Surface structure and segregation profile of the alloyAu3Pd(110):Experiment and theory

The RAS of two monolayers of Pd deposited on the Au(110)1 × 2 surface

“…The result of the annealing is the almost complete return to the spectral profile of the RAS achieved from the clean well-ordered Au(110)1x2 surface. This supports the view deduced from a range of studies on this system, using a variety of techniques [4][5][6], that after such a procedure surface segregation creates either a mixed AuPd alloy or a Pd interface layer both of which are terminated by a nearly pure Au surface layer.…”

“…The STM and LEED results of this work are consistent with the formation of a thin Au surface layer on top of either a Pd or a mixed Pd/Au layer following the anneal. This might be expected to happen since the Au(110) surface of a Au 3 Pd single crystal consists of a pure Au surface showing the 1x2 reconstruction [5]. If this Au(110)1x2 surface forms it would be expected to create the surface states found on the clean surface and these would contribute to the RAS in the spectral region 1.5 eV to 2.2 eV in the same way as on the clean Au(110)1x2 surface thus accounting for the similarity of the two spectra in this region (Fig.…”

Surface structure and composition of the alloyAu3Pd(100)determined by LEED and ion scattering spectroscopy

“…This is also corroborated by theoretical studies using an combined embedded atom method/ Monte Carlo simulation approach to calculate the order parameter. 16 The ͑100͒ oriented surface of gold is known to be reconstructed in a similar way to the Pt͑100͒ and Ir͑100͒ surfaces. 17,18 For these surfaces the topmost layer reconstructs to a near hexagonal arrangement, leading to a c(26 ϫ68)-LEED pattern in the case of Au͑100͒.…”

MONTE CARLO SIMULATION OF THE SURFACE SEGREGATION OF Au75Pd25 AT (110) SURFACE USING AN ANALYTIC EMBEDDED ATOM METHOD

“…Au-Pd alloy is a well in good catalyzer, which can be utilized in pollution control. 22,23 In the experiment, this system was studied by Kuntze et al, 24 using quantitative low energy electron diffraction (LEED) and low energy ion scattering spectroscopy (LEIS). The results show that Au enriched in the two topmost layers of Au 75 Pd 25 and the alloy surface is (1 × 2) missing row reconstructed similar with the Au (110) surface.…”