High-resolution transmission electron microscopy study of the φ′- and δ-AlON spinel phases of the pseudo-binary section AlN–Al2O3

A previously proposed structural model [Tabary & Servant (1999).J. Appl. Cryst.32, 253–272] for the φ′- and δ-AlON spinel phases, which allows for the double modulation of composition and displacement of cations and anions and which describes both phases and their relationships to the γ-AlON spinel phase, is here supported by high-resolution electron microscopy observations.