Abstract
The 13C NMR lineshapes of powdered C 70 have been measured between 450 K and 50 K. A comparison of experimental and simulated lineshapes allowed for a determination of the temperature dependence of the order parameter of the orientational phase transition at T c=270 K and of the tilt angle between the direction of the long axis of the C 70 molecules and the < 111 >; direction in the rhombohedral phase. The results essentially confirm the predictions of molecular dynamics calculations of Sprik, Cheny and Klein.
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