Homogenous SiO₂ layer coating on BaTiO3 particle by hydrothermal hydrolysis method

A thin silicon dioxide (SiO₂) layer coating on the surfaces of 150 and 300-nm BaTiO₃ particles was applied by a hydrothermal hydrolysis method. Sodium silicate (Na₂SiO₃) was used as a raw material, and the concentration, temperature, and pH were controlled. The surface-treated BaTiO₃ particles were dried at 120°C and fired at 650°C for 30 min. The thickness of the coated layer was about 4.52 nm, and the layers were homogenously coated onto the BaTiO₃ particles. The structure and morphology of the coated layers were analyzed by XRD, FE-SEM, TEM, and EDX.