Qualitative change in structural dynamics of some glass-forming systems

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
V N Novikov, A P Sokolov

Abstract

Analysis of the temperature dependence of the structural relaxation time τ(α)(T) in supercooled liquids revealed a qualitatively distinct feature-a sharp, cusplike maximum in the second derivative of logτ(α)(T)at some T(max). It suggests that the super-Arrhenius temperature dependence of τ(α)(T) in glass-forming liquids eventually crosses over to an Arrhenius behavior at T<T(max), and there is no divergence of τ(α)(T) at nonzero T. T(max) can be above or below T(g), depending on the sensitivity of τ(T) to a change in the liquid's density quantified by the exponent γ in the scaling τ(α)(T)∼exp(A/Tρ(-γ)). These results might turn the discussion of the glass transition in a different direction-toward the origin of the limiting activation energy for structural relaxation at low T.

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Citations

May 19, 2018·The European Physical Journal. E, Soft Matter·Daniele CoslovichWalter Kob
Dec 17, 2019·Soft Matter·Valeriy V Ginzburg
Oct 23, 2017·The Journal of Chemical Physics·Jun Young ChungChristopher M Stafford
Dec 24, 2018·The Journal of Chemical Physics·Kristine Niss, Tina Hecksher
May 10, 2019·The Journal of Chemical Physics·Hao ZhangJack F Douglas
Dec 25, 2016·The Journal of Chemical Physics·Wen-Sheng XuKarl F Freed

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