Electric Field Gradients in Point-Ion and Uniform-Background Lattices. II

The electric field gradients in point-charge lattices and the electric field in point-dipole lattices are given by the same lattice sums (dipole sums). Expressions for the electric field gradients in point-charge ionic crystals and metals of arbitrary symmetry are presented. Rapidly converging expressions for the dipole sums appearing in these expressions have been obtained in the preceding paper by the method of planewise summation.