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论文类型：期刊论文

发表时间：2007-12-01

发表刊物：PHYSICAL REVIEW B

收录刊物：SCIE、Scopus

卷号：76

期号：21

ISSN号：2469-9950

摘要：A nonlinear kinetic discrete model for interstitial diffusion in a nonuniform system is presented, based on Martin's deterministic model and Hillert's sublattice theory, where the diffusion coefficient of interstitial atoms strongly depends on their local concentration. The nonlinear diffusion of interstitial atoms is characterized by the concentration-dependent correlation coefficient gamma and the relaxation time tau, which are determined by the pair interaction energies between interstitial atoms and between interstitial atoms and matrix atoms, respectively. This model exceeds the range of validity of the traditional Fick's law, and allows of an extension of Fick's law to diffusion on the nanoscale.