Dielectric and Frequency Dependent Transport Properties of Gadolinium Doped Bismuth Ferrite

Ceramics of (Bi1-xGdxFeO3) [x = 0.5, 0.6 and 0.7] were synthesized through mixed oxide method. Structural studies of the ceramics were done using X-ray diffraction technique. At high frequency, nearly flat response in the dielectric constant and dielectric loss with temperature up to 200 degrees C were observed. Dielectric constant found to increase with decrease in Gadolinium concentration. Frequency dependent electrical data analysis at different temperatures suggested a temperature dependent non-Debye type relaxation process in the ceramics. Frequency dependence AC conductivity at different temperatures obeyed Jonscher's universal power law. The temperature dependence of DC and AC conductivity was fitted with Arrhenius equation. The activation energies at different temperature ranges were calculated to understand the conduction process.