Preparation and dielectric properties of thermo-vaporous BaTiO3 ceramics

Abstract

A crystalline BaTiO3 powder was synthesized at 350 °C for 0-20 h from TiO2 (> 99 % purity) and BaO (> 98 % purity) with water vapour acting as the reaction media. According to the XRD and SEM results, the BaTiO3 synthesized for 3 h proved to be the most adequate raw material for ferroelectric ceramics among the obtained samples as long as it consisted of pure crystalline sphere-shaped BaTiO3 particles with the average size of 156 nm. Pellets were pressed at (100, 150 and 200) MPa and sintered at 1300 °C for 1 h. The influence of the compacting pressure on the dielectric characteristics of BaTiO3 ceramics was studied by monitoring the permittivity and loss-tangent values of the pellets at 20 Hz-2 MHz.