Abstract: Nanocrystallines of BaTiO₃ with a cubic phase were synthesized by two methods, sol-gel method and sol-precipitation method. Powders
obtained by the sol-gel method was homogeneous and ultrafine (19nm), with a few amounts of BaCO₃. Pure crystallines of BaTiO₃ with larger
grain size of 42nm and some degrees of aggregates were obtained by the sol-precipitation method. The sol-gel powders had higher sintering
density and better dielectric property. Mechanisms for the evolution of crystalline BaTiO₃ in the sol-gel and the sol-precipitation
methods were discussed in the context of microstructure and dielectric properties.

Key words: barium titanate, nano crystalline, sol-gel, sol-precipitation