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On the effect of Al on alumino-borosilicate glass chemical durability

Journal Article · · npj Materials Degradation
 [1];  [2];  [2];  [2]
  1. University of Montpellier (France); Alternative Energies and Atomic Energy Commission (CEA), Cadarache (France); OSTI
  2. University of Montpellier (France); Alternative Energies and Atomic Energy Commission (CEA), Cadarache (France)
The chemical durability of borosilicate glass used to confine nuclear wastes is known to vary nonlinearly with their composition, making glass dissolution rate predictions difficult. Here, we focus on the effect of Al, an important oxide of these materials. The initial and residual glass dissolution rates were investigated through experiments conducted at 90 °C and pH 9. Our results show that low Al content glasses dissolve initially faster than glasses with higher Al content, but quickly achieve a lower residual rate due to the rapid formation of a more passivating gel. Nevertheless, the high Al content gel will eventually achieve passivation with a slower reorganization. The strengthening effect of Al on the Si-O bond hydrolysis will result in more stable gels, suggesting that slightly higher Al content in the gel will improve nuclear high-level waste glass durability in geological disposal conditions.
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)
Grant/Contract Number:
SC0016584
OSTI ID:
2420564
Journal Information:
npj Materials Degradation, Journal Name: npj Materials Degradation Journal Issue: 1 Vol. 7; ISSN 2397-2106
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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