Hydrothermal synthesis of perovskite-type solid solution of (1−x)BaTiO3·xLa2/3TiO3

In the present paper, we report a novel hydrothermal synthesis process for the preparation of A-site deficient perovskite-type solid solution in (1−x)BaTiO3·xLa2/3TiO3 (x=0.1–1.0). The synthesized (1−x)BaTiO3·xLa2/3TiO3 have been characterized by powder X-ray diffraction (XRD), ICP elemental analysis, infrared spectroscopy and scanning electron microscopy. The diffractions of samples with x≤0.7 were well indexed as a cubic structure, which is the same as a cubic perovskite-type BaTiO3. In the compositions of x ≥0.8, the crystal structure changes from the cubic to an orthorhombic one. The effect of hydrothermal conditions has also been examined. In this work, it was observed that the optimum ratios of KOH/Ti, La/Ti, and La/Ba were 90, 0.6x and 0.9(1−x), respectively, and the optimum crystallization temperature was 240–260 °C.