Absolute surface energy determination

Details Absolute surface energy determination Absolute surface energy determination

2007-06-15

arxiv.org/abs/0706.2305v1

Surface Science 548 (2004) 13

Physics

Condensed Matter

Materials Science

13 pages, 7 figures

Scientific paper

10.1016/j.susc.2003.11.027

Experimental determination of absolute surface energies remains a challenge. We propose a simple method based on two independent measurements on 3D and 2D equilibrium shapes completed by the analysis of the thermal fluctuation of an isolated step. Using then basic equations (Wulff' theorem, Gibbs-Thomson equation, thermodynamics fluctuation of an isolated step) allows us to extract the absolute surface free energy of a singular face. The so-proposed method can be applied when (i) all orientations exists on the equilibrium shape, (ii) the surface stress is isotropic. This procedure is applied to the case of Si(111) where we find a value between 0.59 Jm-2 and 0.83 Jm-2 at 1373 K.

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