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Surface Alloy Phases of Immiscible Metals: A Semiempirical Study of Au Growth on Ni(110)

Published online by Cambridge University Press:  21 February 2011

Guillermo Bozzolo ,
Rodrigo Ibañez-Meier  and
John Ferrante
Guillermo Bozzolo
Affiliation:
Analex Corporation, 3001 Aerospace Parkway, Brook Park, OH, 44142–1003
Rodrigo Ibañez-Meier
Affiliation:
WSA, Inc., Palo Alto, CA 94301.
John Ferrante
Affiliation:
National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH 44135.
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Abstract

Recent experiments using scanning tunneling microscopy (STM) show evidence for the formation of surface alloys of metals with a broad miscibility gap. Such is the case for Au deposited on Ni(110), where STM images indicate that at low coverage Au atoms squeeze Ni atoms out of the surface layer forming a surface alloy while the Ni atoms form islands on the surface. We present results of a theoretical modelling of this phenomenon using the BFS method for alloys. We find evidence which strongly support the conclusions drawn from experiment. Ni island formation and alternative short range order patterns are discussed, as well as the transition from a surface alloy phase at low coverages to phase separation at higher coverages.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 355: Symposium B1 – Evolution of Thin-Film and Surface Structure and Morphology , 1994 , 531
Copyright
Copyright © Materials Research Society 1995

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References

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