Dielectric properties of sintered BaTiO3 prepared from barium acetate and titanium dioxide

Abstract

Abstract In this paper, we investigated the densification, microstructure and dielectric properties of BaTiO3 derived from aqueous barium acetate and titanium dioxide mixture in both the unmilled and milled forms. The sintered pellets showed a great difference in the microstructure and dielectric properties between the milled and unmilled ones. The unmilled samples showed broadening in the permittivity peaks at Curie temperature and a higher permittivity value (5630) at room temperature. They exhibit a dielectric relaxor-like behaviour and relatively stable permittivity. This was attributed to the presence of a thin shell layer of barium-rich phase at the grain boundaries. Despite milling gives a better homogeneity, it destroys the shell layer and results in a classic barium titanate dielectric behaviour.

Keywords

• Barium titanate
• barium acetate
• dielectric properties
• sintering & microstructure