Abstract
The reaction scheme of O2 with a Ni(110) surface is investigated from 133 to 703 K by low energy electron diffraction (LEED) and kinetic study. The phase diagram of the O/Ni(110) surface is presented by means of the LEED pattern variation as a function of the O2 exposure in isothermal conditions. The adsorption kinetics of O2 was quantitatively measured using a differentially pumped line of sight quadrupole mass spectrometer. When Ni(110) clean surface is exposed to the O2 below 340 K, disordered NiO is formed. For exposure between 340 and 470 K, the surface reconstructs into the sequence of the (2×1) 1/2 and the (3×1) 2/3 ML missing-row structures, and thereafter a (9×5) suboxide structure develops followed by the growth of an epitaxial NiO(001) layer on top of the metal substrate. Between 470 and 570 K, after the formation of the (3×1) missing-row structure, extra O atoms penetrate into the Ni sublayer leaving the (3×1) structure on the surface, and finally a weak complicated LEED pattern is observed with NiO formation. Above 570 K, the excess surface O and extra chemisorbed O atoms dissolve into the bulk leaving the (2×1) structure on the surface.
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