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

Michio Tokuyama, Shohei Enda, Junichi Kawamura

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    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.

    Original languageEnglish
    Pages (from-to)1-13
    Number of pages13
    JournalPhysica A: Statistical Mechanics and its Applications
    Volume442
    DOIs
    Publication statusPublished - 2016 Jan 15

    Keywords

    • Diffusion coefficient
    • Fragile liquids
    • Glass transition
    • Master curve
    • Strong liquids
    • Universality

    ASJC Scopus subject areas

    • Statistics and Probability
    • Condensed Matter Physics

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