Measurements of the diffusion coefficient of ${}_{}{}^{124}{}_{}{}^{}\mathrm{Sb}$, ${}_{}{}^{113}{}_{}{}^{}\mathrm{Sn}$, ${}_{}{}^{110m}{}_{}{}^{}\mathrm{Ag}$, and ${}_{}{}^{195}{}_{}{}^{}\mathrm{Au}$ in liquid copper are made using a shear-cell device which provides accurate data. The experimental diffusion coefficient is given by $D_i=C{D}_i^E$, where $D_i^E$ is obtained using Enskog's theory and $C$ is a correction factor accounting for dynamical correlation effects. $C$ is a function of the fluid density and of the relative mass and size of the solute with respect to the solvent. The data show that among the solutes smaller in size and mass than the solvent, those of larger mass and smaller size tend to diffuse more rapidly than predicted by Enskog's theory. For solutes larger and heavier than the solvent, the diffusion coefficient tends to increase with their mass and size.

• Received 15 November 1978

DOI:https://doi.org/10.1103/PhysRevB.19.6123