A unified description of MCI3systems with a polarizable ion simulation model

Computer simulations of a range of ionic systems of stoichiometry MX3 using a polarizable, formal charge ionic interaction model are described. The objective of the present work is to describe the optimization of the interaction potentials in the light of new structural information which has become available from neutron scattering studies of the liquid. As well as substantially improving the agreement with experiment for LaC13, TbC13, YC13 and A1C13, simulation results are presented for the first time for ScC13, which is shown to exhibit a fascinating crosslinked network structure. The optimization of potentials for the crystal structures is also considered. It is shown that the C1− ion must be considered as of smaller size in the crystal than in the liquid in order to successfully reproduce the properties of both phases.