Abstract: The site occupancies of orientational angle 98° and 38° of C60 mole cules versus temperature is investigated by extremal dynamic model in the temper ature range between order-disorder phase transition and glassy transition.The oc cupancy of orientational angle 38° calculated by the model are precisely coinci dent with reported experimental values at T=85K,90K and 260K,respectively.The mo re precise agreement and second-order differential to temperature of site occupa ncy predict that the glassy transition point is at 84K.The relaxation process of two orientational states from non-equilibrium deduced by the new model is relat ed to the non-exponent factor β in KWW equation,and overall relaxation of C60 crystal is mainly attributed to the relaxation of the lowest energy le vel.Considering two energy levels and their energy difference,the calculated β value 0.9495 is near the experimental value 0.94±0.02.

Keywords: 
• C60 /
• orientational occupancy /
• non-equilibrium relaxation