Step-edge segregation of bimetallic alloys - A LEIS study of Pt25Rh75(410)

B. Moest; P.T. Wouda; A.W. Denier van der Gon; M.C. Langelaar; H.H. Brongersma; B.E. Nieuwenhuys; D.O. Boerma

doi:10.1016/S0039-6028(00)00964-X

Step-edge segregation of bimetallic alloys - A LEIS study of Pt25Rh75(410)

B. Moest, P.T. Wouda, A.W. Denier van der Gon, M.C. Langelaar, H.H. Brongersma, B.E. Nieuwenhuys, D.O. Boerma

Research output: Contribution to journal › Article › Academic › peer-review

21 Citations (Scopus)

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.

Original language	English
Pages (from-to)	159-171
Journal	Surface Science
Volume	473
Issue number	3
DOIs	https://doi.org/10.1016/S0039-6028(00)00964-X
Publication status	Published - 2001

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title = "Step-edge segregation of bimetallic alloys - A LEIS study of Pt25Rh75(410)",

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.",

author = "B. Moest and P.T. Wouda and {Denier van der Gon}, A.W. and M.C. Langelaar and H.H. Brongersma and B.E. Nieuwenhuys and D.O. Boerma",

year = "2001",

doi = "10.1016/S0039-6028(00)00964-X",

language = "English",

volume = "473",

pages = "159--171",

journal = "Surface Science",

issn = "0039-6028",

publisher = "Elsevier",

number = "3",

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TY - JOUR

T1 - Step-edge segregation of bimetallic alloys - A LEIS study of Pt25Rh75(410)

AU - Moest, B.

AU - Wouda, P.T.

AU - Denier van der Gon, A.W.

AU - Langelaar, M.C.

AU - Brongersma, H.H.

AU - Nieuwenhuys, B.E.

AU - Boerma, D.O.

PY - 2001

Y1 - 2001

N2 - 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.

AB - 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.

U2 - 10.1016/S0039-6028(00)00964-X

DO - 10.1016/S0039-6028(00)00964-X

M3 - Article

SN - 0039-6028

VL - 473

SP - 159

EP - 171

JO - Surface Science

JF - Surface Science

IS - 3

ER -

Step-edge segregation of bimetallic alloys - A LEIS study of Pt25Rh75(410)

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