Phases formed in the Si3N4-rich corner of the Ce-Al-Si-O-N system

摘要

Extensive research has been performed on the phase relationships in many R-Si-Al-O-N (R = Y or rare earth elements) systems [1-4]. The Si- and N-rich regions of these systems are of special interest for materials design, because they comprise phases like α- and β-sialon and melilite [5]. The β-sialon phase (Si_(6-z)Al_zO_zN_(8-z), with z ≤ 4.2) coexists with different α-sialons, R_xSi_(12-(m+n))Al_(m+n)O_NN_(16-n), when R=Y and Ln elements with Z ≥ 60 [5, 6].