Connection between slow and fast dynamics of molecular liquids around the glass transition
arXiv:0908.2046 · doi:10.1103/PhysRevE.82.021508
Abstract
The mean-square displacement (MSD) was measured by neutron scattering at various temperatures and pressures for a number of molecular glass-forming liquids. The MSD is invariant along the glass-transition line at the pressure studied, thus establishing an ``intrinsic'' Lindemann criterion for any given liquid. A one-to-one connection between the MSD's temperature dependence and the liquid's fragility is found when the MSD is evaluated on a time scale of approximately 4 nanoseconds, but does not hold when the MSD is evaluated at shorter times. The findings are discussed in terms of the elastic model and the role of relaxations, and the correlations between slow and fast dynamics are addressed.
accepted by Phys Rev E (2010)
References in corpus (8)
- "Isomorphs" in liquid state diagrams
- Pressure-energy correlations in liquids. IV. "Isomorphs" in liquid state diagrams
- Spatial correlations in the dynamics of glassforming liquids: Experimental determination of their temperature dependence
- Evidence of growing spatial correlations at the glass transition from nonlinear response experiments
- Fragility and compressibility at the glass transition
- On the relationship between structure and dynamics in a supercooled liquid
- Universal divergenceless scaling between structural relaxation and caged dynamics in glass-forming systems
- Correlations between vibrational entropy and dynamics in super-cooled liquids
Cited by in corpus (6)
- Elastically Cooperative Activated Barrier Hopping Theory of Relaxation in Viscous Fluids. I. General Formulation and Application to Hard Sphere Fluids
- A new view of the Lindemann criterion
- Connection between fragility, mean-squared displacement and shear modulus in two van der Waals bonded glass-forming liquids
- High-pressure cell for simultaneous dielectric and neutron spectroscopy
- Non-Affine Displacements and the Non-Linear Response of a Strained Amorphous Solid
- Collisional Statistics and Dynamics of 2D Hard-Disk Systems: From Fluid to Solid