Abstract
The ordered non-stoichiometric aluminum oxynitride spinel 9Al2O3–AlN has been investigated by X-ray diffraction and electron microscopy. This phase has a one-dimensional periodic antiphase-domain structure. The antiphase boundaries are parallel to the (001) plane and the displacement vector is R = ½〈100〉 when referred to the spinel structure. Periodically spaced clusters of tetrahedral vacancies are grouped in the neighbourhood of each antiphase boundary. These clusters occur in order to avoid an increase in the antiphase-boundary energy, which otherwise would arise, mainly as a result of the Coulomb repulsion between Al3+ ions displaced from their normal sites in the spinel lattice adjacent to the boundary.
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