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Phase transformations in gel-derived and mixed-powder-derived yttrium disilicate, Y2Si2O7, by X-ray diffraction and 29Si MAS NMR

Lookup NU author(s): Emeritus Professor Derek Thompson

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Abstract

The different polymorphs of Y2Si2O7 have been synthesized by a sol-gel process and by mixed-powder routes. Their ranges of stability are discussed as a function of heat-treatment and synthesis route. It appeared that amorphous sol-gel samples crystallized according to the sequence amorphous → α → β → γ, even when isothermal heat-treatments were performed, regardless of temperature. It is proposed that preferential crystallization of α is related to the type of silicon structural units in the starting amorphous precursor similar to α phase. High-resolution 29Si NMR spectra (linewidth ≤ 21 Hz) are reported for the α, β, γ, and δ, polymorphs which are consistent with accepted structural data from the point of view of the number of sites, the populations, and the relative chemical shifts. (C) 2000 Academic Press.

Publication metadata

Author(s): Parmentier J, Bodart PR, Audoin L, Massouras G, Thompson DP, Harris RK, Goursat P, Besson J-L

Publication type: Article

Publication status: Published

Journal: Journal of Solid State Chemistry

Year: 2000

Volume: 149

Issue: 1

Pages: 16-20

ISSN (print): 0022-4596

ISSN (electronic): 1095-726X

Publisher: Academic Press

URL: http://dx.doi.org/10.1006/jssc.1999.8474

DOI: 10.1006/jssc.1999.8474

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