Synthesis, Structure, and Dielectric Properties of BaTiO3 Nanoparticles

We synthesized nano-sized barium titanate (BaTiO3) powders by using the solvothermal method and characterized them by XRD and TEM. Precursor BaTi(OR)6 was obtained by mixing with Ba(OR)2 and Ti(OR)4 in benzene and aging. Average size of the synthesized nanoparticles was determined to be less than 20 nm from a TEM image. FWHM in XRD analysis indicates that the nanoparticles have both cubic and tetragonal phases. We prepared the samples in plate form and obtained the complex dielectric spectra by measuring the dielectric properties of the BaTiO3 nanoparticles in a frequency range from 101 to 106 Hz and in a temperature range from room temperature to 300 C, respectively, with an impedance analyzer. Although the bulk BaTiO3 crystals show the ferroelectric phase transition around 120 C, the synthesized BaTiO3 nanoparticles show the ferroelectric phase transition around 60 C accompanied by low-frequency dielectric dispersion. KCI Citation Count: 11