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The microstructural evolution of a silver-containing spray deposited 1223 Tl–Ca–Ba–Cu oxide superconductor

Published online by Cambridge University Press:  03 March 2011

C.L. Briant,
J.A. DeLuca,
P.L. Karas,
M.F. Garbauskas,
J.A. Sutliff,
A. Goyal and
D. Kroeger
C.L. Briant
Affiliation:
Corporate Research and Development Center, General Electric Company, P.O. Box 8, Schenectady, New York 12301
J.A. DeLuca
Affiliation:
Corporate Research and Development Center, General Electric Company, P.O. Box 8, Schenectady, New York 12301
P.L. Karas
Affiliation:
Corporate Research and Development Center, General Electric Company, P.O. Box 8, Schenectady, New York 12301
M.F. Garbauskas
Affiliation:
Corporate Research and Development Center, General Electric Company, P.O. Box 8, Schenectady, New York 12301
J.A. Sutliff
Affiliation:
Corporate Research and Development Center, General Electric Company, P.O. Box 8, Schenectady, New York 12301
D. Kroeger
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
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Abstract

This paper reports a study of the microstructural evolution of Ag-containing 1223 Tl-Ca-Ba-Cu oxide superconductors in spray-deposited films. The films were formed by spray depositing nitrates of Ca, Ba, Cu, and Ag onto a polycrystalline yttria-stabilized zirconia substrate. These deposits were then converted to a mixture of oxides (calcia, calcium-copper oxide, and barium cuprate) and metallic silver by heating in oxygen. When thallium oxide vapor was passed over the film, the thallium was incorporated into the film and the 1223 phase was formed. The evidence strongly suggests that the development of the 1223 superconductor involves the formation of a liquid phase. Our analysis suggests that the initial phase to form a liquid is CaO which contains thallium, barium, copper, and silver. Once this initial liquid is formed, it incorporates more thallium which, in turn, allows it to dissolve other types of oxides present in the film. In this way the liquid spreads across the surface. The equilibrium 1223 phase precipitates from it.

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Type
Articles
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Journal of Materials Research , Volume 10 , Issue 4 , April 1995, pp. 823 - 842
Copyright
Copyright © Materials Research Society 1995

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