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Spatial variations in composition in high-critical-current-density Bi-2223 tapes

Published online by Cambridge University Press:  31 January 2011

T. G. Holesinger ,
J. F. Bingert ,
M. Teplitsky ,
Q. Li ,
R. Parrella ,
M. P. Rupich  and
G. N. Riley Jr.
T. G. Holesinger
Affiliation:
MST-6, Metallurgy Group, Materials Science Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
J. F. Bingert
Affiliation:
MST-6, Metallurgy Group, Materials Science Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
M. Teplitsky
Affiliation:
American Superconductor Corporation, Westborough, Massachusetts 01581
Q. Li
Affiliation:
American Superconductor Corporation, Westborough, Massachusetts 01581
R. Parrella
Affiliation:
American Superconductor Corporation, Westborough, Massachusetts 01581
M. P. Rupich
Affiliation:
American Superconductor Corporation, Westborough, Massachusetts 01581
G. N. Riley Jr.
Affiliation:
American Superconductor Corporation, Westborough, Massachusetts 01581
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Abstract

A detailed compositional analysis of high-critical-current-density (Jc) (55 and 65 kA/cm2 at 77 K) (Bi,Pb)2Sr2Ca2Cu3Oy (Bi-2223) tapes was undertaken by energy dispersive spectroscopy in the transmission electron microscope. Structural features were coupled with characteristic compositions of the Bi-2223 phase. The average of all compositional measurements of the Bi-2223 phase was determined to be Bi1.88Pb0.23Sr1.96Ca1.95Cu2.98Oy. However, spatial variations in the Bi-2223 composition and differing phase equilibria were found throughout the filament structure. In particular, a considerable range of Bi-2223 compositions can be found within a single tape, and the lead content of the Bi-2223 phase is significantly depressed in the vicinity of lead-rich phases. The depletion of lead in the Bi-2223 phase around the 3221 phases may be a current-limiting microstructure in these tapes.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 2 , February 2000 , pp. 285 - 295
Copyright
Copyright © Materials Research Society 2000

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