Electric and dielectric properties of copper-chromium layered double hydroxide intercalated with chloride ion using impedance spectroscopy

Abstract

The aim of this work is the study of dielectric and electrical performance of a dielectric anionic clay based on copper and chromium, and intercalated by chloride ions. Dielectric was synthesized by soft chemistry using the coprecipitation method at room temperature. The analysis of physicochemical properties of the material is performed by X-ray diffraction, Fourier transform-infrared, thermogravimetric analysis, and inductively coupled plasma.As for the dielectric response, it was performed using the dielectric impedance spectroscopy. Two relaxation modes were detected at the Nyquist diagrams. Modelization with equivalent circuit allowed us to determinate intrinsic electrical parameters of the dielectric (resistance, capacity) corresponding to the two contributions. The evolution of the dielectric constant with the frequency gave values comparable to the dielectrics. Finally, an adjustment according to Jonscher law was developed to determine the value of residual conductivity generally present in dielectrics, also called dc conductivity.