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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 82  2023
Impedance Spectroscopy Characterization of ZnCo2O4 Ceramics Obtained by the Sol-Gel Method
Sukru Cavdar,a,* Yesim Demirolmez,a Neslihan Turan,a Haluk Koralaya and Nihat Tugluoglub
Pages : 136-142
DOI : 10.1080/0371750X.2023.2205600
Abstract
In this article, structural, morphological and electrical properties of ZnCo2O4 ceramics sample were studied. ZnCo2O4 nanoparticles were synthesized using sol-gel method. Structural and morphological properties of the sample were analyzed using X-ray diffraction and scanning electron microscope. Conductance, capacitance and impedance spectroscopy characterization of ZnCo2O4 ceramics sample were analyzed in 3 kHz-1.5 MHz frequency range and 300-500 K temperature range. Nyquist diagrams of impedance and the equivalent circuit were studied for ZnCo2O4 ceramics in the temperature range of 300-500 K. Cole-Cole curves of the impedance data were found to show a semicircular arc in both low and high temperature areas, which is expressed by the equivalent electrical circuit Rs (RgCg )(RgbQCgb). Relaxation behavior was identified to be of nonDebye type. The Cole-Cole curve showed the negative temperature coefficient of resistance type behavior. Values of the activation energy corresponding to relaxation processes were found as 0.054 eV below 360 K and 0.561 eV above 360 K. [Keywords: ZnCo2O4 , Sol-gel method, Impedance spectroscopy, Frequency, Temperature]
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