Current state of knowledge of nuclear waste glass corrosion mechanisms: the case of R7T7 glass

Critical review of glass performance modeling

“…The thermodynamic stability of the glass as determined with hydration theory is so large that the value of Q in the rate equation never approaches the value of K, so the term (1 -Q/K) remains approximately equal to one. The results from the gel model were similarly unsatisfactory in that dissolution rates higher than observed were predicted [65]. The DISSOL model predicts that very stable clay phases will maintain very low concentrations of dissolved iron and aluminum.…”

Elemental and isotopic (29Si and 18O) tracing of glass alteration mechanisms

“…where q is the glass density (2.75 g cm À3 ) (Vernaz and Dussossoy, 1992). EE i can be used for an estimation of the gel layer thickness if calculated from one of the most leachable elements (e.g.…”

Na, Mg, Ni and Cs distribution and speciation after long-term alteration of a simulated nuclear waste glass: A micro-XAS/XRF/XRD and wet chemical study

“…Mg was investigated as a key major element of the glass alteration products, whereas Na served to distinguish between altered and intact glass. Such distinction was possible because Na is leached out from the glass prior to any other element through selective leaching, a process by which H 3 O + ions diffuse into the glass and exchange for Na + (Vernaz and Dussossoy, 1992;Wicks et al, 1993). Therefore, sodium provided a convenient marker of the spatial extent of the corrosion process and allowed determining the penetration depth of the hydration front into the glass.…”