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6 - Diffusion in special environments

Published online by Cambridge University Press:  06 July 2010

Grazyna Antczak  and
Gert Ehrlich
Grazyna Antczak
Affiliation:
University of Wrocław, Poland; Leibniz Universität Hannover, Germany
Gert Ehrlich
Affiliation:
University of Illinois, Urbana-Champaign
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Summary

Single adatom diffusion on a variety of one- and two-dimensional surfaces has now been surveyed. However, events occurring at plane edges and other types of defects play an important role in affecting diffusion over the entire surface. There are also a huge number of indirect indications that impurities influence atom movement as well as other processes. The amount of direct information available for this field is not large, but we will examine it to gain at least some insight into such phenomena.

Near impurities

Some effort has been made to uncover the way in which atomic diffusion is affected by impurities in the substrate. A start was made by Cowan and Tsong in 1977, who explored the effect of rhenium atoms dissolved in tungsten on the surface diffusion of tungsten atoms on the (110) plane. This surface was prepared from W-3% Re alloy, and so had a number of rhenium substitutional atoms on the (110) plane. Tungsten atoms were then deposited on the surface, and the spatial distribution of places visited by atoms during their thermal movements was measured and compared with that for tungsten moving on the clean W(110), as shown in Fig. 6.1. Tungsten adatoms diffusing over a W-3% Re(110) surface were found to spend more time at a few sites on the surface, which the authors associated as most likely being next to interstitial rhenium atoms embedded in the surface.

Type
Chapter
Information
Surface Diffusion
Metals, Metal Atoms, and Clusters
 , pp. 423 - 516
Publisher: Cambridge University Press
Print publication year: 2010

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