Abstract: The nano-crystalline BaTiO₃ was successfully synthesized by grinding the mixture of BaO and anatase
TiO₂ in a high-energy mill in nitrogen atmosphere and its mechanism was also discussed. The results suggested that the first stage of
mechanochemical treatment in initial 15h resulted in the occurrence of decreasing of crystalline size and distorting of crystalline lattice together
with amorphization in the mixture powder. BaTiO₃ phase was formed by solid reaction in the mixture powder mechanochemically for 15h to 30h
at the second stage. In the meantime the crystalline particle grew up. At the last stage of further treatment after 30h the crystalline size of
synthesized BaTiO₃ almost didn’t change, because the growing and decreasing of crystalline particle was in a dynamic equilibrium. The crystalline sizes of
synthesized BaTiO₃ by mechanochemistry were in the range of 10 to 30nm by XRD, SEM and TEM.

Key words: mechanochemistry, nano-crystalline, Barium titanate, synthesize