The polarization phenomenon of EPR without filler at high temperatures

We are studying the dielectric properties of EPR with and without filler. In this paper, we investigate the electrical conductivity and the discharge current of EPR without filler at high temperatures from 60 to 90°C. We obtain three parameters α, τ₀ and ε_r0-ε_r∞, from the curve fitting of the experimental results for the discharge currents to the theoretical equation. The parameters, α and ε_r0-ε_r∞, are almost independent of temperature. In contrast, the characteristic relaxation time, τ ₀, decreases with increasing temperature. The activation energies for the electrical conductivity and relaxation time are 0.74 and 0.89 eV, respectively, being close each to each. Therefore, it is suggested that the dielectric relaxation is associated with the conduction process