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Evaluation of Dielectric Permittivity of Barium Titanate Fine Powders

Dielectric permittivity (e r ) of BaTiO 3 (BTO) powders was determined by measuring e r of slurries prepared from BTO powder and propylene carbonate as dispersion medium, followed by analyzing with a finite element methods (FEM). The e r of powders depended on their characters such as tetragonality ( c / a ratio), density, particle size and specific surface area. In order to extract the effect of each character, a statistical analysis was carried out to represent the e r of powders with an empirical formula, where the c / a ratio, density and particle size were used as parameters. A fairly good agreement between observed data and those expected from the formula was obtained and the contribution of each character to the e r could be determined.