C. MICLEA, C. TĂNĂSOIU, I. SPÂNULESCU, C. F. MICLEA, A. GHEORGHIU, L. AMARANDE, M. CIOANGHER, C. T. MICLEA
Microstructure and Properties of Barium Titanate Ceramics Prepared by Mechanochemical Synthesis

Abstract. The new advanced procedure of mechanochemical synthesis was used to prepare barium titanate from barium and titanium oxides. The X-ray examination of the powders milled for different times showed the phase evolution during synthesis. The perovskite phase was initiated after 5 hours of milling and was completed after 50 hours. Sintered samples from these nanopowders show different dielectric properties depending on their morphostructure. Thus for samples with an average grain size of 2 µm we obtained the highest dielectric constant of 5 800 at room temperature. A sharp maximum of the dielectric constant with values of about 16 000 was recorded at the Curie temperature.

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