Chemistry

Effect of structural disorder induced by external irradiation with heavy ions on the alteration of a four oxide borosilicate glass

S. Gin, M. Taron, et al.

This groundbreaking study by Stéphane Gin, Mélanie Taron, Hélène Arena, and Jean-Marc Delaye explores how 7 MeV Au ion irradiation impacts a model nuclear glass. Remarkably, they found that irradiation significantly accelerates the interdiffusion and dissolution rates, while revealing intriguing structural changes through Raman spectroscopy.

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Abstract

This study investigates the effects of irradiation by 7 MeV Au ions on a 4-oxide borosilicate glass (CJ2 glass), a simplified model for nuclear glasses. Irradiation increased the interdiffusion rate by more than an order of magnitude in acidic conditions and the initial dissolution rate by a factor of 2.3 at pH 9. The residual dissolution rate was also increased. Raman spectroscopy revealed structural changes including depolymerization of the silicate network and changes in boron speciation. The findings suggest that irradiation primarily affects the kinetics of glass alteration without changing the fundamental nature of the limiting reactions.

Publisher

npj Materials Degradation

Published On

Jun 17, 2024

Authors

Stéphane Gin, Mélanie Taron, Hélène Arena, Jean-Marc Delaye

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