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Interaction between impurity nitrogen and tungsten: a first-principles investigation |
Liu Yue-Lin(刘悦林)a)†, Jin Shuo(金硕)b), and Zhang Ying(张颖)b) |
a Department of Physics, Yantai University, Yantai 264005, China; b Department of Physics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China |
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Abstract We investigate the stability, diffusion, and impurity concentration of nitrogen in intrinsic tungsten single crystal employing a first-principles method, and find that a single nitrogen atom is energetically favourable for sitting at the octahedral interstitial site. A nitrogen atom prefers to diffuse between the two nearest neighboring octahedral interstitial sites with a diffusion barrier of 0.72 eV. The diffusion coefficient is determined as a function of temperature and expressed as D(N)=1.66×10-7exp (-0.72/kT). The solubility of nitrogen is estimated in intrinsic tungsten in terms of Sieverts' law. The concentration of the nitrogen impurity is found to be 4.82×10-16 Å-3 at a temperature of 600 K and a pressure of 1 Pa. A single nitrogen atom can easily sit in an off-vacancy-centre position close to the octahedral interstitial site. There exists a strong attraction between nitrogen and a vacancy with a large binding energy of 1.40 eV. We believe that these results can provide a good reference for the understanding of the behaviour of nitrogen in intrinsic tungsten.
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Received: 05 May 2011
Revised: 21 July 2011
Accepted manuscript online:
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PACS:
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61.82.Bg
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(Metals and alloys)
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71.15.Mb
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(Density functional theory, local density approximation, gradient and other corrections)
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66.30.J-
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(Diffusion of impurities ?)
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64.75.Bc
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(Solubility)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 50871009 and 51101135) and the National Magnetic Confinement Fusion Program, China (Grant No. 2009GB106003). |
Cite this article:
Liu Yue-Lin(刘悦林), Jin Shuo(金硕), and Zhang Ying(张颖) Interaction between impurity nitrogen and tungsten: a first-principles investigation 2012 Chin. Phys. B 21 016105
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