Abstract
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.
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