Behavior of B in passivating gels formed on International Simple Glass in acid and basic pH
- University of Montpellier (France); Alternative Energies and Atomic Energy Commission (CEA), Cadarache (France); OSTI
- University of Montpellier (France); Alternative Energies and Atomic Energy Commission (CEA), Cadarache (France)
International Simple Glass altered for years in silica saturated conditions develops a passivating gel, which retains some mobile elements such as B and Ca in its inner region. It has been suggested that the retention of these elements impacts the dissolution rate of the glass. However, the elements' retention mechanism, speciation, and diffusion properties are still unknown. This study finds that simultaneous presence of B and Ca in the solution can dramatically slow down glass alteration. However, splitting the B and Ca into two different solutions with other glass elements did not give similar protection against glass alteration. These experiments along with other experiments conducted in basic or acid pH, in which isotopically tagged B can diffuse in gels revealed that (i) water diffusion is not dramatically affected by the retention of B and Ca in passivating gels, and (ii) slow diffusion and high retention of B is observed only in gels developed in basic pH during the tracing experiments. Finally, this last mechanism therefore appears as one of the many mechanisms controlling the glass dissolution rate in the residual regime.
- Research Organization:
- The Ohio State Univ., Columbus, OH (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Performance and Design of Nuclear Waste Forms and Containers (WastePD)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0016584
- OSTI ID:
- 2420562
- Alternate ID(s):
- OSTI ID: 1893555
- Journal Information:
- Journal of Non-Crystalline Solids, Journal Name: Journal of Non-Crystalline Solids Vol. 598; ISSN 0022-3093
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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