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
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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