A bimetallic Ru-Co surface prepared by Ru-3(CO)(12) adsorption on Co(0001)

被引：10
|
作者：
Vaari, J [1 ]
Lahtinen, J [1 ]
Hautojarvi, P [1 ]
机构：
[1] HELSINKI UNIV TECHNOL,PHYS LAB,SF-02150 ESPOO,FINLAND
来源：
SURFACE SCIENCE | 1996年 / 346卷 / 1-3期
关键词：
carbon monoxide; carbonyl; cobalt; computer simulations; growth; low energy ion scattering (LEIS); low index single crystal surfaces; ruthenium; thermal desorption spectroscopy; X-ray photoelectron spectroscopy;
D O I：
10.1016/0039-6028(95)00936-1
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：
We have performed an XPS, TDS, ISS and LEED investigation on the adsorption of ruthenium carbonyl, Ru,(CO),,, on a Co(0001) surface. The adsorption of the carbonyl is molecular at 120 K and its dissociation occurs at 300 K via desorption of CO molecules. The desorption of CO is completed above 500 K, after which XPS and ISS indicate an atomically clean bimetallic surface, and LEED reveals a hexagonal (1 X 1) pattern. The ISS and XPS measurements as a function of Ru coverage indicate the formation of a surface alloy. The lattice constant of the alloy shifts from bulk Co value to bulk Ru value during the Ru deposition. The surface alloy formation is discussed in terms of a Monte Carlo simulation.
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页码：11 / 20
页数：10
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