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Synthesis of Ultrafine and Spherical Barium Titanate Powders Using a Titania Nano‐Sol
Author(s) -
Lee Jai Joon,
Park Kum Jin,
Hur Kang Heon,
Yi Sung Chul,
Koo Sang Man
Publication year - 2006
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.1551-2916.2006.01220.x
Subject(s) - materials science , tetragonal crystal system , barium titanate , chemical engineering , particle size , porosity , aqueous solution , ceramic , annealing (glass) , sol gel , mineralogy , nitric acid , titanium , dielectric , composite material , metallurgy , nanotechnology , crystal structure , crystallography , chemistry , engineering , optoelectronics
A novel synthetic method for the preparation of spherical, homogeneous, and ultrafine barium titanate (BaTiO 3 ) powders is described. An aqueous titania nano‐sol was prepared by peptizing coarse aggregate of hydrous titania with nitric acid. BaTiO 3 powders could be synthesized through a simple reflux method using the titania nano‐sol and barium hydroxide. As decreasing the titanium concentration, the particle size of the resulting spherical BaTiO 3 powder was increased from 40 to 130 nm and the porosity also increased. It was revealed that the smaller as‐prepared BaTiO 3 powder was less porous and became more tetragonal with less intragranular pores after annealing. With this method, a highly tetragonal BaTiO 3 powder ( c / a ∼1.008) with a particle size of 120.0 nm was successfully prepared and would be very suitable for the thinner dielectrics in higher capacitance multilayer ceramic capacitors.