Characterization, Frequency Response of Conductivity and Dielectric Properties of Cunanoferrite Prepared by Sol-gel Method

In this paper, we synthesized copper ferrite nanocrystals using sol-gel method. We first perform XRDanalysis and scan SEM image to verify its cubic spinal structure and nano size grains, respectively. Conductivity,dielectric function, electrical module, and impedance are measured in different frequencies and temperatures. We showthat the dielectric properties are compatible with the Maxwell-Wagner model. Conductivity has been discussed in termsof localized hopping mechanism and good obedience of Jonscher’s law is observed. The electrical modulus showsrelaxation of interfacial polarization. In Impedance spectroscopy, we observed effect of grain boundary and comparedresults with calculated theory model. By increasing temperature, capacity and conduction increase which shows that thepolarization process become easier. Also, relaxation times are shifted to smaller values that represent increase ofelectrons mobility.

کلیدواژه ها:

Ferrites ، Sol-gel process ، Ac conductivity ، Dielectric function ، Electrical modulus