Volume 48, Number 6, December 1999
|Page(s)||662 - 666|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
The non-exponential relaxation of the crystal around glass transition temperature
National Laboratory of Solid State Microstructures, Institute for Solid State Physics, Center for Advanced Studies in Science and Technology of Microstructures, Department of Physics, Nanjing University - Nanjing 210093, PRC
2 Center of Advanced Studies, Tsinghua University - Beijing 100084, PRC
Accepted: 11 October 1999
A model of the energy barrier of a molecule between two orientational states in the crystal, which depends on the neighboring molecules, is first proposed. Based on this model, the orientational relaxation of molecules around 90 K was simulated with the Monte Carlo method. The simulation results show that the relaxation is slightly non-exponential and can fit the Kohlrausch-Williams-Watts (KWW) function with the non-exponential factor , which is equal to the experimental data that has not been explained before.
PACS: 64.70.Pf – Glass transitions / 61.48.+c – Fullerenes and fullerene-related materials / 02.50.Ng – Distribution theory and Monte Carlo studies
© EDP Sciences, 1999
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