What can we learn by squeezing a liquid

TL;DR

This paper demonstrates that relaxation times in glass-formers collapse onto a universal master curve when plotted against TV^g, revealing a material constant g that governs dynamics and enables a universal power law without divergence below Tg.

Contribution

It introduces a 3-parameter function fitting relaxation times across various glass-formers, highlighting the universal role of the parameter g in supercooled dynamics.

Findings

Relaxation times collapse onto a master curve versus TV^g.

The isochoric fragility m_V is inversely correlated with g.

A universal power law describes the dynamics across materials.

Abstract

Relaxation times for different temperatures, T, and specific volumes, V, collapse to a master curve versus TV^g, with g a material constant. The isochoric fragility, m_V, is also a material constant, inversely correlated with g. From these we obtain a 3-parameter function, which fits accurately relaxation times of several glass-formers over the supercooled regime, without any divergence below Tg. Although the 3 parameters depend on the material, only g significant varies; thus, by normalizing material-specific quantities related to g, a universal power law for the dynamics is obtained.