Hugoniot equation-of-state data of shock compressed aluminum oxynitride (AlON), consisting of 64.1 mol% AlN with a density of have been determined to 180 GPa. The relationship between shock velocity and particle velocity is expressed by a straight line: Although there is no evidence of phase transition in the data, the determined Hugoniot of AlON has been compared with those of oxide spinels such as and We discuss the systematics of high pressure phase transitions of spinels that indicate a phase transition to -type phases. The phase transition to -type structures implies that the recently discovered spinel also may be transformed into a -type phase with increasing pressure.
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