非Fickian电流使杂质通过移动杂质-缺陷对机制向上扩散
Non-Fickian current enabling the uphill diffusion of impurities diffusing by the mechanism of mobile impurity-defect pairs
摘要：
导出了由移动对介导的扩散方程。除了已知的非Fickian（n-F）的行为在小的时空尺度下均匀的缺陷分布的方程预测另一种类型的n-F扩散，可能只发生在非均匀的情况下，可以在任何规模的操作。在缓慢变化的不均匀性的限制，n-F扩散电流已被确定，并示出能够诱导的上坡扩散。有人认为，后者应该在FCC金属中约三分之一的杂质中观察到。
英文摘要：
Equations governing the diffusion mediated by the mobile pairs have been derived. In addition to known non-Fickian (n-F) behavior observable at small spatiotemporal scale under homogeneous defect distribution the equations predict another type of n-F diffusion that may take place only in the inhomogeneous case and can be operative at any scale. In the limit of slowly varying inhomogeneity the n-F diffusion current has been identified and shown to be able to induce the uphill diffusion. It has been argued that the latter should be observable in about one third of impurities in FCC metals.
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