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Ordered mixed surface structures formed by coadsorption of dissimilar metal atoms on Cu(001)

Authors :
Hiroshi Tochihara
Seigi Mizuno
Tetsuroh Shirasawa
Mingshu Chen
Source :
Vacuum. 74:121-131
Publication Year :
2004
Publisher :
Elsevier BV, 2004.

Abstract

We have found that various ordered mixed surface structures are formed by coadsorption of two dissimilar metal atoms on Cu(0 0 1) at room tepmerature, using low-energy electron diffraction (LEED) I – V analysis. As coadsorbates, we employed Mg, Bi, Li and K, and surface structures formed by the coadsorption systems of (Mg, Li), (Mg, K) and (Mg, Bi) are presented. A tensor LEED analysis provided detailed geometries of the coadsorbates and the substrate surface. It was found that the surface structures in the above three coadsorption sytems exhibit the restructuring of the Cu(0 0 1) surface. The phase separation into individual adsorbates does not take place, implying that some additional stabilization arises. We demonstrate two origins for the stabilization of the ordered mixed surface structures on Cu(0 0 1). Structures and features formed by the individual adsorption of Mg, Bi, Li and K atoms on Cu(0 0 1) are described first, then those of (2√2×√2)R45°-Mg,Li, (√5×√5)R26.7°-Mg,K, c(2×2)-Mg,Bi, and c(6×4)-Mg,Bi structures formed by the coadsorption are presented. We consider on the basis of the determined structural parameters the question why ordered mixed surface structures are formed instead of the phase separation.

Details

ISSN :
0042207X
Volume :
74
Database :
OpenAIRE
Journal :
Vacuum
Accession number :
edsair.doi...........020bd6b512dd98c9bc535bdb6642f149
Full Text :
https://doi.org/10.1016/j.vacuum.2003.12.109