A novel difference between strong liquids and fragile liquids in their dynamics near the glass transition

Michio Tokuyama, Shohei Enda and Junichi Kawamura

Physica A: Statistical Mechanics and its Applications, 2016, vol. 442, issue C, 1-13

Abstract: The systematic method to explore how the dynamics of strong liquids (S) is different from that of fragile liquids (F) near the glass transition is proposed from a unified point of view discussed recently by Tokuyama. The extensive molecular-dynamics simulations are performed on different glass-forming materials. The simulation results for the mean-nth displacement Mn(t) are then analyzed from the unified point of view, where n is an even number. Thus, it is first shown that in each type of liquids there exists a master curve Hn(α) as Mn(t)=RnHn(α)(vtht/R;D/Rvth) onto which any simulation results collapse at the same value of D/Rvth, where R is a characteristic length such as an interatomic distance, D a long-time self-diffusion coefficient, vth a thermal velocity, and α=F and S. The master curves Hn(F) and Hn(S) are then shown not to coincide with each other in the so-called cage region even at the same value of D/Rvth. Thus, it is emphasized that the dynamics of strong liquids is quite different from that of fragile liquids.

Keywords: Diffusion coefficient; Fragile liquids; Glass transition; Master curve; Strong liquids; Universality (search for similar items in EconPapers)
Date: 2016
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:442:y:2016:i:c:p:1-13

DOI: 10.1016/j.physa.2015.08.046

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