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Phase Reeationships for Adsoreed Layers on Surfaces

Published online by Cambridge University Press:  15 February 2011

T.-M. Lu  and
M. G. Lagally
T.-M. Lu
Affiliation:
Center for Integrated Electronics, Department of Physics, Rensselaer Polytechnic Institute, Troy, NY 12181
M. G. Lagally
Affiliation:
Department of Metallurgical and Mineral Engineering and Materials Science Center, University of Wisconsin - Madison, Madison, Wisconsin 53706
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Abstract

Ordering phenomena of adsorbed atoms that are commensurate with the substrate structure can be described by a two-dimensional lattice gas. The major features of temperature-coverage phase diagrams for commensurate overlayers are reviewed and illustrated with several experimental examples. For overlayers with net attractive interactions, a two-phase region consisting of ordered overlayer and nearly empty substrate surface forms at low coverage. Substrate extended defects such as steps can create diffusion barriers, thus forming thermodynamic subsystems by eliminating communication between adsorbed atoms on either side of the steps. Steps can also prevent the growth of a reconstructed layer. Experimental examples are presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 19: Symposium E – Alloy Phase Diagrams , 1982 , 313
Copyright
Copyright © Materials Research Society 1983

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