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Anisotropy analysis of the surface stress in Ag stepped surfaces with the modified embedded atom method
Author(s) -
Shu Yu,
Zhang JianMin,
Xu KeWei
Publication year - 2007
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.2526
Subject(s) - terrace (agriculture) , surface stress , anisotropy , chemistry , surface energy , atom (system on chip) , surface (topology) , enhanced data rates for gsm evolution , plane (geometry) , condensed matter physics , stress (linguistics) , crystallography , geometry , materials science , physics , optics , mathematics , telecommunications , linguistics , philosophy , archaeology , computer science , history , embedded system
The surface stresses in Ag stepped surfaces (910), (710), (510), (410), (310), (210), (320), (430) and (540) have been calculated by using the modified embedded atom method (MEAM). The surface stresses in the surface plane τ xx (along the step edge) and τ yy (normal to the step edge) have similar orders of magnitude as the surface energy. For surfaces having the (100) and (110) terraces, the change of τ xx and τ yy is very small and the variation of the surface energy is smooth. The stress τ zz (normal to the surface plane) is always tensile in the unrelaxed state. The linear variation of the change in surface energy per unit change in elastic strain ${\partial \gamma\over \partial \varepsilon_{xx}}$ , ${\partial \gamma\over \partial \varepsilon_{yy}}$ and ${\partial \gamma\over \partial \varepsilon_{zz}}$ (i.e. τ xx − γ, τ yy − γ and τ zz ) with the angle α between the ( hk 0) and (100) planes has a turning point corresponding to the (210) surface. The anisotropic ratio in the stepped surface having the (110) terrace is larger than that having the (100) terrace, and the wider the (110) terrace or the narrower the (100) terrace, the larger the ratio τ yy /τ xx . Copyright © 2006 John Wiley & Sons, Ltd.