Abstract
We study the pressure and temperature dependences of the dielectricrelaxation of two molecular glass-forming liquids, dibutyl phthalate andm-toluidine. We focus on two characteristics of the slowing down of relaxation, the fragilityassociated with the temperature dependence and the stretching characterizing therelaxation function. We combine our data with data from the literature to revisit theproposed correlation between these two quantities. We do this in light of constraintsthat we suggest to put on the search for empirical correlations among propertiesof glass-formers. In particular, we argue that a meaningful correlation is to belooked for between stretching and isochoric fragility, as both seem to be constantunder isochronic conditions and thereby reflect the intrinsic effect of temperature.
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