What can we learn by squeezing a liquid
Abstract
Relaxation times for different temperatures, T, and specific volumes, V, collapse to a master curve versus TVg, with g a material constant. The isochoric fragility, mV, 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.
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