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

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...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 1995-01, Vol.15 (7), p.689-695
Main Authors: Wang, P.L., Tu, H.Y., Sun, W.Y., Yan, D.S., Nygren, M., Ekström, T.
Format: Article
Language:English
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Summary: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.
ISSN:0955-2219
DOI:10.1016/0955-2219(95)00026-Q