Molecular Dynamics simulations and Neutron Spin Echo experiments of difluorotetrachloroethane glassy crystal

Neutron Spin Echo experiments and Molecular Dynamics simulations (MD) have been performed on difluorotetrachloroethane (CFCl2-CFCl2) glassy crystal. This complementary investigation shows that systems whose dynamics are almost completely controlled by orientational degrees of freedom share some comm...

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Bibliographic Details
Main Authors: Affouard, F, Cochin, E, Decressain, R, Descamps, M, Haeussler, W
Format: Conference Proceeding
Language:English
Online Access:Get full text
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Summary:Neutron Spin Echo experiments and Molecular Dynamics simulations (MD) have been performed on difluorotetrachloroethane (CFCl2-CFCl2) glassy crystal. This complementary investigation shows that systems whose dynamics are almost completely controlled by orientational degrees of freedom share some common dynamical features with glass-forming liquids relatively well described by the idealized version of the Mode Coupling Theory (MCT). It also reveals the existence of two remarkable dynamical crossover temperatures in the pico-nanosecond regime very much in keeping with recent views proposed for supercooled liquids. The highest one, TA 190 K, marks the onset of slow dynamics i.e. non exponential and non-Arrhenian relaxations. The lowest one, Tc 125 K, corresponds to the critical temperature predicted by MCT.
ISSN:0094-243X
DOI:10.1063/1.1764245