Structural modifications induced by Na+/K+ ion exchange in silicate glasses: A multinuclear NMR spectroscopic study
Source abstract
Abstract
Abstract The structural mechanisms of stress relaxation during Na + /K + ion exchange is studied in a variety of Na silicate glasses with and without alkaline-earth modifiers, using one and two-dimensional 23 Na and 29 Si nuclear magnetic resonance (NMR) spectroscopy. The results suggest that significant structural modifications accompany the Na + /K + ion exchange process in the form of a shortening of the average Na O and Si NBO distances and an opening of the Si O Si angles without any detectable change in the Q n speciation. These trends are similar to those observed in analogous mixed Na,K glasses derived via the melt-quench route, with increasing K:Na ratio. Consequently, the ion-exchange-induced reorganization of the glass network is accompanied by a partial relaxation of the stress generated by the exchange of smaller Na + by the larger K + and better accommodation of the latter ion as a modifier.
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Research context
OpenAlex topics: Glass properties and applications · Phase-change materials and chalcogenides · Material Dynamics and Properties
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