Evidence for local composition variations within YBa2Cu3O7−δ grain boundaries
- 24 July 1989
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 55 (4) , 393-395
- https://doi.org/10.1063/1.102422
Abstract
The composition variations associated with grain boundaries in bulk sintered YBa2Cu3O7−δ have been investigated by means of energy‐dispersive x‐ray microanalysis in a high spatial resolution scanning transmission electron microscope. A series of composition profiles indicates that considerable variations in composition occur on a very local scale both parallel and perpendicular to these grain boundaries. The regular, oscillatory (period ∼25 nm) nature of the composition variations observed along a grain boundary suggests that these heterogeneities may be an intrinsic feature of the boundary. Some possible implications of these observations for percolative conduction mechanisms are discussed briefly.Keywords
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