Abstract
The solubility limit of α'‐SiAION solid solutions on the Si3N4─YN:3AIN composition join in the system Si3N4─YN─AIN has been determined at 1800°C. The end members of these solid solutions are Y0.43Si10.7Al1.3N16 and Y0.8Si9.6Al2.4N16. Unit‐cell dimensions of the α'‐SiAION solid solutions in the system Si,Al,Y/N,O can be expressed as follows: ao(Å) = 7.752 + 0.045m+ 0.009n, co(Å) = 5.620 + 0.048m+ 0.009n, where the α'‐SiAION solid solution has the formula YxSi12‐(m+n)Alm+nN16‐nOn. The single‐phase boundary of the solid solution α'‐SiAION on the composition triangle Si3N4─YN:3AIN─AIN:Al2O3 is delineated. The present paper also reports the phase relationships involving α'‐SiAION.
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