Title of article
Step-edge segregation of bimetallic alloys: A LEIS study of Pt25Rh75(4 1 0)
Author/Authors
B. Moest، نويسنده , , B and Wouda، نويسنده , , P.T and van der Gon، نويسنده , , A.W.Denier and Langelaar، نويسنده , , M.C and Brongersma، نويسنده , , H.H and Nieuwenhuys، نويسنده , , B.E and Boerma، نويسنده , , D.O، نويسنده ,
Issue Information
هفته نامه با شماره پیاپی سال 2001
Pages
13
From page
159
To page
171
Abstract
We demonstrate that low energy ion scattering can be used to study the step-edge composition on vicinal single crystal surfaces. Employing the shadowing and focusing effects inherent to ion scattering, it is possible to perform site-specific composition measurements on single crystal surfaces over a wide temperature range. By combining these measurements with ion trajectory simulations we have extracted quantitative information concerning the step-edge composition. This technique has been applied to the Pt25Rh75(4 1 0) surface in the temperature range between 400°C and 700°C. The experiments reveal a much stronger Pt enrichment of the step edges than at the terrace sites. This difference between the step-edge composition and the terrace site composition is significantly larger than predicted by simple segregation models based on bond breaking.
Keywords
Ion scattering spectroscopy , low energy ion scattering , Ion–solid interactions , Alloys , Platinum , Vicinal single crystal surfaces , Rhodium , surface segregation
Journal title
Surface Science
Serial Year
2001
Journal title
Surface Science
Record number
1689001
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