By using realistic many-body potentials for simple melts, including Ag, Al, Au, Co, Cu, Mg, Ni, Pb, Pd, Pt, Rh and Si, molecular-dynamics simulation tests were made of the scaling laws of diffusion coefficients with different expressions of the reduction parameters. These simulation results gave firm support to the universal excess entropy scaling laws, proposed by Rosenfeld and Dzugutov, for transport coefficients in liquid metals. In particular, it was found that the excess entropy, Sex, scaled universally with temperature as: Sex=–ES/T. When the diffusion coefficient was scaled according to Dzugutov, ES was essentially identical to the Arrhenius activation energy; thus indicating that the entropic component in the Arrhenius activation energy was alone responsible for controlling the diffusion rate. Thus, there existed a link between the scaling law and the Arrhenius law. That is, the excess entropy scaling law for the diffusion coefficient could be interpreted as being a straightforward extension of the Arrhenius law.

Scaling Law for Diffusion Coefficients in Simple Melts. G.X.Li, C.S.Liu, Z.G.Zhu: Physical Review B, 2005, 71[9], 094209 (7pp)