Abstract
The structure of low angle tilt boundaries in NiO was studied using an electron microscope technique that is sensitive to the change in mean inner potential at the core of dislocations. The two boundaries examined were both faceted, one in particular having a complex dislocation content in facets with a period of ~ 8.8 nm. Using the experimentally determined rotation axis, angle and boundary plane, Bollmann's O-lattice theory was applied to determine the geometry and dislocation content of the facets. The predictions of the theoretical analysis were in excellent agreement with all details of the observed geometry and dislocation content, demonstrating that Bollmann's theory is valid to predict the detailed structure of tilt boundaries in NiO. It is suggested that in NiO a tilt boundary with an arbitrary rotation axis will be faceted.
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