Synthesis of ultrafine and spherical barium titanate powders using a titania nano-sol

Jai Joon Lee, Kum Jin Park, Kang Heon Hur, Sung Chul Yi, Sang Man Koo

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A novel synthetic method for the preparation of spherical, homogeneous, and ultraflne barium titanate (BaTiO3) powders is described. An aqueous titania nano-sol was prepared by peptizing coarse aggregate of hydrous titania with nitric acid. BaTiO3 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 BaTiO3 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 BaTiO3 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.

Original languageEnglish
Pages (from-to)3299-3301
Number of pages3
JournalJournal of the American Ceramic Society
Issue number10
StatePublished - 2006 Oct 1

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