Abstract
Geometric modelling of orientational domain interfaces in YBa 2Cu 3O 7− x indicate that dislocations extending from the interface must be present in order to accomodate the lattice mismatch there. The variation of dislocation density with oxygen stoichiometry and interfacial orientation has been determined. For the first time, the effect of oxygen stoichiometry on the interfacial structure and properties of YBa 2Cu 3O 7− x has been modelled. Stereochemical modelling of these dislocations indicates that they are likely sites where both the localization of copper (II) holes and the degradation of superconducting properties may occur.
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