Electrical Properties of Rare Earth Double Perovskite Sr2CeSbO6

The double perovskite oxide strontium cerium antimonate, Sr2CeSbO6 (SCS) is synthesised by solid state reaction technique. Thermal behaviour of SCS are investigated using thermogravimetric analyser and differential scanning calorimeter in the temperature range from 303 to 1500 K. Dielectric relaxation spectroscopy is used to investigate the frequency dependent dielectric relaxation in SCS in the frequency range from 100 Hz to 1 MHz and in the temperature range from 303 to 703 K. The frequency dependent electrical data are analysed by impedance formalism. The relaxation mechanism of the sample is modelled by Davidson-Cole equation (modified Debye equation). The frequencies corresponding to the maxima of imaginary part of impedance at the various temperatures are found to obey the Arrhenius law with activation energy similar to 0.15 eV. The scaling behaviour of imaginary part of impedance suggests that the relaxation describes the same mechanism at various temperatures.