Formation, atomic distribution and mixing energy in two-dimensional PdxAg1-x surface alloys on Pd(111)

Engstfeld, A. K. and Hoster, H. E. and Behm, R. J. (2012) Formation, atomic distribution and mixing energy in two-dimensional PdxAg1-x surface alloys on Pd(111). Physical Chemistry Chemical Physics, 14 (30). pp. 10754-10761. ISSN 1463-9076

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Abstract

The formation and atom distribution in two-dimensional PdxAg1-x/Pd(111) monolayer surface alloys were studied by high resolution scanning tunnelling microscopy (STM) with chemical contrast. From short-range order (SRO) parameters, we calculate preferences for like or unlike nearest neighbours to elucidate the mixing behaviour of the two components for various sub monolayer Ag surface contents. In the regime of low Ag surface contents (60% Ag) result in a disperse distribution of the atoms in the surface. Effective pair interactions (EPIs) were derived by comparing the measured distribution with distributions obtained using Monte Carlo (MC) simulations. From the EPIs, we derived a function for the mixing energy, which can describe the change from clustering to a disperse distribution. The effects of the resulting surface atom distributions and of the Ag coverage dependent surface mixing/demixing on catalytic reactions are discussed.

Item Type:
Journal Article
Journal or Publication Title:
Physical Chemistry Chemical Physics
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1600/1606
Subjects:
ID Code:
72930
Deposited By:
Deposited On:
13 Feb 2015 13:39
Refereed?:
Yes
Published?:
Published
Last Modified:
09 Sep 2020 02:31