Dielectric Properties of Solid Solutions of Alkaline Earth Metal Titanates of Perovskite Structure

Areview of the dielectric properties of ceramic materials based on solid solutions of alkaline earth metal titanates of perovskite structure is presented. Solubility ranges of components of two- and three-phase solid solutions are determined. The influence of the component concentration ratios, production methods, and technological parameters on the dielectric properties of ceramics is shown. On the basis of literature data, a three-component phase diagram for BaTiO₃, CaTiO₃, and SrTiO₃ has been compiled for the first time, which shows the relative permittivity values characteristic of various regions in the phase diagram. Ceramics with a content of Ba²⁺ > 40 mol.%, Sr²⁺ < 60 mol.%,, and Ca²⁺ < 40 mol.%, were found to exhibit the highest values of relative permittivity (> 700). An increase in the proportion of Sr²⁺ and Ca²⁺ leads to its significant decrease.