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Water speciation in hydrous silicate and aluminosilicate glasses: Direct evidence from 29Si-1H and 27Al-1H double-resonance NMR
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Xianyu Xue
Published/Copyright:
April 1, 2015
Abstract
Through a combination of 1H MAS NMR, 1H → 29Si → 1H double cross-polarization (CP) MAS NMR and 27Al → 1H CP MAS NMR, different OH species [SiOH, AlOH, and (Ca,Mg)OH (free OH)] have been unambiguously identified for hydrous Ca,Mg-(alumino)silicate glasses. This confirms my earlier speciation assignments made partially on the basis of 1H chemical shift arguments. The dissolution mechanisms of water in both Al-free silicate and aluminosilicate glasses (quenched melts) are fundamentally similar. For relatively polymerized compositions, it involves dominantly the formation of TOH species (T: Si, Al) through the rupture of T-O-T linkages, in addition to molecular H2O; for more depolymerized compositions containing network-modifying cations of large field strength (e.g., Ca, Mg), free OH species are also important.
Received: 2008-9-10
Accepted: 2008-11-21
Published Online: 2015-4-1
Published in Print: 2009-2-1
© 2015 by Walter de Gruyter Berlin/Boston
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