反跳粒子検出法, 陽電子消滅測定法による黒鉛中の水素, 重水素と欠陥の研究 Study of Behavior of Deuterium Atoms and Defects in Graphite by ERD and Positron Annihilation Method

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Behavior of deuterium atoms implanted in graphite has been investigated by ERD (elastic recoil detection) method and the defect behavior has also been studied by positron annihilation method. It was found that diffusion of deuterium atoms shows a significant anisotropy, i.e., very high diffusivity along the direction parallel to the basal plane and very low diffusivity along the direction perpendicular to the basal plane. Deuterium atoms are considered to be trapped at the boundaries between adjacent crystallites and the sites of radiation induced defects and are released from the specimen through three stages in the isochronal annealing process depending on the depth of the trapping potential. The isochronal annealing curve of the positron lifetime for HOPG irradiated with electrons at 77 K can be divided into two stages, i.e., below 1200°C and above 1200°C. In the former the increase of positron lifetime corresponding to the growth of interstitital type loops is observed and in the latter that corresponding to the growth of vacancy type loops (and also to interstitial type loops) is observed. Positron lifetime calculation for a vacancy and vacancy clusters was made and the comparison with the experimental results was also made to clarify the fundamental aspects of radiation induced defects in graphite.

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  • 真空  

    真空 42(10), 897-904, 1999-10-20 

    The Vacuum Society of Japan

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各種コード

  • NII論文ID(NAID)
    10004568540
  • NII書誌ID(NCID)
    AN00119871
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05598516
  • NDL 記事登録ID
    4892047
  • NDL 雑誌分類
    ZN15(科学技術--機械工学・工業--流体機械)
  • NDL 請求記号
    Z16-474
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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