Preparation of BaTiO_3 nanopowders by solid phase grinding-low temperature calcination method

BaTiO3 nanopowders were synthesized by the combination of solid phase grinding and low temperature(200 to 300℃) calcination method,using barium hydroxide and tetrabutyl titanate as reactants.The products prepared were characterized by XRD,TEM,IR and ICP;and the formation process of the nanopowders was investigated by means of TG-DTA.The results show that the prepared BaTiO3 nanopowders with particle sizes of 15 to 20nm and almost spherical particle shape are cubic phase,and their molar ratio of barium to titanate is about 1.0.The phase transition from cubic to tetragonal phase of barium titanate occurrs when the temperature of heat treatment is 800 to 1000℃,and the hydroxyl ions existing in the lattice of BaTiO3 is removed when the temperature of heat treatment is 668 to 892℃.