SURFACE-ANALYSIS OF PTXNI1-X SINGLE-CRYSTALS

被引：47

作者：

WEIGAND, P

NOVACEK, P

VANHUSEN, G

NEIDHART, T

VARGA, P

机构：

[1] Institut für Allgemeine Physik, TU Wien, A-1040 Vienna

来源：

SURFACE SCIENCE | 1992年 / 269卷 / 1 -3 pt B期

关键词：

D O I：

10.1016/0039-6028(92)91404-Y

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 of Pt10Ni90(100), Pt25Ni75(111) and Pt50Ni50(110) single crystal alloys has been determined by ion scattering spectroscopy (ISS) and ultraviolet photoelectron spectroscopy (UPS). Pt enrichment of the topmost layer due to preferential sputtering occurs independently of the surface orientation. Annealing the sputtered alloys results in face specific surface compositions: Pt enrichment for the (111) surface, Ni enrichment for the (110) surface and a composition close to the bulk value for the (100) surface. Exposure of the sputtered surfaces to oxygen induces segregation of Ni. Adsorbate induced segregation is correlated with segregation due to annealing. The determination of workfunctions by UPS results support the ISS results on surface composition. The experimental results on surface segregation are discussed with respect to thermodynamic calculations.

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页码：1129 / 1134

页数：6

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