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Preparation of Spherical, Solid Barium Titanate Particles with Uniform Composition at High Precursor Concentration by Spray Pyrolysis
Author(s) -
Gao Lian,
Xu Huarui
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.00830.x
Subject(s) - oxalate , hydrolysis , barium titanate , coprecipitation , materials science , precipitation , pyrolysis , barium , titanium , chemical engineering , solid solution , nuclear chemistry , inorganic chemistry , chemistry , metallurgy , ceramic , organic chemistry , physics , meteorology , engineering
Hydrolysis‐assisted spray pyrolysis (HASP) using dimethyl oxalate as hydrolyte was found to be applicable to precipitation of solid, spherical BaTiO 3 powder with uniform composition when the stock solution concentration was high (>1.0 M ). Solid, dense powder with uniform composition was successfully obtained because barium titanium oxalate was prepared from partial hydrolysis of dimethyl oxalate and coprecipitation of oxalate with barium and titanium during the hydrolysis–precipitation process, and then the oxalate particles became seeds in the following process. The sintered sample from the as‐prepared BaTiO 3 powder led to a higher dielectric constant and lower loss.