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A two-powder process for Bi-2223 precursors

Published online by Cambridge University Press:  31 January 2011

T. G. Holesinger ,
K. V. Salazar ,
D. S. Phillips ,
B. L. Sargent ,
J. K. Bremser ,
J. F. Bingert ,
J. O. Willis  and
D. E. Peterson
T. G. Holesinger
Affiliation:
Superconductivity Technology Center, MS K763, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
K. V. Salazar
Affiliation:
Superconductivity Technology Center, MS K763, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
D. S. Phillips
Affiliation:
Superconductivity Technology Center, MS K763, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
B. L. Sargent
Affiliation:
Superconductivity Technology Center, MS K763, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
J. K. Bremser
Affiliation:
Superconductivity Technology Center, MS K763, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
J. F. Bingert
Affiliation:
Superconductivity Technology Center, MS K763, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
J. O. Willis
Affiliation:
Superconductivity Technology Center, MS K763, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
D. E. Peterson
Affiliation:
Superconductivity Technology Center, MS K763, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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Abstract

A two-powder process is described for the production of uniform, fine-grained Bi2Sr2Ca2Cu3Oy (Bi-2223) powders. One powder is the Bi2.1−xPbxSr1.9−yCayOz (2:2 Cu-free) phase. The other is a multi-phase powder of approximate overall composition SrCaCu3Oy. The 2:2 Cu-free is one of the first Bi-containing phases to form from a nominal Bi-2223 mixture of oxides and carbonates. This precursor route was chosen for investigation because (1) the powders have very similar particle morphologies and (2) the mixing volumes are closely matched. Both of these characteristics facilitate the milling and blending process. This precursor mix was found to be stable in that explosive grain growth of undesirable phases was not observed during sintering. Critical current densities up to 26,900 A/cm2 in self field at 75 K were obtained in tapes.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 1 , January 1996 , pp. 28 - 38
Copyright
Copyright © Materials Research Society 1996

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References

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