A perspective on the fragility of glass-forming liquids
arXiv:2207.10365 · doi:10.1016/j.nocx.2022.100100
Abstract
We discuss possible extraneous effects entering in the conventional measures of "fragility" at atmospheric pressure that may obscure a characterization of the genuine super-Arrhenius slowdown of relaxation. We first consider the role of density, which increases with decreasing temperature at constant pressure, and then the potential influence of the high-temperature dynamical behavior and of the associated activation energy scale. These two effects involve both thermodynamic parameters and the strength of the "bare" activation energy reflecting the specific bonding between neighboring molecules. They vary from system to system with, most likely, little connection with any putative collective behavior associated with glass formation. We show how to scale these effects out by refining the definition of fragility and modifying the celebrated Angell plot. We dedicate this note to our great and so inspiring friend, Austen Angell, and associate in this tribute another dear colleague who died too soon, Daniel Kivelson.
arXiv commentArticle in a memorial issue in honor of C. Austen Angell
References in corpus (30)
- Theoretical perspective on the glass transition and amorphous materials
- Theory of Structural Glasses and Supercooled Liquids
- The relationship between fragility, configurational entropy and the potential energy landscape of glass forming liquids
- On the Adam-Gibbs-Wolynes scenario for the viscosity increase in glasses
- Fragilities of Liquids Predicted from the Random First Order Transition Theory of Glasses
- Thermodynamic signature of growing amorphous order in glass-forming liquids
- Thermodynamical Scaling of the Glass Transition Dynamics
- Is the Fragility of a Liquid Embedded in the Properties of its Glass?
- Spatial correlations in the dynamics of glassforming liquids: Experimental determination of their temperature dependence
- Spontaneous and induced dynamic fluctuations in glass-formers I: General results and dependence on ensemble and dynamics
- Rigorous Inequalities between Length and Time Scales in Glassy Systems
- Scaling out the density dependence of the relaxation in glassforming polymers
- Fifth-order susceptibility unveils growth of thermodynamic amorphous order in glass-formers
- Spontaneous and induced dynamic correlations in glass-formers II: Model calculations and comparison to numerical simulations
- Scaling the alpha-relaxation time of supercooled fragile organic liquids
- Nonperturbative effect of attractive forces in viscous liquids
- Configurational entropy measurements in extremely supercooled liquids that break the glass ceiling
- Disentangling density and temperature effects in the viscous slowing down of glassforming liquids
- Fast relaxation in a fragile liquid under pressure
- The role of attractive forces in viscous liquids
- Does a growing static length scale control the glass transition?
- Thermodynamics of condensed matter with strong pressure-energy correlations
- Does the Adam-Gibbs relation hold in simulated supercooled liquids?
- On the correlation between fragility and stretching in glassforming liquids
- Point-to-set lengths, local structure, and glassiness
- Isomorphs, hidden scale invariance, and quasiuniversality
- How to "measure" a structural relaxation time that is too long to be measured?
- The viscous slowing down of supercooled liquids as a temperature-controlled superArrhenius activated process: a description in terms of frustration-limited domains
- Understanding fragility in supercooled Lennard-Jones mixtures. II. Potential energy surface
- On the experimental determination of the repulsive component of the potential from high pressure measurements: what is special about twelve?