Monte-Carlo-type calculations were performed to study the formation of
monomer, dimer and polymer phases in the A(1)C(60) (A = K, Rb, Cs) sy
stem. The complicated sequence of phase transitions between metastable
and stable phases reported for these systems was reproduced. For exam
ple, the formation of an intermediate f.c.c. phase during the decompos
ition of the metastable dimer phase to the stable polymer phase has be
en observed.