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Title: Qualitative change in structural dynamics of some glass-forming systems

Abstract

Analysis of the temperature dependence of the structural relaxation time Τα(T) in supercooled liquids revealed a qualitatively distinct feature a sharp, cusplike maximum in the second derivative of log Τα(T) at some Tmax. It suggests that the super-Arrhenius temperature dependence of Τα(T) in glass-forming liquids eventually crosses over to an Arrhenius behavior at T < Tmax, and there is no divergence of Τα(T) at nonzero T . Tmax can be above or below Tg, depending on the sensitivity of τ(T) to a change in the liquid's density quantified by the exponent γ in the scaling Τα(T) ~exp(A/Tρ–γ). Lastly, 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.

Authors:
 [1];  [2]
+ Show Author Affiliations
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1266011
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 6; Journal ID: ISSN 1539-3755
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Novikov, Vladimir N., and Sokolov, Alexei P. Qualitative change in structural dynamics of some glass-forming systems. United States: N. p., 2015. Web. doi:10.1103/PhysRevE.92.062304.
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Novikov, Vladimir N., & Sokolov, Alexei P. Qualitative change in structural dynamics of some glass-forming systems. United States. https://doi.org/10.1103/PhysRevE.92.062304
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Novikov, Vladimir N., and Sokolov, Alexei P. Mon . "Qualitative change in structural dynamics of some glass-forming systems". United States. https://doi.org/10.1103/PhysRevE.92.062304. https://www.osti.gov/servlets/purl/1266011.
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@article{osti_1266011,
title = {Qualitative change in structural dynamics of some glass-forming systems},
author = {Novikov, Vladimir N. and Sokolov, Alexei P.},
abstractNote = {Analysis of the temperature dependence of the structural relaxation time Τα(T) in supercooled liquids revealed a qualitatively distinct feature a sharp, cusplike maximum in the second derivative of log Τα(T) at some Tmax. It suggests that the super-Arrhenius temperature dependence of Τα(T) in glass-forming liquids eventually crosses over to an Arrhenius behavior at T < Tmax, and there is no divergence of Τα(T) at nonzero T . Tmax can be above or below Tg, depending on the sensitivity of τ(T) to a change in the liquid's density quantified by the exponent γ in the scaling Τα(T) ~exp(A/Tρ–γ). Lastly, 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.},
doi = {10.1103/PhysRevE.92.062304},
journal = {Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics},
number = 6,
volume = 92,
place = {United States},
year = {Mon Dec 14 00:00:00 EST 2015},
month = {Mon Dec 14 00:00:00 EST 2015}
}
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    Works referencing / citing this record:

    Perspective: Searching for simplicity rather than universality in glass-forming liquids
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    • The Journal of Chemical Physics, Vol. 149, Issue 23
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    Superionic UO 2 : A model anharmonic crystalline material
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    Dynamic and thermodynamic crossover scenarios in the Kob-Andersen mixture: Insights from multi-CPU and multi-GPU simulations
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    • Coslovich, Daniele; Ozawa, Misaki; Kob, Walter
    • The European Physical Journal E, Vol. 41, Issue 5
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