Measurements of Dielectric Constant and Conductivity of Powders Using Two-Phase Mixture System

Abstract

Measurements of dielectric constant and conductivity have been made on various ceramic powders using a two-phase mixture system. BaTiO₃, TiO₂ and ZnO powders were examined in the present study.
The dielectric constant and conductivity of two-phase mixtures, which consisted of the powders and paraffine wax chosen as a dispersion medium, were both found to be described by a logarithmic mixture rule. By extrapolation in logarithmic rule plots of the mixtures to the end members, the dielectric constants and the conductivities of the powders used here were obtained as follows: Dielectric constant (at 500kHz); BaTiO₃(1000-2000), TiO₂(∼100), ZnO(∼10). Conductivity (ohm^-1 cm^-1); BaTiO₃(∼3x10^-10), TiO₂(∼1x10^-10), ZnO(∼1x10^-4).