Dielectric Properties of Fine Grains Barium Titanate Ceramics Prepared by Mechanochemical Synthesis

Description

This item was taken from the IEEE Conference ' Dielectric Properties of Fine Grains Barium Titanate Ceramics Prepared by Mechanochemical Synthesis ' Barium titanate was prepared by the advanced procedure of mechanochemical synthesis from barium and titanium oxides after 50 hours of milling. The X-ray examination of the milled powders showed the phase evolution during synthesis and the perovskite phase was initiated after 5 hours and was completed after 50 hours. Sintered samples from these nanopowders show different dielectric properties for fine and coarse grained ceramics. Samples with an average grain size of 2 ¿m showed the highest dielectric constant of 5800 at room temperature. A sharp maximum of the dielectric constant with values of about 16000 was recorded at the Curie temperature.