## 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)=^{Rn}Hn(α)(^{vth}t/R;D/R^{vth}) onto which any simulation results collapse at the same value of D/R^{vth}, 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/R^{vth}. Thus, it is emphasized that the dynamics of strong liquids is quite different from that of fragile liquids.

Original language | English |
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Pages (from-to) | 1-13 |

Number of pages | 13 |

Journal | Physica A: Statistical Mechanics and its Applications |

Volume | 442 |

DOIs | |

Publication status | Published - 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