Hydrothermal method, which provides an effective approach to produce pure-phase BiFeO3-based solid solution was used to synthesize BiFeO3-BaTiO3 powders. The phase evolution was found to be connected with reaction temperature, initial KOH concentration, and duration time. The results show that perovskite cubic 0.5BiFeO(3)-0.5BaTiO(3) crystallites can be synthesized at a temperature as low as 200 degrees C, with a KOH concentration of 4M. It indicates that the hydrothermal reactions responsible for the formation of crystalline BiFeO3-BaTiO3 are closely related to metal hydroxides dissolution and crystallization process. Field-emission scanning electron microscopy observations revealed a homogeneous distribution of submicron-sized BiFeO3-BaTiO3 powders. Ferroelectricity was demonstrated for the BiFeO3-BaTiO3 powders by polarization-electric field hysteresis loop measured with the corresponding bulk samples.