It was recalled that, when a liquid metal structure factor was of hard-sphere form, there was a correlation between structure factor and entropy. This was investigated for liquid alkali, noble and typical polyvalent metals. The pair and triplet correlation entropies (S2, S3) were calculated from the measured diffraction data. The Kirkwood superposition approximation was not used to evaluate the triplet correlation entropy, S3. Assuming that the excess (ion configurational) entropy, SE, was given by S2 + S3 + Sx (where Sx denoted an entropy contribution arising from the 4-body and higher-order correlation terms), the self-diffusion coefficient, D, was calculated on the basis of Dzugutov’s scaling law. From D, the viscosity coefficient, η, and the surface tension, γ, for the liquid metals were estimated by using the Stokes-Einstein relationship, the Born-Green equation and Fowler’s formula for the surface tension. It was found that there was a clear relationship between SE, D, η and γ. The predicted values of D, η and γ were in reasonable agreement with available experimental data.

Excess Entropy, Diffusion Coefficient, Viscosity Coefficient and Surface Tension of Liquid Simple Metals from Diffraction Data. I.Yokoyama, S.Tsuchiya: Materials Transactions, 2002, 43[1], 67-72