Electrostatic lattice energies of some ABX3 polytypes with close-packed AX3 layers

Electrostatic lattice energies (Madelung and polarization energies) for five ideal ABX₃, structure types with close-packed AX₃ layers (X = F, Cl, Br, I, O, S) are calculated. Stability regions for the ideal structure types are indicated as function of the anion radius and the anion polarizability. The effect on the electrostatic lattice energy due to trigonal deformations of the AX₃ layers in the 2L and 3L stacked structures is discussed for the anions F and Cl.