Patent attributes
The present invention relates to a hydrothermal synthesis for preparing barium titanate powder as the essential material for a multi-layer ceramic capacitor. The object of the invention is to prepare barium titanate powder having high purity, particle size of submicron order, uniform particle distribution and excellent crystallinity, by reacting hydrous titanic acid compound prepared via sulfuric acid process with crystalline titanium oxide and barium hydroxide, as the starting material, at a temperature between 60° C. and 300° C. under a pressure between 5 Kgf/cm2 and 50 Kgf/cm2. The process for preparing barium titanate according to the present invention provides barium titanate powder having Ba/Ti molar ratio of 1.000±0.002 and high purity by applying calcination under reductive condition to the solid product obtained from hydrous titanic acid compound prepared via sulfuric acid process with crystalline titanium oxide and barium hydroxide, as the starting substances, to convert barium sulfate, which was produced from residual sulfide in the raw material, to barium titanate.
