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First-principles investigation on diffusion behaviours of H isotopes: From W(110) surface into bulk and in bulk W |
Liu Yue-Lin (刘悦林)a, Lu Wei (芦苇)a, Gao An-Yuan (高安远)a, Gui Li-Jiang (桂漓江)b, Zhang Ying (张颖)b |
a Department of Physics, Yantai University, Yantai 264005, China; b Department of Physics, Beihang University, Beijing 100191, China |
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Abstract The diffusion behaviours of hydrogen (H), deuterium (D), and tritium (T) from W(110) surface into bulk and in bulk W are investigated using a first-principles calculations combined with simplified models. The diffusion energy barrier is shown to be 1.87 eV from W(110) surface to the subsurface, along with a much reduced barrier of 0.06 eV for the reverse diffusion process. After H enters into the bulk, its diffusion energy barrier with quantum correction is 0.19 eV. In terms of the diffusion theory presented by Wert and Zener, the diffusion pre-exponential factor of H is calculated to be 1.57×10-7 m2·s-1, and it is quantitatively in agreement with experimental value of 4.1×10-7 m2·s-1. Subsequently, according to mass dependence (√1/m ) of H isotope effect, the diffusion pre-exponential factors of D and T are estimated to be 1.11×10-7 m2·s-1 and 0.91×10-7 m2·s-1, respectively.
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Received: 15 March 2012
Revised: 10 June 2012
Accepted manuscript online:
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PACS:
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61.80.Az
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(Theory and models of radiation effects)
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67.63.-r
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(Hydrogen and isotopes)
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66.30.-h
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(Diffusion in solids)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51101135). |
Corresponding Authors:
Liu Yue-Lin
E-mail: liuyl@ytu.edu.cn
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Cite this article:
Liu Yue-Lin (刘悦林), Lu Wei (芦苇), Gao An-Yuan (高安远), Gui Li-Jiang (桂漓江), Zhang Ying (张颖) First-principles investigation on diffusion behaviours of H isotopes: From W(110) surface into bulk and in bulk W 2012 Chin. Phys. B 21 126103
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