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Grain boundary in textured YBa2Cu3O7−δ superconductor

Published online by Cambridge University Press:  31 January 2011

Yimei Zhu ,
H. Zhang ,
H. Wang  and
M. Suenaga
Yimei Zhu
Affiliation:
Division of Materials Science, Brookhaven National Laboratory, Upton, New York 11973
H. Zhang
Affiliation:
Department of Materials Science, State University of New York–Stony Brook, Stony Brook, New York 11794
H. Wang
Affiliation:
Department of Materials Science, State University of New York–Stony Brook, Stony Brook, New York 11794
M. Suenaga
Affiliation:
Division of Materials Science, Brookhaven National Laboratory, Upton, New York 11973
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Abstract

The misorientations of over 200 pairs of adjacent grains separated by grain boundaries in textured YBa2Cu3O7−δ were measured using a transmission electron microscopy technique. The results indicate that there exist discrete preferred rotation angles and rotation axes. The existence of low-energy boundaries is inferred. The results are analyzed based on the Constrained Coincidence Site Lattice (CCSL) and O2-lattice theories and imply the applicability of such theories for the case of large-angle grain boundaries in a complex crystal structure such as YBa2Cu3O7−δ. The results of analysis also show that some boundaries are likely to be reduced in oxygen near the boundary to satisfy the constraint of the coincidence site lattice.

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Articles
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Journal of Materials Research , Volume 6 , Issue 12 , December 1991 , pp. 2507 - 2518
Copyright
Copyright © Materials Research Society 1991

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