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Observations and implications of grain boundary dislocation networks in high-angle YBa2Cu3O7−δ grain boundaries

Published online by Cambridge University Press:  31 January 2011

S. E. Babcock  and
D. C. Larbalestier
S. E. Babcock
Affiliation:
Applied Superconductivity Center, University of Wisconsin, Madison, Wisconsin 53706
D. C. Larbalestier
Affiliation:
Applied Superconductivity Center and Department of Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706
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Abstract

Regular networks of localized grain boundary dislocations (GBDs) have been imaged by means of transmission electron microscopy in three different types of high-angle grain boundaries in YBa2Cu3O7-δ, implying that these boundaries possess ordered structures upon which a significant periodic strain field is superimposed. The occurrence of these GBD networks is shown to be consistent with the GBD/Structural Unit and Coincidence Site Lattice (CSL)/Near CSL descriptions for grain boundary structure. Thus, these dislocations appear to be intrinsic features of the boundary structure. The spacing of the observed GBDs ranged from ∼10 nm to ∼100 nm. These GBDs make the grain boundaries heterogeneous on a scale that approaches the coherence length and may contribute to their weak-link character by producing the “superconducting micro-bridge” microstructure which has been suggested on the basis of detailed electromagnetic measurements on similar samples.

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Journal of Materials Research , Volume 5 , Issue 5 , May 1990 , pp. 919 - 928
Copyright
Copyright © Materials Research Society 1990

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