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• W3096091036 abstract "• Work provides new understanding of the early stages of alloy particle formation in nuclear fuel in the presence of fission gas. • Doped CeO 2 was used as a surrogate for UO 2 along with implantation with fission gas to avoid the challenge of handling radioactive material. • The combined effects of heavy recoil damage and elevated temperature led to multicomponent precipitate formation • Iodine segregated to extended defects. • Re, the surrogate for 99 Tc, was found in precipitates formed at 900 °C Multicomponent alloys resembling the ε-phase particles in nuclear fuel have the potential to immobilize 99 Tc in a stable waste form. Formation of such multicomponent alloys under extreme conditions is studied in a non-activated model system: CeO 2 doped with 2 wt.% Mo, 1.5 wt.% Ru, 0.75 wt.% Pd, 0.5 wt.% Re and 0.25 wt.% Rh. The doped CeO 2 films were irradiated with I 2+ ions (610°C, 10 16 and 5×10 16 I 2+ /cm 2 ). For selected samples post-irradiation heat treatment was conducted (900°C, 1100°C). Analytical transmission electron microscopy revealed the formation of 5-20 nm precipitates containing Pd, Mo, and Re sometimes associated with cavities. Iodine was found to segregate to grain boundaries and cracks. After heat treatment at 1100°C, the CeO 2 matrix had recrystallized. Precipitates containing Pd, Mo, Re, and Ru were observed near the interface with the polycrystalline yttria-stabilized zirconia substrate. It follows that Pd is the most mobile element, followed by Mo and Re. While irradiation promotes precipitation, high-temperature effects are more significant." @default.
• W3096091036 created "2020-11-09" @default.
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• W3096091036 date "2021-03-01" @default.
• W3096091036 modified "2023-09-29" @default.
• W3096091036 title "Formation of multicomponent alloy particles in doped ceria under I2+ ion irradiation and thermal annealing" @default.
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• W3096091036 doi "https://doi.org/10.1016/j.jnucmat.2020.152638" @default.
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