ISSN:
0142-2421
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Physics
Notes:
The interaction of O with the Ni3Al(001) surface has been studied using low-energy He+ scattering. Oxygen adsorption at an exposure of 10 L and a temperature of 700°C results in the total disappearance of the Ni ISS signal, indicating the formation of a monolayer AlOx overlayer. This oxide AlOx overlayer has been examined by measuring the azimuthal angle dependence of the scattered ion yield at fixed scattering angle under different coverages of oxygen. The azimuthal variations of the Ni and Al ISS signals from the O-covered surface are compared with those of Ni and Al from the clean surface, and the results used to derive a value for the fractional coverage of oxygen on the surface. The analysis supports the model that the oxide initially grows in the form of islands, with no influence on remaining areas of the crystal. No evidence of the ordering of the oxide islands was observed. Further evidence of the growth of the AlOx surface. The results indicate that the remaining (uncovered) Ni3Al surface retains the crystal structure of a clean surface. The rate of growth of the AlOx islands on the Ni/3Al(001) surface was also found to be related to temperature.
Additional Material:
10 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/sia.740171303
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