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Title: Universal scaling in the aging of the strong glass former SiO 2

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 SiO 2 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 t w measured from the instant of the quench. We find that both the aging behavior of the dynamic susceptibility χ 4 and the aging behavior of the probability distribution P(f s,r) of the local incoherent intermediate scattering function f s,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(f s,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 bymore » a unique aging clock, which is not only independent of the wavevector q, but is also the same for O and Si atoms.« less
Authors:
ORCiD logo [1] ;  [2] ; ORCiD logo [3]
  1. Bucknell Univ., Lewisburg, PA (United States)
  2. Univ. of California, Santa Barbara, CA (United States)
  3. Ohio Univ., Athens, OH (United States)
Publication Date:
Grant/Contract Number:
FG02-06ER46300
Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 144; Journal Issue: 23; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Research Org:
Bucknell Univ., Lewisburg, PA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1467569
Alternate Identifier(s):
OSTI ID: 1258495

Vollmayr-Lee, Katharina, Gorman, Christopher H., and Castillo, Horacio E.. Universal scaling in the aging of the strong glass former SiO2. United States: N. p., Web. doi:10.1063/1.4953911.
Vollmayr-Lee, Katharina, Gorman, Christopher H., & Castillo, Horacio E.. Universal scaling in the aging of the strong glass former SiO2. United States. doi:10.1063/1.4953911.
Vollmayr-Lee, Katharina, Gorman, Christopher H., and Castillo, Horacio E.. 2016. "Universal scaling in the aging of the strong glass former SiO2". United States. doi:10.1063/1.4953911. https://www.osti.gov/servlets/purl/1467569.
@article{osti_1467569,
title = {Universal scaling in the aging of the strong glass former SiO2},
author = {Vollmayr-Lee, Katharina and Gorman, Christopher H. and Castillo, Horacio E.},
abstractNote = {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.},
doi = {10.1063/1.4953911},
journal = {Journal of Chemical Physics},
number = 23,
volume = 144,
place = {United States},
year = {2016},
month = {6}
}