Monte Carlo simulations of coupled diffusion and surface reactions during the aqueous corrosion of borosilicate glasses

Kerisit, Sebastien; Pierce, Eric M.; Ryan, Joseph V.

doi:10.1016/j.jnoncrysol.2014.07.020

Monte Carlo simulations of coupled diffusion and surface reactions during the aqueous corrosion of borosilicate glasses

Journal Article · Fri Sep 19 00:00:00 EDT 2014 · Journal of Non-Crystalline Solids

DOI:https://doi.org/10.1016/j.jnoncrysol.2014.07.020· OSTI ID:1286710

Kerisit, Sebastien ^[1]; Pierce, Eric M. ^[2]; Ryan, Joseph V. ^[3]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Fundamental and Computational Sciences Directorate
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Energy and Environmental Sciences Directorate
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Energy and Environment Directorate

Borosilicate nuclear waste glasses develop complex altered layers as a result of coupled processes such as hydrolysis of network species, condensation of Si species, and diffusion. However, diffusion has often been overlooked in Monte Carlo models of the aqueous corrosion of borosilicate glasses. Therefore, in this paper three different models for dissolved Si diffusion in the altered layer were implemented in a Monte Carlo model and evaluated for glasses in the compositional range (75 - x) mol% SiO₂ (12.5 + x/2) mol% B₂O₃ and (12.5 + x/2) mol% Na₂O, where 0 ≤ x ≤ 20%, and corroded in static conditions at a surface-area-to-volume ratio of 1000 m^-1. The three models considered instantaneous homogenization (M1), linear concentration gradients (M2), and concentration profiles determined by solving Fick's 2nd law using a finite difference method (M3). Model M3 revealed that concentration profiles in the altered layer are not linear and show changes in shape and magnitude as corrosion progresses, unlike those assumed in model M2. Furthermore, model M3 showed that, for borosilicate glasses with a high forward dissolution rate compared to the diffusion rate, the gradual polymerization and densification of the altered layer is significantly delayed compared to models M1 and M2. Finally, models M1 and M2 were found to be appropriate models only for glasses with high release rates such as simple borosilicate glasses with low ZrO₂ content.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Environmental Management (EM); USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)

Grant/Contract Number:: AC05-00OR22725; AC05-76RL01830

OSTI ID:: 1286710

Alternate ID(s):: OSTI ID: 1208740
OSTI ID: 1246629

Journal Information:: Journal of Non-Crystalline Solids, Journal Name: Journal of Non-Crystalline Solids Vol. 408; ISSN 0022-3093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
97 MATHEMATICS AND COMPUTING
Alteration layer
Borosilicate glasses
Diffusion
Kinetics
Monte Carlo

Monte Carlo simulations of coupled diffusion and surface reactions during the aqueous corrosion of borosilicate glasses

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