On the Dynamical Theory of Diffusion in Crystals. II. Pressure Dependence of the Self-Diffusion Constant

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Abstract
A dynamical theory of diffusion developed previously is extended to the study of the pressure dependence of the self‐diffusion constant. It is shown that in the limit of low pressures there exists a law of corresponding states of the form ln D ∝T m /T where Tm is the melting temperature of the crystal. It is further shown that the temperature and pressure derivatives of the self‐diffusion coefficient are related as ΔH†=(ΔH m /ΔV m )ΔV† with a dagger referring to activated quantities and a subscript m to fusion parameters. Application of the theory is made to Na and Pb. For Pb, the computed heat of activation is 24 300 cal to be compared with the experimental value of 24 210 cal.

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