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A transmission electron microscopy study of the crystallinity and secondary phase formation in melt-processed YBa2Cu3O7−δ

Published online by Cambridge University Press:  31 January 2011

Y. Yan ,
D. A. Cardwell ,
A. M. Campbell  and
W. M. Stobbs
Y. Yan
Affiliation:
IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United Kingdom
D. A. Cardwell
Affiliation:
IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United Kingdom
A. M. Campbell
Affiliation:
IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United Kingdom
W. M. Stobbs
Affiliation:
Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge, CB2 3QZ, United Kingdom
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Abstract

The microstructure of large grain melt-processed YBa2Cu3O7−δ containing 10 molar% excess Y2BaCuO5 prepared and oxygenated under atmospheric pressure has been investigated by transmission electron microscopy (TEM) and optical microscopy. These materials always contain parallel structural and microscopic platelet-like features in the crystallographic a-b plane of a few microns spacing which have been variously described as grain boundaries or microcracks. We have observed such features, which clearly influence the flow of current in melt-processed YBCO, to consist of copper deficient, impurity phase material which can be either amorphous or crystalline in nature. A variety of defects have been observed by high-resolution electron microscopy (HREM) in the vicinity of these platelet boundaries, including double and triple CuO layer stacking faults, which may constitute effective flux pinning sites.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 12 , December 1996 , pp. 2990 - 2999
Copyright
Copyright © Materials Research Society 1996

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