Crystalline and microstructure study of the AlN–Al2O3section in the Al–N–O system. II. φ′- and δ-AlON spinel phases

Abstract

Results from the crystalline and microstructure study of the φ′- and δ-AlON spinel phases by X-ray diffraction, neutron diffraction and standard-resolution transmission electron microscopy techniques are reported. Several samples having different compositions in mol % AlN were considered. A structural model is proposed to account for the double modulation of composition and displacement of the cations and anions, which has been determined for these two phases and for the relationship with the γ-AlON spinel phase. Some high-resolution transmission electron microscopy experiments have confirmed the present structural model. A discussion with reference to previous data is presented.