {ital 1999 Materials Research Society.}
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 341167
- Journal Information:
- Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 2 Vol. 14; ISSN JMREEE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
HIGH-TC SUPERCONDUCTORS
LEAD COMPOUNDS
LEAD OXIDES
MAGNETIC FLUX
MAGNETIC PROPERTIES
MICROSTRUCTURE
OXYGEN COMPOUNDS
SILVER
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTING COMPOSITES
TEMPERATURE DEPENDENCE