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- W4386876329 abstract "Oxygen self-diffusion is key to understanding stoichiometry and defect structures in oxide nuclear fuels. Experimentally, low activation-barrier oxygen migration was found in ThO$_2$, a candidate nuclear fuel, possibly due to short-circuit diffusion mechanisms. Here, we perform extensive molecular dynamics simulations to show that various types of extended defects can enhance oxygen self-diffusion with a much-reduced activation barrier in ThO$_2$. In this work, we consider extended defects including 1D (dislocation), 2D (grain boundary), and 3D (void) defects. Due to the distinct characteristics of each type of extended defect, the modulation of oxygen diffusion varies. These results provide a quantitative description of oxygen transport, which is significantly enhanced within a close distance (nanometer scale) from the extended defects. Among all these defects, grain boundary, particularly the $Sigma 3$ twin boundary with a low formation energy, exhibits the strongest effect on increasing oxygen transport." @default.
- W4386876329 created "2023-09-20" @default.
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- W4386876329 date "2023-09-18" @default.
- W4386876329 modified "2023-09-27" @default.
- W4386876329 title "Extended defects-enhanced oxygen diffusion in ThO2" @default.
- W4386876329 doi "https://doi.org/10.48550/arxiv.2309.09952" @default.
- W4386876329 hasPublicationYear "2023" @default.
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