Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 487, Issue -, Pages 128-134Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2017.01.038
Keywords
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Funding
- National Natural Science Foundation of China [11505229]
- National Magnetic Confinement Fusion Program [2015GB112001]
- Anhui Provincial Natural Science Foundation [1508085SQE209]
- Youth Innovation Promotion Association of CAS [2015384]
- Center for Computation Science, Hefei Institutes of Physical Sciences
- International Atomic Energy Agency
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We have systematically evaluated binding energies of hydrogen with inert-gas (helium, neon, and argon) defects, including interstitial clusters and vacancy-inert-gas complexes, and their stable configurations using first-principles calculations. Our calculations show that these inert-gas defects have large positive binding energies with hydrogen, 0.4-1.1 eV, 0.7-1.0 eV, and 0.6-0.8 eV for helium, neon, and argon, respectively. This indicates that these inert-gas defects can act as traps for hydrogen in tungsten, and impede or interrupt the diffusion of hydrogen in tungsten, which supports the discussion on the influence of inert-gas on hydrogen retention in recent experimental literature. The interaction between these inert-gas defects and hydrogen can be understood by the attractive interaction due to the distortion of the lattice structure induced by inert-gas defects, the intrinsic repulsive interaction between inert-gas atoms and hydrogen, and the hydrogen-hydrogen repelling in tungsten lattice. (C) 2017 Elsevier B.V. All rights reserved.
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