Mechanism of water dissolution in sodium-silicate melts and glasses: Structural interpretation of spectroscopic data

Autor:	T. P. Salova, V. O. Zavelsky, A. G. Simakin
Rok vydání:	2008
Předmět:	chemistry.chemical_compound Crystallography 1h nmr spectroscopy Geophysics Geochemistry and Petrology Chemistry 23na nmr Physical chemistry Sodium silicate Hydrate Dissolution Silicate glass
Zdroj:	Geochemistry International. 46:107-115
ISSN:	1556-1968 0016-7029
DOI:	10.1134/s0016702908020018
Popis:	Sodium-silicate glasses with varying water contents were studied by 23Na NMR and 1H NMR spectroscopy. The 23Na NMR spectrum is made up of two Gaussian-Lorentzian components corresponding to rigidly bound and free Na ions. The rigidly bound Na is allocated in the disilicate-like domains corresponding to Q3 species of sodium-silicate glasses. Unbound Na is associated with Q2 and Q1 species. It was shown that, during water dissolution, some hydroxyls are incorporated into the disilicate unit of the structure to form NaHSi2O5, while others hydrate silica (Q4species). Our 23Na NMR data are consistent with available data on Q speciation and the proportions of water species in sodium-silicate glasses in the frameworks of a proposed detailed structural scheme of water dissolution.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c10aa38c08d3f1641fddcd155e5e5320 https://doi.org/10.1134/s0016702908020018 Zobrazit plný text záznamu Full text from SpringerLink