title: Entropic vs. elastic models of fragility of glass-forming liquids: two sides of the same coin?
abstract: The two most influential atomistic models that have been proposed in the literature to explain the temperature dependent activation energy of viscous flow of a glass-forming liquid, i.e., its fragility, are the configurational entropy model of Adam and Gibbs [J. Chem. Phys. 43, 139 (1965)] and the elastic "shoving" model of Dyre et al. [J. Non-Cryst. Solids 352, 4635 (2006)]. Here we demonstrate a qualitative equivalence between these two models starting from the well-established general relationships between the interatomic potentials, elastic constants, structural rearrangement, and entropy in amorphous materials. The unification of these two models provides important predictions that are consistent with experimental observations and shed new light into the problem of glass transition.
authors.affiliation: Division of Materials Science, University of California at Davis, Davis, California 95616, USA.
authors.forename: Sabyasachi
authors.initials: S
authors.lastname: Sen