科研之友
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摘要
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 tau(xx) (along the step edge) and tau(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 tau(xx) and tau(yy) is very small and the variation of the surface energy is smooth. The stress tau(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 derivative gamma/partial derivative epsilon(xx), partial derivative gamma/partial derivative epsilon(yy) and partial derivative gamma/partial derivative epsilon(zz) (i.e. tau(xx) - gamma, tau(yy) - gamma and tau(zz)) with the angle alpha between the (hk0) 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 tau(yy)/tau(xx).
