Phase Equilibria in the System BaTiO ₃ —CaTiO ₃

Abstract

The system BaTiO 3 –CaTiO 3 was investigated from room temperature to 1900°C. by several different techniques. The system is characterized by extensive solid solution with a minimum at 18 wt.% CaTiO 3 . The extent of solid solution decreases rapidly with temperature from a maximum of approximately 30 wt.% in each end member at 1595°C. The temperature of the cubic‐hexagonal inversion in BaTiO 3 is raised very rapidly with additions of CaTiO 3 . The tetragonal‐cubic inversion in BaTiO 3 is lowered slightly to a minimum of 105°C. by the additions of CaTiO 3 . Within a wide composition region crystals of cubic BaTiO 3 solid solution may be grown directly from the melt, and at the minimum from a melt of the same composition.