The phase relations in the Si3N4‐rich portion of the Si3N4–AlN–Y2O3 rystem were investigated using hot‐pressed bodies. The one‐phase fields of β3 and α, the twophase fields of β+α, β+M (M=melilite), and α+M, and the three‐phase fields of β+α+M were observed in the Si3N4‐rich portion. The α‐ and β‐sialons are not two different compounds but an allotropic transformation phase of the Si–Al–O–N system, and an α solid solution expands and stabilizes with increasing Y2O3 content. Therefore, the formulas of the two sialons should be the same.
|Journal||Journal of the American Ceramic Society|
|Publication status||Published - 1988 Jul|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry