The Y-Si-O-N Oxynitrides

Early studies onthe YN-Si3N4 system have identified three ternary compounds [17] which, on the basis of very poor-quality multiphase samples, were tentatively attributed to compositions YgSijNio, Y2Si3N6, and YSi3Ns. Subsequent detailed 

Since their original discovery in 1978 [21], there have been many crystal structure determinations on a variety of different a-sialons. a-Sialon can incorporate the additional large cations (M) required for the stabilization of its structure, because the 

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