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- W2016249904 abstract "The oxidation kinetics for $mathrm{Ni}(111)$ surface and the structure of the oxide layers grown at room temperature were analyzed by high-resolution medium energy ion scattering using isotopically labeled $^{18}mathrm{O}_{2}$. Initially, the surface showed a reflection high energy electron diffraction (RHEED) pattern of the $mathrm{Ni}(111)text{ensuremath{-}}(2ifmmodetimeselsetexttimesfi{}2)text{ensuremath{-}}mathrm{O}$ chemisorption structure at an oxygen exposure of a few langmuir $(1phantom{rule{0.3em}{0ex}}mathrm{L}:{10}^{ensuremath{-}6}phantom{rule{0.3em}{0ex}}mathrm{Torr}phantom{rule{0.2em}{0ex}}mathrm{s})$ and started to form $mathrm{NiO}(111)$ layers above $10phantom{rule{0.3em}{0ex}}mathrm{L}$. The oxide thickness was saturated with six atomic layers at oxygen exposure of $160phantom{rule{0.3em}{0ex}}mathrm{L}$. The saturated $mathrm{NiO}(111)$ surface shows a $(1ifmmodetimeselsetexttimesfi{}1)$ RHEED pattern not $p(2ifmmodetimeselsetexttimesfi{}2)$ and consists of two domains: $mathrm{NiO}(111)text{ensuremath{-}}[11overline{2}]∕∕mathrm{Ni}(111)text{ensuremath{-}}[11overline{2}]$ (primary) and $mathrm{NiO}(111)text{ensuremath{-}}[1overline{1}0]∕∕mathrm{Ni}(111)text{ensuremath{-}}[11overline{2}]$(a small fraction). The elemental depth profile corresponds to the octopolar reconstruction terminated with Ni $(0.25phantom{rule{0.3em}{0ex}}mathrm{ML})$ [$1phantom{rule{0.3em}{0ex}}mathrm{ML}=1.33ifmmodetimeselsetexttimesfi{}{10}^{15}phantom{rule{0.3em}{0ex}}mathrm{atoms}∕{mathrm{cm}}^{2}$: areal density of $mathrm{NiO}(111)$]. The oxide surface grown epitaxially probably takes a precursor state of the octopolar structure with significant distortion because of a large lattice mismatch of 19% between $mathrm{NiO}(111)$ and $mathrm{Ni}(111)$. Tow step oxidation using $^{18}mathrm{O}_{2}$ and $^{16}mathrm{O}_{2}$ clearly indicates that oxidation takes place at the top surface obeying the Cabrera-Mott mechanism. The potential barrier for the jump from Ni into the $mathrm{NiO}$ layer is derived to be $2.36phantom{rule{0.3em}{0ex}}mathrm{eV}$." @default.
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- W2016249904 title "Oxidation kinetics for<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>Ni</mml:mi><mml:mo>(</mml:mo><mml:mn>111</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math>and the structure of the oxide layers" @default.
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- W2016249904 doi "https://doi.org/10.1103/physrevb.75.033413" @default.
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