Effect of annealing temperature on dielectric properties of iron oxide prepared by sol-gel auto combustion method

In this study, different phases of iron oxide have been synthesized by sol-gel auto combustion route followed by annealing. Temperature and frequency-dependent dielectric properties have been studied in detail which provide the information on the contribution of grain and grain boundary in charge transport. Conductivity and electric modulus spectra have also been analyzed. The scaled coordination of impedance spectrum merges in a single master curve which signifies that the distribution of relaxation time is temperature independent. Complex impedance spectra have been used to evaluate activation energy (E-a ) by using Arrhenius relation. The activation energy calculated for alpha-Fe2O3 is 1.36 eV.

Automated summary

Different phases of iron oxide were successfully synthesized by sol-gel auto combustion route in this study, and the temperature and frequency-dependent dielectric properties were carefully studied to understand the contribution of grain and grain boundary in charge transport. The activation energy for α-Fe2O3 was calculated as 1.36 eV using complex impedance spectra, showing that the distribution of relaxation time is temperature independent.