A generic name for compounds or solid solutions in the system
M–Si–Al–O–N where
M is a metal. (The use of capitals as in SiAlON is discouraged since they suggest a chemical composition.)
Source:
PAC, 1999, 71, 1765. 'Terminology for compounds in the Si-Al-O-N system' on page 1767 (https://doi.org/10.1351/pac199971091765)