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Oxygen‐induced surface segregation of hydrogen in polycrystalline titanium
Author(s) -
Azoulay A.,
Atzmony U.,
Mintz M. H.,
Shamir N.
Publication year - 1992
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740180902
Subject(s) - titanium , crystallite , hydrogen , oxygen , impurity , elastic recoil detection , sulfur , reactivity (psychology) , materials science , analytical chemistry (journal) , chemistry , chemical physics , inorganic chemistry , metallurgy , medicine , alternative medicine , organic chemistry , pathology , chromatography
Oxygen‐induced surface segregation of hydrogen has been investigated in polycrystalline titanium. It was found that sulphur impurities in titanium preferentially segregate to the surface on heating the sample. Consequently, the properties and reactivity of the sulphur‐containing surfaces were modified relative to sulphur‐free samples in a way which enabled the performance of quantitative kinetic segregation measurements utilizing direct recoil spectrometry (DRS). The time behaviour of hydrogen accumulation on the surface pointed to a segregation mechanism involving subsurface‐to‐surface hopping as the rate‐determining step.