Abstract
The crystallographic and dielectric properties of complex perovskites are described in terms of average A‐ and B‐site ionic radii, charges, and electronic structures. The relative importance of these to the ferroelectric state is evaluated by a study of a number of solid solutions containing trivalent bismuth. Two new ferroelectrics, Bi0.5K0.5TiO3 and Bi0.5Na0.5TiO3, and the phase diagrams of the systems BixKxBa1–2xTiO3, Bi0.5KxNa0.5—xTiO3, BixKxPb1–2xZrO3, and BixNaxPb1–2xZrO3 are reported.