Effect of helium irradiation fluence on He<sub><i>n</i></sub>V<sub><i>m</i></sub> cluster evolution in nickel studied by positron annihilation spectroscopy

  • Gong Yihao
    Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China University of Chinese Academy of Sciences, Beijing 100039, China
  • Jin Shuoxue
    Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • Lu Eryang
    Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • Zhu Te
    Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China University of Chinese Academy of Sciences, Beijing 100039, China
  • Song Ligang
    Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China University of Chinese Academy of Sciences, Beijing 100039, China
  • Yuan Daqing
    China Institute of Atomic Energy, Beijing 102413, China
  • Wang Baoyi
    Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China University of Chinese Academy of Sciences, Beijing 100039, China
  • Cao Xingzhong
    Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

説明

<p>Polycrystalline nickel was irradiated using 50 keV He ions at room temperature. The irradiated fluences were 5 × 1013, 5 × 1014, and 5 × 1015 He+ cm−2, respectively. Positron annihilation Doppler broadening spectroscopy (DBS) was used to characterize the irradiation-induced defect evolution. The DBS results show that a large amount of vacancy defects were introduced in the specimens after helium irradiation. In addition, the DBS data could be also interpreted as the formation of helium-vacancy (HenVm) clusters due to combination between vacancies and helium atoms.</p>

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