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Dresden 2011 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 12: Poster

DF 12.4: Poster

Wednesday, March 16, 2011, 15:00–17:30, P1

Preparation of nano-crystalline BaTiO3 powder in a sol-precipitaion process — •Yanling Gao, Vladimir Shvartsman, and Doru C. Lupascu — Institut für Materialwissenschaft, Universität Duisburg-Essen, Essen, Germany

We are trying to synthesize uniform-sized nanoparticles having a high dielectric permittivity to be used in conjunction with conducting polymer in order to alter the electric properties of the latter. For this purpose, the synthesis of hydrophobic nano-crystalline BaTiO3 is investigated. Cubic and hydrophobic BaTiO3 nanopowders with a size below 20 nm were directly synthesized by sol-precipitaion under alkaline conditions at 100C using the water - insoluble titanium (IV) isopropoxide oleate (Ti(OR)4−x(RCOO)x) precursor. The latter prepared by reacting titanium (IV) isopropoxide with oleic acid. The crystallinity and phase purity of the nanopowders were studied with X-ray diffraction spectrometry (XRD). The size and the microstructure of the BaTiO3 nanopowder were analysed by Scanning Electron Microscopy (SEM). The XRD pattern of as-precipitated nanopowders showed weak and broad reflections characteristic of crystalline BaTiO3 with evidence of the presence of BaCO3. The as-prepared nanopowders were calcined at 500C/6hrs in air to obtain perovskite of BaTiO3 phase. The obtained BaTiO3 were further pressed into pellets and sintered at 950C/4hrs in air to get dense ceramics. Dielectric properties of these ceramics are measured as a function of temperature.

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