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Title: Universal scaling in the aging of the strong glass former SiO2

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4953911· OSTI ID:1467569

Here, we show that the aging dynamics of a strong glass former displays a strikingly simple scaling behavior, connecting the average dynamics with its fluctuations, namely, the dynamical heterogeneities. We perform molecular dynamics simulations of SiO2 with van Beest-Kramer-van Santen interactions, quenching the system from high to low temperature, and study the evolution of the system as a function of the waiting time tw measured from the instant of the quench. We find that both the aging behavior of the dynamic susceptibility χ4 and the aging behavior of the probability distribution P(fs,r) of the local incoherent intermediate scattering function fs,r can be described by simple scaling forms in terms of the global incoherent intermediate scattering function C. The scaling forms are the same that have been found to describe the aging of several fragile glass formers and that, in the case of P(fs,r), have been also predicted theoretically. A thorough study of the length scales involved highlights the importance of intermediate length scales. We also analyze directly the scaling dependence on particle type and on wavevector q and find that both the average and the fluctuations of the slow aging dynamics are controlled by a unique aging clock, which is not only independent of the wavevector q, but is also the same for O and Si atoms.

Research Organization:
Bucknell Univ., Lewisburg, PA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-06ER46300
OSTI ID:
1467569
Alternate ID(s):
OSTI ID: 1258495
Journal Information:
Journal of Chemical Physics, Vol. 144, Issue 23; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

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  • Golde, Sebastian; Franke, Markus; Schöpe, Hans Joachim
  • 4TH INTERNATIONAL SYMPOSIUM ON SLOW DYNAMICS IN COMPLEX SYSTEMS: Keep Going Tohoku, AIP Conference Proceedings https://doi.org/10.1063/1.4794587
conference January 2013
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Cited By (2)

Fluctuating phases and fluctuating relaxation times in glass forming liquids journal January 2019
Thermodynamic and transport properties of meteor melt constituents from ab initio simulations: MgSiO 3, SiO 2, and MgO journal June 2019

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