Tetragonal BaTiO3 powders were prepared hydrothermally at 240degreesC, in only 12 h, using BaCl(2)(.)2H(2)O and TiCl4, which are rather easy to manipulate. Characterization via X-ray diffiractornetry, scanning electron microscopy, Brunauer-Emmett-Teller analysis, and differential scanning calorimetry confirmed that increasing the NaOH excess concentration (from 0.5M to 2.0M )and decreasing the initial TiCl4 concentration (from 0.625M to 0.15M) promotes the formation of tetragonal BaTiO3 powders. After reaction, the powders were proved to be phase-pure BaTiO3, with no impurities, such as C-l- and CO32-.