Excess-entropy scaling in supercooled binary mixtures

Ian Bell, Jeppe Dyre, Trond Ingebrigtsen*

*Corresponding author

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

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 singlecomponent quasiuniversality.
OriginalsprogEngelsk
Artikelnummer4300
TidsskriftNature Communications
Vol/bind2020
Udgave nummer11
ISSN2041-1723
DOI
StatusUdgivet - 27 aug. 2020

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