Homogenous SiO2 layer coating on BaTiO3 particle by hydrothermal hydrolysis method

Abstract

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. © 2013 The Ceramic Society of Japan.