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- W2081083669 abstract "Abstract Here we present an analysis and a development of the atomic theory of chemical diffusion as proposed by Manning for a binary system a/b . The general expression for the flux of a tracer in a concentration gradient is first established. This expression of the flux is identified with that deduced in the phenomenological theory. Thus a relationship between the partial correlation factors of vacancies with each of the a and b species is obtained. The effect of “vacancy flow” can be described in terms of these correlation factors. Thus the vacancy flow on species A leads to a correlation of the vacancy jumps with species B and vice versa. We shall see that the Nernst-Einstein equation can be extended to the case of chemical diffusion and that the ratio of the intrinsic diffusion coefficients is equal to the ratio of the mean jump frequencies W A and W B . Also, the activation energies of intrinsic diffusion coefficients are related very simply to the activation enthalpies of atomic jumps. In conclusion, we shall see that chemical diffusion in a binary system a/b can be completely described if either the thermodynamic factor and the coefficients of self diffusion, or the thermodynamic factor and the coefficients of intrinsic diffusion are known as functions of the concentration." @default.
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- W2081083669 date "1974-09-01" @default.
- W2081083669 modified "2023-10-11" @default.
- W2081083669 title "Contribution a la theorie atomique de la diffusion chimique" @default.
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- W2081083669 doi "https://doi.org/10.1016/s0022-3697(74)80119-8" @default.
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