Electrical Characterization by Impedance Spectroscopy of Double Perovskites of Y2NiMnO6 Ceramics

Impedance spectroscopy was used in order to investigate the electric properties of double perovskites of the Y 2 NiMnO 6 ceramics, which were prepared by thermal decomposition at 800 °C for 6 h followed by sintering at 1400 °C for 6, 12, 18 and 24 h. Consequently, the electric characterization of the Y 2 NiMnO 6 ceramics was performed at temperature from -50 to 200 °C, in the frequency range from 10 2 to 10 8 Hz. Results in the activation energy relaxation ( ) are significantly increased from 0.1723 to 0.3813 eV and the conductivity activation energy ( ) in the grain boundary are dramatically increased from approximately 0.3599 to 0.6260 eV at 24 h. Dispersion was observed in the variation of impedance values with frequency. Possible reasons for these observations are discussed.