Investigation of Metal Electrode Effect on Electrical Conductivity of [KNbO3]0.9 – [BaNi0.5Nb0.5O3]0.1 Ceramics by Impedance Spectroscopy
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Abstract
Perovskite ceramic of [KNbO3]0.9 – [BaNi0.5Nb0.5O3] 0.1 (KBNNO) was fabricated using the solid-state combustion technique. KBNNO was sandwiched among different metal electrodes to investigate the electrical conductivity behavior. From the impedance spectroscopy, the dispersion of impedance curves was found with the increase of frequency as well as heating temperature. This observation indicated that KBNNO ceramic exhibits dielectric relaxation phenomenon. The equivalent grain resistance value obtained from the impedance analysis significantly decreased after changing the electrode from indium tin oxide (ITO) to Ag, indicating the influence of active electrode on ceramic conductivity. The possible reason was due to the low resistivity of Ag electrode as compared with ITO. This suggested that the electrical charge would easily transfer to external load. The presented results were essential for making a new route to investigate the electrical properties of KBNNO-based material, and further develop novel electroceramics.
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