Measurements of the diffusion coefficient of '"Sn, '"Sb, " Ag, and ' 'Au in liquid Sn have been made using a shear cell assembly which provides accurate data. The experimental diffusion coefficient is given by D, -= CD, , where D; is obtained using Enskog's theory and C is a correction factor accounting for dynamical effects. C is strongly dependent on the density of the fluid and on the relative mass and size of the solute with respect to the solvent. The data show that (i) the density effects in self-diffusion are qualitatively in good agreement with molecular-dynamics calculations (ii) for impurity diffusion, C decreases with the mass of the solute, whatever the density, as predicted by molecular-dynamics (MD) calculations; (iii) size effects on C are in agreement with MD calculations for impurities larger than the solvent; and (iv) Ag and Au solutes exhibit anomalously large values of C which may be due to valence effects.
Using the shear cell technique the diffusion coefficient DAu of 195Au in liquid Au0.81Si0.19 has been measured in the temperature range 663–1773 K. The experimental values are compared with an estimation of D made in the framework of the Enskog approximation. The relative enhancement of DAu below 1100 K is attributed to short-range order effects in the liquid.
Measurements of the diffusion coefficient of ""Sb, '"Sn, " Ag, and ' 'Au in liquid copper are made using a shear-cell device which provides accurate data. The experimental diffusion coefficient is given by D, = CD;, where D, 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.
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