SURFACE-COMPOSITION OF PT25NI75(111) INVESTIGATED BY ISS AND STM

被引：6

作者：

WEIGAND, P ^{[1
]}

NAGL, C ^{[1
]}

SCHMID, M ^{[1
]}

VARGA, P ^{[1
]}

机构：

[1] VIENNA TECH UNIV,INST ALLGEMEINE PHYS,WIEDNER HAUPTSTR 8-10,A-1040 VIENNA,AUSTRIA

来源：

FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY | 1993年 / 346卷 / 1-3期

关键词：

D O I：

10.1007/BF00321431

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Ion scattering spectroscopy results show Pt enrichment in the topmost atomic layers of a Pt25Ni75(111) single crystal due to preferential sputtering. The increased lattice constant caused thereby leads to subsurface lattice mismatch dislocations, which have been studied by scanning tunneling microscopy. Agreement is found for the Pt concentration estimated from the density of dislocations and the results obtained by ISS. Thermal annealing induces further segregation of Pt in the topmost atomic layer. The composition of the subsurface layers has been studied and a strong dependence on the annealing temperature has been found. The observed Pt enrichment in the first monolayer for the thermodynamic equilibrium state agrees well with a thermodynamic theory.

引用

页码：281 / 283

页数：3

共 17 条

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