Structure study of oxygen-adsorbed Ni(111) surface by high energy ion scattering. Technical report

Technical Report · Wed Nov 04 04:00:00 EST 1981

OSTI ID:5508133

Narusawa, T; Gibson, W M; Toernqrist, E

Surface atomic structures of clean, oxygen-adsorbed, and oxidized (111) nickel have been studied quantitatively by using MeV ion scattering in combination with AES and MEED. We show that; the clean (111) nickel surface has the bulk-like structure with reconstruction or relaxation less than 0.02 A, the surface thermal vibration amplitude is enhanced by approx. 20% compared to the bulk value, adsorbed oxygen results in surface lattice expansion by approx. 0.15 A which is closely correlated to the p(2x2) or (sq root 3 times sq root 3)R30 degrees superstructure, and oxidation at room temperature saturates at a stage which incorporates approx 3 monolayers of nickel in a stoichiometric amorphous film of NiO whereas at temperatures higher than approx. 200C thicker oxide films are produced. Our study indicates that each oxygen atom adsorbed on the Ni(111) surface interacts with and relaxes three nearest neighbor nickel atoms, and after saturation of the relaxation, oxidation of three monolayers takes place abruptly after which the oxide layer on the surface apparently blocks further reaction.

• Research Organization: Pennsylvania Univ., Philadelphia (USA)
• OSTI ID: 5508133
• Report Number(s): AD-A-107528/2
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ATOMS
CHARGED PARTICLES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COMPUTERIZED SIMULATION
ELEMENTS
IONS
MOLECULAR STRUCTURE
NICKEL COMPOUNDS
NONMETALS
OXIDATION
OXYGEN
PHYSICAL PROPERTIES
QUANTITATIVE CHEMICAL ANALYSIS
RELAXATION
SCATTERING
SIMULATION
STOICHIOMETRY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS