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

Journal Article · · Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
 [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)

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1266011
Journal Information:
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics, Vol. 92, Issue 6; ISSN 1539-3755
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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Cited By (4)

A structural interpretation of the two components governing the kinetic fragility from the example of interpenetrated polymer networks: A Structural Interpretation of the Two Components Governing the Kinetic Fragility from the Example of Interpenetrated Polymer Networks journal September 2018
Perspective: Searching for simplicity rather than universality in glass-forming liquids journal December 2018
Superionic UO 2 : A model anharmonic crystalline material journal May 2019
Dynamic and thermodynamic crossover scenarios in the Kob-Andersen mixture: Insights from multi-CPU and multi-GPU simulations journal May 2018

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