Abstract: 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.

Key words: react-sintering, Ba₂Ti₉O₂₀, high-energy milling