Quasiuniversal Excess Entropy Scaling in Binary Supercooled Liquids

Published

August 27, 2020

Author(s)

Ian H. Bell, Jeppe Dyre, Trond Ingebrigtsen

Abstract

Transport coefficients, such as viscosity or diffusion coefficient, show significant dependence on density or temperature near the glass transition. Although several theories have been proposed for explaining this dynamical slowdown, the origin remains to date elusive. We apply here an excess-entropy scaling strategy using molecular dynamics computer simulations and find a quasiuniversal, almost composition-independent, relation for binary mixtures, extending eight orders of magnitude in viscosity or diffusion coefficient. Metallic alloys are also well captured by this relation. The excess-entropy scaling predicts a quasiuniversal breakdown of the Stokes-Einstein relation between viscosity and diffusion coefficient in the supercooled regime. Additionally, we find evidence that quasiuniversality extends beyond binary mixtures, and that the origin is difficult to explain using existing arguments for single-component quasiuniversality

Citation

Nature Communications

Issue

11

Pub Type

Journals

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DOI Link

Keywords

entropy scaling, glass, supercooled, viscosity, diffusion

Citation

Bell, I. , Dyre, J. and Ingebrigtsen, T. (2020), Quasiuniversal Excess Entropy Scaling in Binary Supercooled Liquids, Nature Communications, [online], https://doi.org/10.1038/s41467-020-17948-1 (Accessed May 10, 2024)