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Phase evolution in Ba–(Nd,Eu,Gd)–Cu–O-coated conductor films

Published online by Cambridge University Press:  31 January 2011

W. Wong-Ng ,
I. Levin ,
J. Ritter ,
L.P. Cook ,
G. Liu ,
M. Otani ,
M. Vaudin ,
C. Lucas ,
S.P. Diwanji  and
R. Feenstra
W. Wong-Ng*
Affiliation:
Materials Science and Engineering Laboratory, National Institutes of Standards and Technology, Gaithersburg, Maryland 20899
I. Levin
Affiliation:
Materials Science and Engineering Laboratory, National Institutes of Standards and Technology, Gaithersburg, Maryland 20899
J. Ritter
Affiliation:
Materials Science and Engineering Laboratory, National Institutes of Standards and Technology, Gaithersburg, Maryland 20899
L.P. Cook
Affiliation:
Materials Science and Engineering Laboratory, National Institutes of Standards and Technology, Gaithersburg, Maryland 20899
G. Liu
Affiliation:
Materials Science and Engineering Laboratory, National Institutes of Standards and Technology, Gaithersburg, Maryland 20899
M. Otani
Affiliation:
Materials Science and Engineering Laboratory, National Institutes of Standards and Technology, Gaithersburg, Maryland 20899
M. Vaudin
Affiliation:
Materials Science and Engineering Laboratory, National Institutes of Standards and Technology, Gaithersburg, Maryland 20899
C. Lucas
Affiliation:
Chemistry Department, University of Maryland, College Park, Maryland 20742
S.P. Diwanji
Affiliation:
Chemistry Department, University of Maryland, College Park, Maryland 20742
R. Feenstra
Affiliation:
Materials Science & Engineering Laboratory, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
*
a)Address all correspondence to this author. e-mail: winnie.wong-ng@nist.gov
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Abstract

Phases that are in equilibrium with BaR2CuO6+x (R=lanthanides and Y), such as the “green-phase” and “brown-phase” structural variants of BaR2CuO5 in bulk samples, are attractive choices for flux-pinning for coated conductor applications because of the guaranteed chemical stability. In films, high-temperature x-ray diffraction studies of Ba2RCu3O6+x superconductor deposited on SrTiO3 substrate using the trifluoroacetate solution method demonstrate that while BaNd2CuO5 (“brown-phase” structure) develops at 735 °C and 100 Pa pO2, neither BaGd2CuO5 nor Ba(Nd1/3Eu1/3Gd1/3)2CuO5 (both green-phase structure) form at these conditions. As a result, Ba2(Nd1/3Eu1/3Gd1/3)Cu3O6+x in thin films is in equilibrium with the brown-phase, and Ba2GdCu3O6+x is in equilibrium with Gd2O3 in the Ba–Gd–Cu–O system, in contrast to the bulk systems. Different phase relationships in the vicinity of the Ba2RCu3O6+x phase imply different phases are available for flux-pinning applications. These differences will need to be considered carefully in designing optimized superconducting coated conductors.

Keywords

Electronic materialPhase equilibriaSuperconducting
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 8 , August 2008 , pp. 2067 - 2071
Copyright
Copyright © Materials Research Society 2008

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