MONOTONOUS CONCENTRATION PROFILE AND RECONSTRUCTION AT PT80FE20(111) - LEED STUDY OF A CATALYST

被引：61

作者：

BECCAT, P ^{[1
]}

GAUTHIER, Y ^{[1
]}

BAUDOINGSAVOIS, R ^{[1
]}

BERTOLINI, JC ^{[1
]}

机构：

[1] CNRS,INST RECH CATALYSE,F-69626 VILLEURBANNE,FRANCE

来源：

SURFACE SCIENCE | 1990年 / 238卷 / 1-3期

关键词：

D O I：

10.1016/0039-6028(90)90069-K

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Low energy electron diffraction (LEED) is used to determine the structure, the composition of the surface region and the substrate order of Pt80Fe20(111). The concentration profile is monotonously decreasing in contrast with disordered PtxNi1-x alloys for the concentration oscillates around the bulk value: the top layer, which is buckled (dz1 = 0.09 ± 0.02 A ̊), is almost pure Pt (C1 = 96 ± 4at% Pt); the second and third layers are also enriched with Pt (C2 = 84 ± 7%, C3, = 85 ± 15%). The interlayer very close to the substrate spacing Δd12 = 0.3 ± 1% and Δd23 = -0.6 ± 2%. In addition, we show that the concentration profile the geometry can be solved independently: for surface alloys of this type, the composition profile can be extracted in the subsitution disorder approximation with a large gain in computing time. © 1990.

引用

页码：105 / 118

页数：14

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