Got, TL and Misra, S and Tipper, ET and Bohlin, MS and Guo, R and Farnan, I (2019) Diffusive processes in aqueous glass dissolution. In: npj Materials Degradation, 3 (1).
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Abstract
High level nuclear waste is often immobilised in a borosilicate glass for disposal. However, this glass corrodes in contact with aqueous solutions. To predict radionuclide releases from wasteforms, their dissolution mechanisms must be understood. Understanding glass dissolution mechanisms presents a challenge across numerous other disciplines and many glass dissolution models still remain conflicted. Here we show that diffusion was a significant process during the later stages of dissolution of a simplified waste glass but was not evidenced during the initial stages of dissolution. The absence of measurable isotopic fractionation in solution initially supports models of congruent dissolution. However, the solution becoming isotopically lighter at later times evidences diffusive isotopic fractionation and opposes models that exclude diffusive transport as a significant mechanism. The periodically sampled isotopic methodologies outlined here provide an additional dimension with which to understand glass dissolution mechanisms beyond the usual measurement of solution concentrations and, post-process, nano-scale analysis of the altered glass. © 2019, The Author(s).
| Item Type: | Journal Article |
|---|---|
| Publication: | npj Materials Degradation |
| Publisher: | Nature |
| Additional Information: | The copyright for this article belongs to the Authors. |
| Keywords: | Borosilicate glass; Isotopes; Nanotechnology; Solution mining; Waste disposal, Congruent dissolutions; Diffusive transport; Dissolution mechanism; High level nuclear wastes; Isotopic fractionations; Radionuclide release; Significant mechanism; Solution concentration, Dissolution |
| Department/Centre: | Division of Mechanical Sciences > Centre for Earth Sciences |
| Date Deposited: | 13 Oct 2022 05:57 |
| Last Modified: | 13 Oct 2022 05:57 |
| URI: | https://eprints.iisc.ac.in/id/eprint/77383 |
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