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Fundamental thermodynamics and an earlier elastic solid-state point defectmodel [P. Varotsos and K. Alexopoulos, Phys. Rev B 15, 4111 (1977); 18, 2683(1978)] are employed to formulate an analytical second-order polynomialfunction describing the density scaling of the diffusion coefficient in viscousliquids. The function parameters are merely determined by the scaling exponent,which is directly connected with the Gruneisen constant. Density scalingdiffusion coefficient isotherms obtained at different pressures collapse on aunique master curve, in agreement with recent computer simulation results ofLennard-Jones viscous liquids, [D. Coslovich and C.M. Roland, J. Phys. Chem. B112, 1329 (2008)].

Density scaling of the diffusion coefficient at various pressures in viscous liquids