Abstract
A study of the optical domain and twin structure in single crystals of YBa 2Cu 3O 7-δ has shown the presence of interesting features of the microstructure in regions where two sets of orthogonal twins intersect. The observed features are interpreted in terms of a simple model in which the resultant microstructure of the intersection region is related directly to the oxygen ordering, and hence to the orthorhombic strain in the individual optical domains. It is shown that the detailed structure might be anticipated on energetic grounds. Convergent beam electron diffraction (CBED) techniques have been used to establish the variations in structure in this area.
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