  We study the thermodynamic properties of the high-temperature modification of
fullerites on the basis of the Girifalco intermolecular potential. In the
present work, using Lindemann's melting criterion, we estimate a possible
melting curve Tm(P) of C60 fullerite. To take into account the lattice
anharmonicity, which has a strong effect at T > 700 K, we use the correlative
method of unsymmetrized self-consistent field. To check this approach, first we
have applied it to solid Ar. In the range between its triple point Tt = 83.807
K and 260 K we obtained the mean square relative deviation from experimental
data of about 0.7%. The melting curve for C60 fullerite has been calculated
from the melting point at normal pressure estimated at 1500 K up to 15 kbar,
which corresponds to Tm = 4000 K, i.e. to the temperature estimated by Kim and
Tom\'anek [Phys. Rev. Lett. 72, 2418 (1994)] as that of the decomposition of
the C60 molecule itself.
