The Coulomb potential is estimated for the tetragonal distortion of the PbFCl-type lattice using Ewald's formula over a large lattice ratio c/a range. The expressions describing the lattice self-potentials for distinct ion sites as functions of c/a are derived by taking into account the regular symmetric crystallization. The obtained results will be useful for elucidate the ionic behavior with high-pressure of this type of layered crystals.
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