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• W3105452511 abstract "We used classical and accelerated molecular dynamics simulations to characterize vacancy-mediated diffusion of cations in Gd$_2$Ti$_2$O$_7$ pyrochlore as a function of the disorder on the microsecond timescale. We find that cation vacancy diffusion is slow in materials with low levels of disorder. However, higher levels of disorder allow for fast cation diffusion, which is then also accompanied by fast antisite annihilation and ordering of the cations. The cation diffusivity is therefore not constant, but decreases as the material reorders. The results suggest that fast cation diffusion is triggered by the existence of a percolation network of antisites. This is in marked contrast with oxygen diffusion, which showed a smooth increase of the ionic diffusivity with increasing disorder in the same compound. The increase of the cation diffusivity with disorder is also contrary to observations from other complex oxides and disordered media models, suggesting a fundamentally different relation between disorder and mass transport. These results highlight the dynamic interplay between fast cation diffusion and the recovery of disorder and have important implications for understanding radiation damage evolution, sintering and aging, as well as diffusion in disorder oxides more generally." @default.
• W3105452511 created "2020-11-23" @default.
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• W3105452511 date "2017-09-20" @default.
• W3105452511 modified "2023-09-25" @default.
• W3105452511 title "Evidence for percolation diffusion of cations and reordering in disordered pyrochlore from accelerated molecular dynamics" @default.
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• W3105452511 doi "https://doi.org/10.1038/s41467-017-00708-z" @default.
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