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Multinuclear magnetic resonance study of Li 2 OSiO 2 SolGel glasses
Author(s) -
Dupree Raymond,
Holland Diane,
Mortuza Mohamed Golam,
Smith Mark Edmund,
Chen Aihu,
James Peter F.
Publication year - 1990
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260281315
Subject(s) - chemistry , crystallization , sol gel , silica glass , lithium (medication) , crystallography , mineralogy , chemical engineering , organic chemistry , materials science , composite material , medicine , engineering , endocrinology
Abstract A multinuclear magnetic resonance study of some solgel prepared Li 2 OSiO 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.