Article ID Journal Published Year Pages File Type
7900384 Journal of Non-Crystalline Solids 2018 8 Pages PDF
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
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