Effect of TiO2 on Electrical Properties of ZnCr2O4 Synthesized by Conventional Ceramic route

Abstract

The electrical properties of ZCO-TO composite are studied properly by analysing the impedance data taken at RT within frequency windows of 100 Hz to 1 MHz. The presence of TO particles in the matrix of ZCO is confirmed from XRD study as it contains the peaks of both compounds. This indicates the formation of desired composite. SEM image shows the grain growth with percentage addition of TO. The size of the grain has put impact on the electric properties of the composite observed from impedance study. The impedance value decreases up to 40% addition of TO and then it increases again. Nyquist plots show the co contribution of grain and grain boundary with the electrode effect contributes towards conduction and polarisation mechanism.Space charge polarisation is responsible for rise in relative permittivity value.