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Effect of carbon on hydrogen behaviour in tungsten: first-principle calculations

机译:碳对钨中氢行为的影响:第一性原理计算

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摘要

Using the first-principle method, we investigated the effect of tungsten carbide (WC) surface layers on hydrogen retention in W. The results showed that C is not capable of capturing H atoms efficiently because of Coulomb repulsion between negatively charged C and H atoms in tungsten. Meanwhile, the repulsive force enhances the migration barrier for H to travel through WC layers. The high barrier, therefore, prevents the implanted H from escaping the W matrix. With H implanted continually, more and more H atoms are accumulated in the bulk and diffuse far from the WC layer, which contributes to blister formation in W.
机译:使用第一原理方法,我们研究了碳化钨(WC)表面层对W中氢保留的影响。结果表明,由于C中带负电荷的C和H原子之间的库仑排斥,C无法有效捕获H原子。钨。同时,排斥力增加了H穿过WC层的迁移障碍。因此,高势垒可防止注入的H逸出W矩阵。随着H的不断注入,越来越多的H原子堆积在主体中并扩散到远离WC层的位置,这有助于W中形成气泡。

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  • 来源
    《Nuclear fusion》 |2012年第12期|123003.1-123003.6|共6页
  • 作者单位

    Applied Ion Beam Physics Laboratory, Institute of Modern Physics, Fudan University, Shanghai 200433, People's Republic of China;

    Applied Ion Beam Physics Laboratory, Institute of Modern Physics, Fudan University, Shanghai 200433, People's Republic of China;

    Institute, Kyoto University, Osaka 590-0494, Japan;

    Institute, Kyoto University, Osaka 590-0494, Japan;

    Applied Ion Beam Physics Laboratory, Institute of Modern Physics, Fudan University, Shanghai 200433, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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