The Monte Carlo simulation on the glass transition of C-60 crystal

The relaxation process of C-60, molecule around glass transition temperatur e is studied by Monte Carlo simulation, using a new model of the energy bar rier of molecule between two orientational states in C60 crystal, which dep ends on the state of neighboring molecules. The results show that the relax ation is slightly non-exponential, which can be fit to Kohlrausch-Williams- Watts (KWW) function. The non-exponential factor beta is 0.962 +/- 0.002, a nd this value reproduces the experimental data that has not been explained before. (C) 2000 Elsevier Science Ltd. All rights reserved.