Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7900384 | Journal of Non-Crystalline Solids | 2018 | 8 Pages |
Abstract
μ-XANES is used to study the modifications in the alkali and alkaline-earth environments induced by the Na+/K+ ion-exchange process in various Na -silicate glasses. The results indicate that the ion-exchange process induces a shortening of the NaO, CaO and MgO bond distances. The contraction of the NaO, CaO and MgO coordination shell allows a better accommodation of the K+ cations in the glass network and thereby leads to partial relaxation of the stress developed by the Na+/K+ ion-exchange. Nevertheless, despite the stress relaxation process, the K+ environment in the ion-exchanged glass is not equivalent to the one in Na,K-silicate as-melted glasses. Hence, this study clearly shows that the ion swapping forced K+ cations to occupy smaller sites which are not achievable via the melt quench route for glasses with the same K amount.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
C. Ragoen, L. Cormier, A.-I. Bidegaray, S. Vives, F. Henneman, N. Trcera, S. Godet,