测量表面应力极性依赖性
Measuring the surface stress polar dependence
摘要：
虽然表面自由能的极性依赖性的测量很容易获得，但晶体表面应力的整个极性依赖性的测量不存在。本文提出了一种新的程序，允许，第一次，实验测定晶体的表面应力极性依赖性。为此目的，（1）电迁移用于控制属于晶体平衡形状的表面取向的动力学刻面，以及（2）对于每个不稳定的表面，刻面的周期以及出现的刻面的晶体学角度通过AFM测量。如此获得的数据导致一组方程的数学解，与物理约束兼容，使访问整个晶体的表面应力极性依赖，从而更好地理解表面应力特性。
英文摘要：
While measurements of the polar dependence of the surface free energy are easily available, measurements of the whole polar dependence of the surface stress of a crystal do not exist. In this paper is presented a new procedure that allows, for the first time, the experimental determination of the surface stress polar dependence of a crystal. For this purpose (1) electromigration is used to control the kinetic faceting of surface orientations that belong to the equilibrium shape of the crystal and (2) for each destabilised surface, the period of faceting as well as the crystallographic angles of the appearing facets are measured by AFM. The so-obtained data lead to a set of equations whose mathematical solution, compatible with physical constraints, gives access to the surface stress polar dependence of the whole crystal and thus to a better understanding of surface stress properties.
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