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Intermolecular Correlations and Mean Square Relative Displacements in C 60 Fullerite
Author(s) -
Zubov V.I.,
Rodrigues C.G.
Publication year - 2000
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200011)222:2<471::aid-pssb471>3.0.co;2-t
Subject(s) - intermolecular force , anharmonicity , spinodal , square lattice , lattice (music) , mean field theory , thermodynamics , intermolecular interaction , materials science , statistical physics , condensed matter physics , phase (matter) , physics , chemistry , molecule , ising model , quantum mechanics , acoustics
We study molecular properties of the high‐temperature modification of fullerites. In the present work we calculate the intermolecular correlations and the mean square relative displacements in C 60 . The Girifalco intermolecular potential is utilized. The calculations have been made in the whole interval from the equilibrium point with orientationally ordered phase up to the spinodal temperature. To take into account the lattice anharmonicity we use the correlative method of unsymmetrized self‐consistent field. Its second order allows one to investigate correlations in fcc lattice between the nearest, second, third and fourth neighbors. The anharmonicity has strong effect on the intermolecular correlations at T > 700 K, causing their drastic rise near the spinodal point. The dependence of the correlation moments on the distance between molecules and on the crystallographic direction is considered. We compare our results with those for solid Ar and discuss the influence of a special feature of the interaction potentials on the intermolecular correlations and the mean square molecular displacements.