Preparation method of tetragonal phase nano barium titanate

The invention belongs to the technical field of electronic ceramic powder materials, and particularly relates to a preparation method of tetragonal phase nano barium titanate. The invention provides apreparation method of tetragonal phase nano barium titanate, which comprises the following steps: carrying out mechanical activation on titanium dioxide in absolute ethyl alcohol to obtain activatedtitanium dioxide slurry; mixing the activated titanium dioxide slurry with a soluble barium source, and adding a mineralizer into the obtained barium-titanium mixed slurry under a protective gas atmosphere condition to obtain a to-be-reacted mixture; and preheating the to-be-reacted mixture, performing heating, and carrying out hydrothermal reaction to obtain the tetragonal phase nano barium titanate. The test result of the embodiment shows that the tetragonal phase nano barium titanate obtained by the preparation method provided by the invention is regular in microstructure, uniform in particle size, fine in particle,