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Experimental investigation of the Y2BaCuO5 surface free energy during peritectic solidification of YBCO

Published online by Cambridge University Press:  31 January 2011

Wai Lo ,
D. A. Cardwell ,
J. C. L. Chow  and
H-T. Leung
Wai Lo
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
J. C. L. Chow
Affiliation:
IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom
H-T. Leung
Affiliation:
IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom
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Abstract

The characteristic inhomogeneous distribution of nonsuperconducting Y2BaCuO5 (211) inclusions in melt-processed YBa2Cu3O7−δ (123) grains has generally been attributed to 211 particle pushing by 123 growth fronts during peritectic solidification on the basis of reduced total surface free energy. Analysis of the morphology of the interfaces at the 211–211–123 and 211–211-liquid triple points in seeded melt-processed samples invalidates this assumption for the pure YBCO system and has implications of the mechanism of 211 particle segregation.

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Articles
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Journal of Materials Research , Volume 13 , Issue 8 , August 1998 , pp. 2035 - 2038
Copyright
Copyright © Materials Research Society 1998

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