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Title: Oxidation kinetics for Ni(111) and the structure of the oxide layers

Abstract

The oxidation kinetics for 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 {sup 18}O{sub 2}. Initially, the surface showed a reflection high energy electron diffraction (RHEED) pattern of the Ni(111)-(2x2)-O chemisorption structure at an oxygen exposure of a few langmuir (1 L:10{sup -6} Torr s) and started to form NiO(111) layers above 10 L. The oxide thickness was saturated with six atomic layers at oxygen exposure of 160 L. The saturated NiO(111) surface shows a (1x1) RHEED pattern not p(2x2) and consists of two domains: NiO(111)-[112]//Ni(111)-[112] (primary) and NiO(111)-[110]//Ni(111)-[112](a small fraction). The elemental depth profile corresponds to the octopolar reconstruction terminated with Ni (0.25 ML) [1 ML=1.33x10{sup 15} atoms/cm{sup 2}: areal density of 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 NiO(111) and Ni(111). Tow step oxidation using {sup 18}O{sub 2} and {sup 16}O{sub 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 NiO layer is derived to bemore » 2.36 eV.« less

Authors:
 [1]; ; ;  [2]
  1. National Institute of Advanced Industrial Science and Technology, AIST Kansai, Midorigaoka, Ikeda, Osaka 563-8577 (Japan)
  2. Department of Physics, Ritsumeikan University, Kusatsu, Shiga-ken 525-8577 (Japan)
Publication Date:
OSTI Identifier:
20976653
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 75; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevB.75.033413; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CHEMISORPTION; CRYSTAL DEFECTS; ELECTRON DIFFRACTION; EV RANGE 01-10; IONS; LAYERS; NICKEL; NICKEL OXIDES; OXIDATION; OXYGEN; REACTION KINETICS; REFLECTION; SURFACES; TEMPERATURE RANGE 0273-0400 K; THICKNESS

Citation Formats

Okazawa, T., Nishizawa, T., Nishimura, T., and Kido, Y. Oxidation kinetics for Ni(111) and the structure of the oxide layers. United States: N. p., 2007. Web. doi:10.1103/PHYSREVB.75.033413.
Okazawa, T., Nishizawa, T., Nishimura, T., & Kido, Y. Oxidation kinetics for Ni(111) and the structure of the oxide layers. United States. doi:10.1103/PHYSREVB.75.033413.
Okazawa, T., Nishizawa, T., Nishimura, T., and Kido, Y. Mon . "Oxidation kinetics for Ni(111) and the structure of the oxide layers". United States. doi:10.1103/PHYSREVB.75.033413.
@article{osti_20976653,
title = {Oxidation kinetics for Ni(111) and the structure of the oxide layers},
author = {Okazawa, T. and Nishizawa, T. and Nishimura, T. and Kido, Y.},
abstractNote = {The oxidation kinetics for 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 {sup 18}O{sub 2}. Initially, the surface showed a reflection high energy electron diffraction (RHEED) pattern of the Ni(111)-(2x2)-O chemisorption structure at an oxygen exposure of a few langmuir (1 L:10{sup -6} Torr s) and started to form NiO(111) layers above 10 L. The oxide thickness was saturated with six atomic layers at oxygen exposure of 160 L. The saturated NiO(111) surface shows a (1x1) RHEED pattern not p(2x2) and consists of two domains: NiO(111)-[112]//Ni(111)-[112] (primary) and NiO(111)-[110]//Ni(111)-[112](a small fraction). The elemental depth profile corresponds to the octopolar reconstruction terminated with Ni (0.25 ML) [1 ML=1.33x10{sup 15} atoms/cm{sup 2}: areal density of 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 NiO(111) and Ni(111). Tow step oxidation using {sup 18}O{sub 2} and {sup 16}O{sub 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 NiO layer is derived to be 2.36 eV.},
doi = {10.1103/PHYSREVB.75.033413},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 3,
volume = 75,
place = {United States},
year = {Mon Jan 15 00:00:00 EST 2007},
month = {Mon Jan 15 00:00:00 EST 2007}
}