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Effect of thermally induced structural disorder on the chemical durability of International Simple Glass

Angeli F, Charpentier T, Jollivet P, de Ligny D, Bergler M, Veber A, Gin S, Li H (2018)

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Publication Language: English

Publication Type: Journal article, Online publication

Subtype: other

Publication year: 2018

Journal

Publisher: Nature Publishing Group

Book Volume: 2

Pages Range: 31

Journal Issue: 1

DOI: 10.1038/s41529-018-0052-3

Open Access Link: https://www.nature.com/articles/s41529-018-0052-3

Abstract

While the influence of silicate oxide glass composition on its chemical durability is increasingly known, the contribution of structure only is less well understood, yet is crucial for an accurate description of aqueous alteration mechanisms. The effect of structural disorder can be investigated by varying the thermal history of the glass. Furthermore, the structural changes generated by self-irradiation in nuclear glasses can be compared with those induced by fast quenching. In the context of deep geological disposal of vitreous matrices, it is then challenging to address the structural impact on glass durability. Here, a borosilicate glass, the International Simple Glass, was fiberized to obtain a rapidly quenched sample. The quenching rate and fictive temperature were evaluated from in situ Raman and Brillouin spectroscopies. Multinuclear nuclear magnetic resonance was used to obtain insight into the effect of quenching on the pristine and altered glass structure. Higher bond angle distribution and lower mixing of alkalis were observed in the fast quenched glass. Some of AlO4 groups are then Ca-compensated, while a part of BO4 is transformed into BO3 units. The structural modifications increase the hydrolysis of the silicate network occurring in the forward rate regime at 90 °C by a factor of 1.4–1.8 depending on the pH value. Residual rate regime is similarly affected, more significantly at the beginning of the experiments conducted in silica saturated solutions. These findings prove that the reactivity of glass remains controlled by its structure under the various alteration regimes. The structural changes induced by the rapid quenching of borosilicate glasses and their effects on chemical durability have been studied. Understanding how, and how fast, borosilicate glasses degrade is of great importance because they are often used as containment matrices for the disposal of radioactive waste. However, understanding how glass structure affects durability can be troublesome because both structural and compositional factors must be accounted for and are difficult to deconvolute. Now, a team, led by Frédéric Angeli at the CEA, Marcoule, France, have shown, using various spectroscopic techniques, how the effects of structural disorder can be investigated by varying the thermal history of a glass. The results show that this methodology can be used to investigate radiation damage in nuclear glasses, the effects of which are similar to those of quenching.

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APA:

Angeli, F., Charpentier, T., Jollivet, P., de Ligny, D., Bergler, M., Veber, A.,... Li, H. (2018). Effect of thermally induced structural disorder on the chemical durability of International Simple Glass. npj Materials Degradation, 2(1), 31. https://doi.org/10.1038/s41529-018-0052-3

MLA:

Angeli, Frederic, et al. "Effect of thermally induced structural disorder on the chemical durability of International Simple Glass." npj Materials Degradation 2.1 (2018): 31.

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