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Aluminium oxide is an important material in electronics due to its high conductivity (er
Several studies have shown that the permittivity of Al2O3 is mainly determined by three factors: impurity contents in starting powder, sintered density and average grain size of sintered alumina [8, 9]. In this study, two pure alumina powders (
The real and imaginary parts of the dielectric constant of aluminium oxide vary slowly with frequency at a few temperatures for sintered and quenched samples. These changes are attributed to space charge polarization and are explained using Jonscher’s power law: sac (o) = s (o) + s1(o) = sdc+Aon; 0
Moreover, the ac conductivity of both sintered and quenched samples varies with temperature in the high-temperature region. This frequency dependence is characterized by a symmetric relaxation of Z’’ with a broad distribution of relaxation times that is attributed to a non-Debye type relaxation mechanism in both materials.
