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Methods for producing monodispersed particles of barium titanate

United States Patent

July 24, 2001
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
The present invention is a low-temperature controlled method for producing high-quality, ultrafine monodispersed nanocrystalline microsphere powders of barium titanate and other pure or composite oxide materials having particles ranging from nanosized to micronsized particles. The method of the subject invention comprises a two-stage process. The first stage produces high quality monodispersed hydrous titania microsphere particles prepared by homogeneous precipitation via dielectric tuning in alcohol-water mixed solutions of inorganic salts. Titanium tetrachloride is used as an inorganic salt precursor material. The second stage converts the pure hydrous titania microsphere particles into crystalline barium titanate microsphere powders via low-temperature, hydrothermal reactions.
Hu; Zhong-Cheng (Knoxville, TN)
UT-Battelle, LLC (Oak Ridge, TN)
09/ 393,954
September 10, 1999
This invention was made with Government support under contract DE-AC05-96OR22464 awarded by the Division of Materials Sciences, Office of Basic Energy Sciences, U.S. Department of Energy to Lockheed Martin Energy Research Corporation, the Government has certain rights in this invention.