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.