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The Composition and Stability of Nicu Surface Alloys Grown by Ni(CO), Decomposition on Cu

Published online by Cambridge University Press:  28 February 2011

Paul F.A. Alkemade ,
H. Fortuin ,
R. Balkenende ,
F. H. P. M. Habraken  and
W. F. Van Der Weg
Paul F.A. Alkemade
Affiliation:
Department of Atomic and Interface Physics, State University of Utrecht, P.O. Box 80,000, 3508 TA Utrecht, The Netherlands
H. Fortuin
Affiliation:
Department of Atomic and Interface Physics, State University of Utrecht, P.O. Box 80,000, 3508 TA Utrecht, The Netherlands
R. Balkenende
Affiliation:
Department of Atomic and Interface Physics, State University of Utrecht, P.O. Box 80,000, 3508 TA Utrecht, The Netherlands
F. H. P. M. Habraken
Affiliation:
Department of Atomic and Interface Physics, State University of Utrecht, P.O. Box 80,000, 3508 TA Utrecht, The Netherlands
W. F. Van Der Weg
Affiliation:
Department of Atomic and Interface Physics, State University of Utrecht, P.O. Box 80,000, 3508 TA Utrecht, The Netherlands
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Abstract

The composition of NiCu surface alloys, prepared by decomposition of nickel carbonyl on a Cu(100) surface, has been studied before as well as after annealing using MeV Rutherford Backscattering Spectroscopy.

NiCu films with a thickness of 2 nm and of 10 nm, respectively, having a sharp interface with the copper substrate, were grown. The nickel fraction is found to be 65% and 93% respectively. The outermost monolayer is slightly enriched in copper. During annealing interdiffusion between the film and the interface occurs and the enrichment of the surface increases. In case of the 10 nm film the observed diffusion rate is much higher than is expected on the basis of diffusion coefficients published in the literature. This is ascribed to the presence of defects and/or grain boundaries in the grown surface alloy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 111: Symposium O – Microstructure and Properties of Catalysts , 1987 , 391
Copyright
Copyright © Materials Research Society 1988

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