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The effect of lead content on the critical current density, irreversibility field, and microstructure of Ag-clad Bi1.8PbxSr2Ca2Cu3Oy tapes

Published online by Cambridge University Press:  31 January 2011

J. W. Anderson ,
S. E. Dorris ,
J. A. Parrell  and
D. C. Larbalestier
J. W. Anderson
Affiliation:
Applied Superconductivity Center and Materials Science Program, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, Wisconsin 53706
S. E. Dorris
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
J. A. Parrell
Affiliation:
Applied Superconductivity Center and Materials Science Program, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, Wisconsin 53706
D. C. Larbalestier
Affiliation:
Applied Superconductivity Center and Materials Science Program, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, Wisconsin 53706
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Abstract

We studied the effect of lead content (x = 0.20−0.40) on the critical current density Jc (0 T, 77 K), irreversibility field H* (77 K), and microstructure of monocore, Ag-clad Bi1.8PbxSr2Ca2Cu3Oy (2223) tapes, finding that tapes with lower lead contents (x = 0.20–0.25) required higher processing temperatures (840 and 832 °C, respectively) to complete 2223 formation, as compared to the optimum 820 °C reaction temperature of the x = 0.30–0.40 tapes. We found that both the zero-field and the in-field properties correlated strongly to the phase purity with Jc (0 T, 77 K) reaching a maximum of ˜20 kA/cm2 for x = 0.30, and then decreasing with increasing lead content to ˜12 kA/cm2 for x = 0.40. H* (77 K) increased from ˜165 mT at x = 0.20 to ˜265 mT at x = 0.30, then declined to 195 mT at x = 0.40. Optimizing the lead content at x = 0.30 maximized both the connectivity and the flux pinning contributions to the critical current density.

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Articles
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Journal of Materials Research , Volume 14 , Issue 2 , February 1999 , pp. 340 - 348
Copyright
Copyright © Materials Research Society 1999

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