EFFECT OF PRESSURE ON THE STRUCTURE AND LATTICE-DYNAMICS OF FULLERENECRYSTAL C-60

The low-temperature orientationally ordered crystalline phase of fulle rene C-60 was investigated in dependence on the external pressure. An assumption was made that the energy of the lattice includes two contri butions: a Lennard-Jones (12-6) potential and electrostatic interactio n. The vibrational spectrum of C-60 crystal was calculated using the a tom-atom potential method. The frequencies of intermolecular modes as functions of external pressure were studied. The sound velocities, ela stic constants and bulk modulus are calculated. The dependence of soun d velocities in fullerene crystal C-60 on the external pressure is inv estigated. The results obtained are in good agreement with the availab le experimental data.