  A set of interatomic pair potentials is developed for CdS and ZnS crystals.
We show that a simple energy function, which has been used to describe the
properties of CdSe [J. Chem. Phys. 116, 258 (2002)], can be parametrized to
accurately describe the lattice and elastic constants, and phonon dispersion
relations of bulk CdS and ZnS in the wurtzite and rocksalt crystal structures.
The predicted coexistence pressure of the wurtzite and rocksalt structures, as
well as the equation of state are in good agreement with experimental
observations. These new pair potentials enable the study of a wide range of
processes in bulk and nanocrystalline II-VI semiconductor materials.
