title: Glass transition of glycerol in the volume-temperature plane.
abstract: We assess the relative importance of spatial congestion and lowered temperature in the slowing dynamics of supercooled glycerol near the glass transition. We independently vary both volume V and temperature T by applying high pressure and monitor the dynamics by measuring the dielectric susceptibility. Our results demonstrate that both variables are control variables of comparable importance. However, a generalization of the concept of fragility of a glass-former shows that the dynamics are quantitatively more sensitive to fractional changes in V than T. We identify a connection between the fragility and a recently proposed density-temperature scaling which indicates that this conclusion holds for other liquids and polymers.
authors.affiliation: University of Massachusetts, Amherst, MA 01003, USA. win@physics.umass.edu
authors.forename: Kyaw Zin
authors.initials: KZ
authors.lastname: Win
authors.forename: Narayanan
authors.initials: N
authors.lastname: Menon