| Due to its excellent ferroelectric, dielectric, and piezoelectric properties, Barium titanate is widely regarded as a versatile electronic ceramic material. As a continuous process, spray pyrolysis offers an important preparation method for achieving the synthesis of fine, homogeneous particles from precursor solution in a single step, it is of great commercial prospect in synthesis of the BaTiO3 particle with high performance.Barium titanate particles were prepared by ultrasonic spray pyrolysis, using titanium tetra-isopropoxide (TTIP) and barium acetate as precursors. Based on the analysis of formation mechanism of barium titanate particles in this system, this paper investigated the effect and mechanism of different parameters on the characteristics of resulting particles systematically by adjusting such parameters as temperature, precursor solution concentration, solution feed rate, and carrier gas flow rate . The results showed that these parameters are closely related to the particle sizes and their distribution, density, sphericity, purity, crystallinity, production rate of as-prepared barium titanate particles.The process characters of spray pyrolysis and the difference in precipitation rates of the precursor salts caused the undesirable particle morphologies under conventional condition. After comparing the effect routes for improving of particle morphology in this system, the effects of properties of precursor solution for the morphology of as-prepared particles were investigated by adding such assisted additives as citric acid, urea, hydroperoxide. As the results demonstrated, all of the additives employed in this work have positive impact on the morphology of as-prepared particles in various degrees, furthermore, the differences in effect mechanism of different additives resulted in the diversity of improvement degree and evolution process of morphology. |
