Monosized spherical particles of BaTiO3 have been successfully synthesized by a sonochemical method in a strong alkaline environment using BaCl(2)center dot 2H(2)O as the barium source and TiCl4 as the titanium source. The as-prepared BaTiO3 powders were characterized by employing techniques including X-ray powder diffraction (XRD), scanning electron microscope (SEM), energy dispersive analysis of X-rays (EDAX) and laser particle size analyzer. The effects of reactant concentrations and Ba/Ti molar ratio oil the precipitation of BaTiO3 particles were briefly investigated. The particles have a monosized spherical morphology and the particle size ranges from submicron (600-800 nm) to nanometer (60-70 nm) by increasing the reactant concentration (from 0.072 mol/L to 0.72 mol/L). The studies indicated that increasing the Ba/Ti ratio can promote synthesis of BaTiO3, (c) 2005 Elsevier B.V. All rights reserved.