Ti(0001)単結晶表面での水素吸収過程  [in Japanese] Hydrogen Sorption by Ti(0001) Single Crystal Surfaces  [in Japanese]

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Abstract

Hydrogen interaction with the Ti (0001) single crystal surface was investigated with Nuclear Reaction Analysis (NRA) using <SUP>1</SUP>H (<SUP>15</SUP>N, αγ) <SUP>12</SUP>C. In contrast to thin polycrystalline Ti-films, molecular H<SUB>2</SUB> adsorbs only with a small integral sticking coefficient on the single crystal surface even at 120 K and the H coverage saturates at 1.0 ML. Admission of atomic H at this temperature results in further hydrogen uptake, which saturates after absorption of an additional monolayer of H into subsurface sites. The H diffusion remains restricted up to240 K, causing accumulation of absorbed H in a shallow region of only7 nm depth beneath the surface under atomic H exposure conditions. With a maximum of10 at.% the H-concentration in this thin hydride overlayer remains far below the bulk solubility limit of TiH<SUB>2</SUB>. Only above240 K the observed H distributions along the concentration gradient into the bulk are in agreement with extrapolated diffusion data for α-Ti.

Journal

  • Shinku

    Shinku 45(5), 458-462, 2002-05-20

    The Vacuum Society of Japan

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Codes

  • NII Article ID (NAID)
    10008831103
  • NII NACSIS-CAT ID (NCID)
    AN00119871
  • Text Lang
    JPN
  • Article Type
    SHO
  • ISSN
    05598516
  • NDL Article ID
    6193467
  • NDL Source Classification
    ZN15(科学技術--機械工学・工業--流体機械)
  • NDL Call No.
    Z16-474
  • Data Source
    CJP  NDL  J-STAGE 
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