A comparative study of the long-term aqueous durability of brannerite (Ce0.94Ti2O6–δ) and glass-brannerite (Fe-Al-BG-Ce0.94Ti2O6–δ) composite materials
Date
2025-01
Authors
Mikhchian, Mehrnaz
Grosvenor, Andrew
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Applied Surface Science
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Article
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Abstract
The long-term aqueous corrosion behavior of Fe-Al borosilicate glass-brannerite (Fe-Al-BG- Ce0.94Ti2O6–δ) composite material as a potential nuclear wasteform has been investigated to understand how the corrosion behavior of these materials can be compared to current nuclear wasteforms (i.e., borosilicate glass). It was found that the aqueous corrosion behavior of the Fe-Al-BG-Ce0.94Ti2O6–δ composite material resulted from a combined corrosion behavior of the individual Fe-Al-BG and Ce0.94Ti2O6–δ phases when these materials were exposed to deionized water. A combination of surface and bulk analyses has demonstrated that the surface composition and chemistry of Ce0.94Ti2O6–δ and Fe-Al-BG-Ce0.94Ti2O6–δ composite materials were affected by aqueous corrosion, whereas the long-range (i.e., bulk) structure of these materials remained stable over 365 days of exposure to deionized water. This study has shown that the corrosion resistance of Fe-Al-BG-Ce0.94Ti2O6–δ composite material is comparable to Fe-Al-BG, which suggests that this composite material could be further investigated as a potential substitute for borosilicate glass nuclear wasteforms.
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Nuclear wasteform, Brannerite, Aqueous corrosion, Surface chemistry, Leaching rate
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DOI
https://doi.org/10.1016/j.apsusc.2024.162233