Synthesis of BaTiO_3 Nano-powder by Microwave Hydrothermal Method

Cubic phase barium titanate nano-powders were synthesized under low temperature by microwave-hydrothermal method. The influence law of factors such as reaction temperature,reaction time,and the dispersant dosage on the specific surface area of particles and regression function were studied by the orthogonal experiment method and linear regression. The crystallized products were characterized by powder X-ray diffraction( XRD),transmission electron microscopy( TEM),X-ray fluorescence( XRF). The experimental results showed that the spherical and well-dispersed cubic phase barium titanate nano-powders which particle size is about 50-100 nm could be prepared under the conditions that the reaction temperature is 70 ℃,and the reaction time is 10 min,and mole ratio of dispersant and titanium is 1∶ 20. Reaction temperature,reaction time,and the dosage of dispersant have different effect on the specific surface area of particles. Among these factors,the significant factors is reaction temperature.