THE ROLE OF SODIUM IN THE MECHANISM OF INTERACTION OF SODIUM SILICATE MELT WITH AQUEOUS FLUID: EVIDENCE FROM 1H AND 23NA NMR
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dc.contributor.author | Zavel'sky V.O. | |
dc.contributor.author | Salova T.P. | |
dc.date.accessioned | 2021-02-22T07:47:26Z | |
dc.date.available | 2021-02-22T07:47:26Z | |
dc.date.issued | 2001 | |
dc.identifier | https://elibrary.ru/item.asp?id=13378468 | |
dc.identifier.citation | Geochemistry International, 2001, 39, 8, 748-754 | |
dc.identifier.issn | 0016-7029 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/25412 | |
dc.description.abstract | Sodium silicate melts of the composition Na2O · RSiO2 (R = 3, 4) with varying water contents were studied by 1H and 23Na NMR. It was found that Na+ occurs in sodium silicate melt in two coordinations: (1) covalently bonded to oxygen in the fragment Si-O-Na and (2) incorporated into an oxygen niche formed by bridging oxygens with their unshared electron pairs. Water-melt interaction results in at least the partial dissociation of water molecules. Owing to its higher acidity, a hydrogen ion, H+, replaces Na+ from the bond Si-O-Na into an oxygen niche forming the bond Si-OH. Comparison of the NMR spectra of hydrous quartz and sodium silicate glasses allows us to suppose that Na+ defines the mechanism of interaction of the sodium silicate melt and aqueous fluid. The Na+ ions of the second type serve as coordination centers for water molecules. | |
dc.title | THE ROLE OF SODIUM IN THE MECHANISM OF INTERACTION OF SODIUM SILICATE MELT WITH AQUEOUS FLUID: EVIDENCE FROM 1H AND 23NA NMR | |
dc.type | Статья |
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