Surface diffusion of compact and other clusters:: Irx on Ir(111)

被引：117

作者：

Wang, SC ^{[1
]}

Kurpick, U

Ehrlich, G

机构：

[1] Univ Illinois, Mat Res Lab, Urbana, IL 61801 USA

[2] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 81卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.81.4923

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Quantitative measurements have been made of the diffusivity D of larger Ir clusters on Ir(lll) to explore the mechanisms of motion. For noncompact Iris, migration occurs by changes in overall shape as atoms diffuse along cluster edges; in an Arrhenius plot, the prefactor D-0 is similar to 10(-3) cm(2)/s, comparable to that for single atom motion. For Ir-19 and Ir-7, clusters which exist as compact closed shells, diffusion by changes in overall shape is shown to be unlikely. Migration occurs by an entirely different mechanism, with prefactors D-0 being 3 or more orders of magnitude higher than for Ir-18. [S0031-9007(98)07759-X].

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页码：4923 / 4926

页数：4

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