期刊
PHYSICAL REVIEW LETTERS
卷 85, 期 1, 页码 110-113出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.110
关键词
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What are the mechanisms leading to the shape relaxation of three-dimensional crystallites? Kinetic Monte Carlo simulations of fee 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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