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SOL-GEL SYNTHESIS AND CHARACTERIZATION OF BaTiO3 POWDER

M. Cernea1,*

Affiliation

  1. National Institute for Physics and Technology of Materials, 77125 Magurele-Bucharest, P.O. BOX: MG-7, Romania

Abstract

Barium acetylacetonate and titanium (IV) isopropoxide, dissolved in adequate solvents, were used to produce stoichiometric BaTiO3. The purity of the gel powder was >99.98 %. The particle size range was 80 nm for the dried gel powder and 1-1.5 mm for the powder calcined at 950 °C. X-ray analyses indicates that the material calcined at 950 °C in air or, at 825 °C under vacuum, exhibits a tetragonal, poorly crystallized, BaTiO3 structure. The powder pressed and sintered at 1275 °C show high dielectric constants, i.e. 1300 at 25 °C and, 3020 at the Curie temperature (104 °C). The melting point for BaTiO3 prepared by sol-gel technique is 1290 °C..

Keywords

Barium titanate, Sol-gel, Dielectric constant.

Submitted at: July 21, 2005
Accepted at: Nov. 24, 2005

Citation

M. Cernea, SOL-GEL SYNTHESIS AND CHARACTERIZATION OF BaTiO3 POWDER, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 6, pp. 3015-3022 (2005)