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The Morphology of Grain Boundary Interactions with Twins in YBa2Cu3O7−δ

Published online by Cambridge University Press:  21 February 2011

Jenn-Yue Wang  and
A. H. King
Jenn-Yue Wang
Affiliation:
Department of Materials Science & Engineering, State University of New York at Stony Brook, Stony Brook, NY 11794-2275, U. S. A.
A. H. King
Affiliation:
Department of Materials Science & Engineering, State University of New York at Stony Brook, Stony Brook, NY 11794-2275, U. S. A.
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Abstract

Various morphologies are observed where twins meet grain boundaries in YBa2Cu3O7−δ. Twins may be “correlated” at the boundary (i.e. twin boundaries from one grain may meet a twin boundary from the other grain in a quadruple junction) and the twins may be narrowed or “constricted” at the boundary. These effects are determined by the interfacial energy. We estimate the energy of the various interfaces by determining the dislocation arrays they contain, using the constrained coincidence site lattice (CCSL) model and Bollmann's O2-lattice formalism. Our approach indicates that there are significant changes in the energy of the interfaces and is thus able to explain the variety of observed morphologies.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 319: Symposia CB – Defect-Interface Interactions , 1993 , 227
Copyright
Copyright © Materials Research Society 1994

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