Uniform, submicron BaTiO3 crystallites in tetragonal structure were synthesized by a novel low-temperature liquid-solid reaction method mainly via two simple steps: firstly, BaO2 center dot H2O2 submicron particles of about 130-450 mn were precipitated from the reaction of BaCl2 and H2O2 in a slightly alkaline (pH 8) aqueous solution under the ambient condition; secondly, tetragonal phase BaTiO3 submicrocrystals with the size in the range of 180 to 400 nm could be produced by subjecting the as-prepared BaO2 center dot H2O2 and commercial TiO2 submicron particles to thermal treatment in air at 700 degrees C for 10h. The as-obtained products were characterized by X-ray powder diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and inductively coupled plasma-atomic emission spectroscopy, and scanning electron microscopy. (c) 2006 Elsevier B.V. All rights reserved.