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The effects of variable oxygen partial pressures during Bi-2223 tape processing

Published online by Cambridge University Press:  31 January 2011

T. G. Holesinger,
J. F. Bingert,
J. O. Willis,
V. A. Maroni,
A. K. Fischer and
K. T. Wu
T. G. Holesinger
Affiliation:
MST-6, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
J. F. Bingert
Affiliation:
MST-6, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
J. O. Willis
Affiliation:
Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
V. A. Maroni
Affiliation:
Chemical Science and Technology, Argonne National Laboratory, Argonne, Illinois 60521
A. K. Fischer
Affiliation:
Chemical Science and Technology, Argonne National Laboratory, Argonne, Illinois 60521
K. T. Wu
Affiliation:
State University of New York/Old Westbury Campus, Old Westbury, New York 11568
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Abstract

The effect of changes in the oxygen partial pressure during the heat treatment of Bi-2223 tapes has been investigated. Distinct differences were observed in the phase assemblages, compositions, and critical current densities. Of particular importance in the correlation of transport properties and microstructure was the redistribution of lead in both the secondary phases and the Bi-2223 matrix. The highest Jc values were associated with tapes that contained Ca2PbO4 as part of the phase assemblage coupled with lower concentrations of lead in the superconducting phase. The high Jc of 30.4 kA/cm2 was obtained in tapes processed at 820 °C where the oxygen partial pressure was increased from 10% O2/Ar to 20% O2/Ar after 25 h of each 50-h sinter cycle. Samples processed only in 10% O2/Ar at 820 °C did not contain Ca2PbO4, had slightly higher concentrations of lead in the superconducting phase, and had significantly lower Jc values.

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Articles
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Journal of Materials Research , Volume 12 , Issue 11 , November 1997, pp. 3046 - 3054
Copyright
Copyright © Materials Research Society 1997

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References

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