Abstract
This study confirms the retention phenomenon of nitrogen during the oxidation of γ aluminium oxynitride up to 1400°C. ESCA spectroscopy analysis of oxidised samples shows that the nitrogen is discharged during the reaction; its electronic state is nearly the same as that of atomic nitrogen. The structure of aluminium oxynitride and that of its oxidised product have been established by neutron diffraction. The γ Aluminium oxynitride phase presents an ideal spinel structure with disordered cationic vacancies in octahedral sites. Its oxidised product, so called γ′ alumina, also has a spinel structure with nitrogen atoms discharged in the anionic sites and cationic vacancies in the octahedral sites.
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