Preparation of Ba_2Ti_9O_20 Materials via React-sintering Process

The preparation of Ba2Ti9O20 materials via react-sintering process was investigated. BaCO3 and TiO2 were used as raw materials, after mechanical milling, the mixed powders were pressed into pellets and sintered directly. The reacting mechanism during sintering process was also investigated.Single phase Ba2Ti9O20 materials with a high density of about 4.49 can be obtained after sintering at 1340℃ for 4h. More investigations show that the sintering temperature can be obviously lowered by using high-energy milling process instead of common mechanical milling process. Single phase Ba2Ti9O20 materials with a high density of about 4.44 can be obtained under 1250℃/4h conditions. Smaller particles and homogeneous distribution of the high-energy milling powders are the main reason for their low sintering temperatures.