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物理学报. 2000, 49(10): 2001-2006.
doi: 10.7498/aps.49.2001.
C60分子在有序-无序和玻璃态相变间的取向概率与弛豫行为
- 收稿日期: 2000-02-26
- 修回日期: 2000-04-29
- 刊出日期: 2000-10-20
English Abstract
ORIENTATIONAL POPULATION AND RELAXATION BEHAVIOR OF C60 MOLECULES BET WEEN ORDER-DISORDER PHASE TRANSITION AND GLASSY TRANSITION
- Received Date:
26 February 2000
- Accepted Date:
29 April 2000
- Published Online:
20 October 2000
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.
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Keywords:
- C60 /
- orientational occupancy /
- non-equilibrium relaxation
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