A thin silicon dioxide (SiO 2 ) layer coating on the surfaces of 150 and 300-nm BaTiO 3 particles was applied by a hydrothermal hydrolysis method. Sodium silicate (Na 2 SiO 3 ) was used as a raw material, and the concentration, temperature, and pH were controlled. The surface-treated BaTiO 3 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 BaTiO 3 particles. The structure and morphology of the coated layers were analyzed by XRD, FE-SEM, TEM, and EDX.
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