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

Abstract

Fundamental thermodynamics and an earlier elastic solid-state point defect model [P. Varotsos and K. Alexopoulos, Phys. Rev B 15, 4111 (1977); 18, 2683 (1978)] are employed to formulate an analytical second-order polynomial function describing the density scaling of the diffusion coefficient in viscous liquids. The function parameters are merely determined by the scaling exponent, which is directly connected with the Gruneisen constant. Density scaling diffusion coefficient isotherms obtained at different pressures collapse on a unique master curve, in agreement with recent computer simulation results of Lennard-Jones viscous liquids, [D. Coslovich and C.M. Roland, J. Phys. Chem. B 112, 1329 (2008)].

Accepted for publication in Phys. Rev. E (2009) Minor typos corrected in the 2nd version

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• Activation Volume in the Density Scaling Regime: Equation of State and Its Test by Using Experimental and Simulation Data
• Correlation of the scaling exponent of the diffusivity-density function in viscous liquids with their elastic properties
• Self-diffusivity as a function of density and temperature in crystalline solids and compensating rules for self-diffusion parameters in Carbon - Subgroup crystals
• A plausible interpretation of the density scaling of the diffusivity in viscous liquids