Changing shapes in the nanoworld

Details Changing shapes in the nanoworld Changing shapes in the nanoworld

2000-05-05

arxiv.org/abs/cond-mat/0005113v1

Physics

Condensed Matter

Materials Science

4 pages, 5 figures. Accepted by Phys Rev Lett

Scientific paper

10.1103/PhysRevLett.85.110

What are the mechanisms leading to the shape relaxation of three dimensional crystallites ? Kinetic Monte Carlo simulations of fcc clusters show that the usual theories of equilibration, via atomic surface diffusion driven by curvature, are verified only at high temperatures. Below the roughening temperature, the relaxation is much slower, kinetics being governed by the nucleation of a critical germ on a facet. We show that the energy barrier for this step linearly increases with the size of the crystallite, leading to an exponential dependence of the relaxation time.

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