Nano-Crystalline BaTiO_3 Synthesized by Mechanochemistry

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 BaTi03 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.