BaTiO3 Fine Particles Synthesized by Sol-gel Method

The amorphous BaTiO3 fine particles were synthesized by the sol-gel method of aqueous solution. The morphology and the structure of the formed particles have been investigating by TEM, SAED, DSC and XRD. The mean size of the particles formed at the aging temperature of 27°C was 27 nm, however those particles were joined each other and the monodispersed particles were not obtained. The only monodispersed particles of 0.1∼1.3 μm diameter were obtained by the synthesis conditions: pH9.0 or the mole ratio of EDTA/(Ba+Ti) = 10.0 of mother liquids. It is assumed that the formation of the monodispersed particles is carried by the dissolution-recrystallization process in the mother liquids. The phase of the produced fine particles was transformed from amorphous to tetragonal BaTiO3 at 600°C.