Preparation of Crystal-Axis-Oriented Barium Calcium Titanate Plate-Like Particles and Its Application to Oriented Ceramic

A novel two-step process has been developed for the preparation of Ba0.9Ca0.1TiO3 plate-like grains with [110]-crystal-axis-orientation. In the first step, plate-like particles of a layered titanate H1.07Ti1.73O4 are solvothermally treated in a Ba(OH)2–Ca(OH)2 mixed solution, and then in the second step, heat-treat the solvothermally treated sample to complete the formation reaction of Ba0.9Ca0.1TiO3. The formation reaction and nanostructure of the Ba0.9Ca0.1TiO3 plate-like grains were characterized using X-ray diffraction, FE-SEM, TEM, and SEAD. The Ba0.9Ca0.1TiO3 plate-like grains are constructed from spherical nanoparticles with particle size of about 10–20 nm. The spherical nanocrystals in each plate-like grain arrange in the same crystal-axis-orientation direction, which presented a diffraction pattern similar to the single crystal. The Ba0.9Ca0.1TiO3 plate-like grains were utilized to fabricate an oriented Ba0.9Ca0.1TiO3 ceramic to demonstrate the potential application of the plate-like grains, and the [110]-oriented Ba0.9Ca0.1TiO3 ceramic with a high degree orientation of F110 = 76% and small grain size of about 1–2 μm was obtained.

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