THE SURFACE-STRUCTURE AND COMPOSITION OF (111) AND (100) ORIENTED SINGLE-CRYSTALS OF THE ORDERED ALLOY PT3SN

被引:45
作者
HANER, AN [1 ]
ROSS, PN [1 ]
BARDI, U [1 ]
机构
[1] UNIV FLORENCE,DEPT CHEM,I-50121 FLORENCE,ITALY
关键词
D O I
10.1016/0039-6028(91)90829-H
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
The surface composition and structure of [111] and [100] oriented single crystals of the ordered alloy Pt3Sn (Ll2 or Cu3Au-type) were determined using a combination of low-energy electron diffraction (LEED) and low-energy ion scattering spectroscopy (LEISS). The clean annealed surfaces displayed p(2 x 2) and c(2 x 2) LEED patterns, respectively, and the Sn/Pt LEISS intensity ratios at normal incidence were consistent with the surface compositions expected for bulk termination surface structures. In the case of the [100] crystal, preferential termination in the mixed (50% Sn) layer was indicated, which appears to be the consequence of the thermodynamic tendency for Sn to be at the surface. A strong variation in Sn/Pt LEISS intensity ratios with incidence angle was observed on both surfaces, indicating an outward displacement of tin atoms from the plane of platinum atoms.
引用
收藏
页码:15 / 20
页数:6
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