Study on the solid solubility of Al in the melilite systems R2Si3 − xAlxO3 + xN4 − x with R = Nd, Sm, Gd, Dy and Y

• Published in: Journal of the European Ceramic Society Vol. 15; no. 7; pp. 689 - 695
• Main Authors: Wang, P.L., Tu, H.Y., Sun, W.Y., Yan, D.S., Nygren, M., Ekström, T.
• Format: Journal Article
• Language: English
• Published: 01.01.1995
• ISSN: 0955-2219
• DOI: 10.1016/0955-2219(95)00026-Q

The solubility of aluminium in the nitrogen-containing melilite structure was studied by preparation of specimens by hot pressing and pressureless sintering techniques in the temperature interval 1600-1750 C. For elements with large ionic radii, i.e. R = Nd and Sm, up to one Si can be replaced by Al, but the solubility limits in melilite solid solutions decrease with decreasing ionic radii. Consequently, yttrium-melilite had the lowest observed aluminium solubility (x approximately equal to 0.6) in rare earth elements-melilite solid solutions. 12 refs.