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We study molecular properties of the high-temperature modification offullerites. In the present work we calculate the intermolecular correlationsand the mean square relative displacements in C60. The Girifalco intermolecularpotential is utilized. The calculations have been made in the whole intervalfrom the equilibrium point with orientationally ordered phase up to thespinodal temperature. To take into account the lattice anharmonicity we use thecorrelative method of unsymmetrized self-consistent field. Its second orderallows one to investigate correlations in FCC lattice between the nearest,second, third and fourth neighbors. The anharmonicity has strong effect on theintermolecular correlations at T>700 K, causing their drastic rise near thespinodal point. The dependence of the correlation moments on the distancebetween molecules and on the crystallographic direction is considered. Wecompare our results with those for solid Ar and discuss the influence of aspecial feature of the interaction potentials on the intermolecularcorrelations and the mean square molecular displacements.

Intermolecular Correlations and Mean Square Relative Displacements in C60 Fullerite