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Multinuclear magnetic resonance study of Li2OSiO2 SolGel glasses

✍ Scribed by Raymond Dupree; Diane Holland; Mohamed Golam Mortuza; Mark Edmund Smith; Aihu Chen; Peter F. James

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
769 KB
Volume
28
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

A multinuclear magnetic resonance study of some solgel prepared Li~2~OSiO~2~ glasses and of their crystallization is presented. The glasses, all of which have been heated to 400°C, are found to contain a large amount (ca. 20 mol‐%) of H~2~O, mostly in the form of OH. The local structure is very different from melt‐formed glasses in that the major modifier is H~2~O rather than Li~2~O, with the formation of Si(OSi)~3~OH units. The glasses start to crystallize at a lower temperature than melt‐formed glasses, with the first crystalline product being lithium metasilicate even for very silica rich sol‐gel compositions.

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