Surface segregation of gold for Au/Pd(111) alloys measured by low-energy electron diffraction and low-energy ion scattering

Li, Zhenjun; Furlong, Octavio; Calaza, Florencia; Burkholder, Luke; Poon, Hin Cheuk; Saldin, Dilano; Tysoe, Wilfred T.

doi:10.1016/j.susc.2008.01.019

Surface segregation of gold for Au/Pd(111) alloys measured by low-energy electron diffraction and low-energy ion scattering

Journal Article · Sat Mar 01 04:00:00 EST 2008 · Surface Science

DOI:https://doi.org/10.1016/j.susc.2008.01.019· OSTI ID:1060429

Li, Zhenjun ^[1]; Furlong, Octavio; Calaza, Florencia; Burkholder, Luke; Poon, Hin Cheuk; Saldin, Dilano; Tysoe, Wilfred T.

University of Wisconsin-Milwaukee

The surface composition of a Au/Pd(111) alloy formed by depositing five monolayers of gold onto clean Pd(111) at 300 K in an ultrahigh vacuum and heating to various temperatures is measured from an analysis of the low-energy electron diffraction (LEED) inten- sity versus energy curves and by low-energy ion scattering (LEIS). The LEIS and LEED data yield values of the outer-layer gold cov- erage that are in good agreement and LEED shows that the second-layer gold concentration is intermediate between that of the surface and bulk. Plotting the gold coverage versus the bulk gold mole fraction estimated using Auger spectroscopy, clearly indicates that gold preferentially segregates to the surface and can be modeled by a simple Langmuir McClean equation. A fit to the experimental data yields a value of the equilibrium constant for segregation of 3.2 ÃÂ± 0.4, in good agreement with the value of 5.4 ÃÂ± 0.2 obtained for Au/Pd(111) alloys grown on Mo(11 0) substrates.

Research Organization:: Univ. of Wisconsin, Milwaukee, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FG02-84ER45076

OSTI ID:: 1060429

Report Number(s):: DOE/FG02/84ER45076; MIL100474

Journal Information:: Surface Science, Journal Name: Surface Science Journal Issue: 5 Vol. 602; ISSN 0039-6028

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Surface segregation Au(Pd(111) alloys LEED Low Energy Ion Scattering

Surface segregation of gold for Au/Pd(111) alloys measured by low-energy electron diffraction and low-energy ion scattering

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