Fine-crystalline barium titanate was synthesized from a mixture of barium hydroxide monohydrate and titanium dioxide in water vapor medium at 200 °C and 1.55 MPa and subsequently treated in subcritical vapor and supercritical water at 200−400 °C and 1.55-26.3 MPa. Recrystallization of synthesized powder led to an increase in average crystal size and to tetragonal distortion of BaTiO₃ structure. Formation of highly tetragonal BaTiO₃ was observed after the treatment in supercritical water at 400 °C, 26.3 MPa. Treatment of BaTiO₃ crystals in water vapor and supercritical water made for elimination of structural defects and for changes in the morphology and dispersion composition of the powder. The results are of importance for effective production of barium titanate powder of different dispersion as raw material for ferroelectric ceramics.

在水蒸气介质中于200°C和1.55 MPa下，由一水合氢氧化钡和二氧化钛的混合物合成细晶钛酸钡，然后在200-400°C和1.55-26.3 MPa下于亚临界蒸气和超临界水中处理。合成粉末的再结晶导致平均晶体尺寸的增加和BaTiO ₃结构的四方形畸变。在400°C，26.3 MPa的超临界水中处理后，观察到形成了高度四方的BaTiO ₃。BaTiO _3的处理在水蒸气和超临界水中制成晶体，以消除结构缺陷以及改变粉末的形态和分散成分。这些结果对于有效生产不同分散度的钛酸钡粉末作为铁电陶瓷的原料具有重要意义。