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

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 T max. It suggests that the super-Arrhenius temperature dependence of Τα(T) in glass-forming liquids eventually crosses over to an Arrhenius behavior at T < T max, and there is no divergence of Τα(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 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]
  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:
Grant/Contract Number:
AC05-00OR22725
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)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1266011

Novikov, Vladimir N., and Sokolov, Alexei P.. Qualitative change in structural dynamics of some glass-forming systems. United States: N. p., Web. doi:10.1103/PhysRevE.92.062304.
Novikov, Vladimir N., & Sokolov, Alexei P.. Qualitative change in structural dynamics of some glass-forming systems. United States. doi:10.1103/PhysRevE.92.062304.
Novikov, Vladimir N., and Sokolov, Alexei P.. 2015. "Qualitative change in structural dynamics of some glass-forming systems". United States. doi:10.1103/PhysRevE.92.062304. https://www.osti.gov/servlets/purl/1266011.
@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 = {2015},
month = {12}
}