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- W2515698889 abstract "The diffusion dynamics of hydrogen in bulk and nanocrystalline palladium has been examined using quasielastic neutron scattering (QENS). With respect to bulk ${mathrm{PdH}}_{0.73}$, two relaxation processes were found. For both processes, the variation of the relaxation times with momentum transfer was well reproduced by a model of jump diffusion between adjacent octahedral sites. Upon cooling the fast relaxation fraction decreases. The result suggests that the slow relaxation corresponds to jumps between the ground states and the fast one between excited states. In nanocrystalline ${mathrm{PdH}}_{0.47}$ with a size of 8 nm, we found a fast diffusion process with a smaller activation energy in addition to the one observed in the bulk sample. This process could be due to the motion of hydrogen atoms in the subsurface region where the potential energy surface is substantially modified by surface strain/distortion effects." @default.
- W2515698889 created "2016-09-16" @default.
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- W2515698889 date "2016-08-29" @default.
- W2515698889 modified "2023-10-14" @default.
- W2515698889 title "Hydrogen diffusion in bulk and nanocrystalline palladium: A quasielastic neutron scattering study" @default.
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- W2515698889 doi "https://doi.org/10.1103/physrevb.94.064303" @default.