Physics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..899..281s&link_type=abstract
SIXTH INTERNATIONAL CONFERENCE OF THE BALKAN PHYSICAL UNION. AIP Conference Proceedings, Volume 899, pp. 281-282 (2007).
Physics
Glass Transitions, Time-Dependent Properties, Relaxation
Scientific paper
The rearrangements of molecules in the cooperatively rearranging regions of the glass-forming liquids have been found to be activated hopping and non-activated free-diffusion ones. The total number of configurations in these regions is temperature invariant. At the glass-transition temperature all rearrangements are activated hopping and on rising the temperature they are transformed into the free-diffusion ones. The free diffusion rearrangements are assumed to produce a specific liquid behavior, while the activated-hopping ones a solid-like behavior in the liquid dynamics. The level of the specific liquid dynamics in the fragile liquids at 30-40 K above the glass-transition temperature rises to 50% of the total dynamics, or, the glass-transition represents ``melting'' of the solid-like dynamics. By the identification of the basic molecular units in liquids as thermodynamic ``beads'', it is concluded that molecules do not move like solid spheres as in the Mode Coupling Theory, but through all available intramolecular configurations.
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