Impedance and modulus spectroscopy of ZrO2eTiO2eV2O5nanocomposite

Abstract

High-k ZrO2eV2O5eTiO2nanocomposite prepared by coprecipitation-calcination method was investigated by impedance andmodulus spectroscopy over a frequency range of 50 Hze5 MHz, for different temperatures. Distinct peaks at characteristic fre-quencies were obtained. The shifting of the peaks towards high frequency with increase in temperature indicated a temperaturedependent relaxation in the nanocomposite. Complex impedance formalism showed that the maximum value of the impedancedecreases as temperature increases suggesting that the sample had negative temperature coefficient of resistance. The electricanalysis confirms the findings of the impedance analysis. The fmaxvalues for Z00and M00are different confirming non-Debye type ofrelaxation. The values of activation energies based on impedance and modulus relaxation were calculated and were equal to 1.02 eVand 0.51 eV respectively.