Abstract
Activation energies (Ea) for electrode and grain boundary (GB) conduction are found to be greater than that of the bulk conduction. This implies that both electrode and GB act as two insulating barriers affecting conductivity and dielectric relaxations in KxTiyNi1−x−yO. Decrease in Ea for electrode conduction above T>295K leads to relatively greater loss due to the dc-charge transportation between electrodes and dielectric. The Cole-Cole equation has been modified to explain ε′ over a wide range of frequency (10–107Hz). Impedance spectroscopic study has also been employed to distinguish electrode relaxation from GB relaxation.
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