Dissolution Behavior of Ternary Alkali-Alkaline Earth-Borate Glasses in Water

Abstract

The compositional dependence of the dissolution rates of ternary alkali-alkaline earth borate glasses in water were characterized. These glasses dissolve congruently and the dissolution kinetics were linear, following the contracting volume model for spherical particles. The dissolution rates were dependent on the glass structure, with slower rates associated with glasses with greater fractions of four-coordinated borate sites in their network structures, as determined by nuclear magnetic resonance spectroscopy. For glasses with a fixed alkaline earth identity, the dissolution rates increased in the order Li < Na < K. For glasses with a constant alkali identity, the dissolution rates increased in the order Ca < Sr ≈ Mg. The effects of composition on dissolution rates are discussed in terms of the reactions between water and different borate and metal-oxide sites in the glass structure.

Department(s)

Materials Science and Engineering

Comments

This work was supported by a "Graduates in Areas of National Need" (GAANN) fellowship from the US Department of Education (grant number P200A090048).

Keywords and Phrases

Borate Glass; Dissolution; Hydration; Hydrolysis

International Standard Serial Number (ISSN)

0022-3093

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2018 Elsevier B.V., All rights reserved.

Publication Date

01 May 2018

Link to Full Text

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