Dielectric properties, complex impedance analysis and electrical properties of novel particulate composites of NBT-SrFe12O19

Abstract

The proposed article describes the use of dielectric and complex impedance spectroscopy to evaluate various parameters such as electrical conductivity, activation energy, grain-grain boundary parameters, etc., of the (1−x)Na0.5Bi0.5TiO3–(x)SrFe12O19; (x = 0.5, 0.8 and 1) novel composite system formed with the help of solid-state reaction method. The composite samples have been achieved with modified and enhanced dielectric and electrical properties as compared to the pure ferroelectric and hexaferrite phase before making their composites. Both the regions of low dielectric constant and higher dielectric constant reveal the presence of Maxwell–Wagner polarization. The distribution relaxation time, Cole–Cole plot, and comparison of Modulus and impedance plot disclose the presence of space charge polarization and constant phase element justifying the semiconductor behavior of the samples. The overlapped normalized impedance curve on a single master curve confirmed the presence of relaxation phenomena in the samples and revealed that the samples follow a single relaxation phenomenon at all the temperatures. Jonscher’s power law has been used to find different models of conduction.