Microscopic Picture of Aging in SiO2

Katharina Vollmayr-Lee, Robin Bjorkquist, and Landon M. Chambers
Phys. Rev. Lett. 110, 017801 – Published 3 January 2013

Abstract

We investigate the aging dynamics of amorphous SiO2 via molecular dynamics simulations of a quench from a high temperature Ti to a lower temperature Tf. We obtain a microscopic picture of aging dynamics by analyzing single particle trajectories, identifying jump events when a particle escapes the cage formed by its neighbors, and determining how these jumps depend on the waiting time tw, the time elapsed since the temperature quench to Tf. We find that the only tw-dependent microscopic quantity is the number of jumping particles per unit time, which decreases with age. Similar to previous studies for fragile glass formers, we show here for the strong glass former SiO2 that neither the distribution of jump lengths nor the distribution of times spent in the cage are tw dependent. We conclude that the microscopic aging dynamics is surprisingly similar for fragile and strong glass formers.

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  • Received 18 September 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.017801

© 2013 American Physical Society

Authors & Affiliations

Katharina Vollmayr-Lee1,*, Robin Bjorkquist2, and Landon M. Chambers3

  • 1Department of Physics and Astronomy, Bucknell University, Lewisburg, Pennsylvania 17837, USA
  • 2Department of Physics, Cornell University, Ithaca, New York 14853, USA
  • 3Department of Physics, Texas A&M University, College Station, Texas 77843, USA

  • *kvollmay@bucknell.edu

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Vol. 110, Iss. 1 — 4 January 2013

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