Preparation and characterization of nanometer-sized barium titanate powder by complex-precursor method

Abstract

A new complex-precursor method was proposed to prepare nanometer-sized BaTiO₃ powder. Firstly, [Ti₂O(O₂)₂(ta)₂]⁴⁻ complex ions were prepared by the reaction of H₂O₂, Ti⁴⁺ and ta³⁻ (ta=[C₆H₆O₆N]³⁻) with a desirable amount of surface active agent, and then the Ba₂[Ti₂O(O₂)₂(ta)₂]·2H₂O precursor was obtained by reaction between [Ti₂O(O₂)₂(ta)₂]⁴⁻ and Ba²⁺. Finally, the precursor was annealed at 800 °C for 2 h to obtain BaTiO₃ powder. The morphology, the particle size distribution, the purity and the molar ratio of Ba to Ti of BaTiO₃ powder were investigated systematically by TEM, XRD, IR, Raman and chemical analysis, respectively. The results show that the BaTiO₃ powders with the grain size of about 40 nm have a tetragonal crystalline structure at room temperature and a spherical morphology.

Keywords

barium titanate / complex-precursor method / synthesis / nanometer-sized powder

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