Another Look at the Pressure Dependence of Interstitial-Substitutional Dissociative Diffusion

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Abstract
The pressure dependence of the interstitial‐substitutional dissociative mechanism of diffusion has been reexamined. It has been predicted previously that for such a mechanism a plot of the logarithm of the diffusion constant D vs the anneal pressure along an isotherm should have negative or zero curvature. A more exact analysis shows that there is no reason why a positive curvature should be prohibited for this mechanism. Before any predictions about the sign of the curvature can be made, it is necessary to look at the factor CsDs/CiDi, where Cs and Ci are the substitutional and interstitial solute concentrations, and Ds and Di are the substitutional and interstitial diffusion constants, respectively.

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