Abstract

In a series of diffusion studies, some new diffusion theories different from the existing ones have been reported. One of their theories revealed that the concept of intrinsic diffusion, which is conceived to understand the well-known Kirkendall effect relevant to the interdiffusion, is an illusion. Based on the theory, a new interdiffusion theory is established as a Brown motion in many elements system, regardless of the diffusion field (solvent) in a crystal material or an amorphous one. At the same time, the vacancy diffusion equation of interdiffusion problems in crystal is also presented. The present analytical system is useful for analyzing actual interdiffusion problems in the many elements system. By means of investigating vacancy behavior in the diffusion field composed of many elements, a more accurate analysis of interdiffusion problems will be possible.

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