Subsolidus Equilibria in the System BaOCeO ₂ ‐TiO ₂

Abstract

Subsolidus phase relations in the system BaO‐CeO 2 ‐TiO 2 were investigated using X‐ray powder diffraction. The existence of the binary compound CeTi 2 O 5 was confirmed, and its limited stability was studied before the ternary system was investigated. Six compatibility triangles were established in the ternary system at 1200°C. No ternary compound was detected. Extensive mutual solid solubility was observed between BaTiO 3 and BaCeO 3 , whereas little or no solid solubility occurred between the other compounds in the system. The effects of small additions of CeO 2 on the tetragonal→Cubic and cubic→hexagonal transition temperatures of BaTiO 3 were investigated.