Orientational Ordering Transition in Solid C60: DSC, HPLC, and X-ray Studies

The investigation of the orientational ordering transition in solid C{sub 60} was carried out using differential scanning-calorimetry, X-ray, and high-performance liquid chromatography methods. A remarkable influence of crystal dimensions on the temperature and heat of the phase transition was observed. The influence of impurities is found to be less significant, while the slight increase of the lattice parameter after mechanical grinding of solid C{sub 60} is detected. 9 refs., 4 figs., 2 tabs.