THEORY OF ADSORPTION AND SURFACTANT EFFECT OF SB ON AG(111)

被引:121
作者
OPPO, S [1 ]
FIORENTINI, V [1 ]
SCHEFFLER, M [1 ]
机构
[1] UNIV CAGLIARI,DIPARTIMENTO SCI FIS,I-09124 CAGLIARI,ITALY
关键词
D O I
10.1103/PhysRevLett.71.2437
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We present first-principles studies of the adsorption of Sb and Ag on clean and Sb-covered Ag(111). For Sb, the substitutional adsorption site is found to be greatly favored with respect to on-surface fcc sites and to subsurface sites, so that a segregating surface alloy layer is formed. Adsorbed silver adatoms are more strongly bound on clean Ag(111) than on Sb-covered Ag. We propose that the experimentally reported surfactant effect of Sb is due to Sb adsorbates reducing the Ag adatom mobility. This gives rise to a high density of Ag islands which coalesce into regular layers.
引用
收藏
页码:2437 / 2440
页数:4
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