Study of conduction mechanism, electrical property, and nonlinear electrical behaviors of Ba0.97Bi0.02Ti0.9Zr0.05Nb0.04O3 perovskite

Abstract

The conduction mechanism, electric properties, and I–V behavior of the polycrystalline Ba0.97Bi0.02Ti0.9Zr0.05Nb0.04O3 (BBTZN) ceramic analyzed as a function of frequency and temperature. The relaxation phenomena were studied with impedance and modulus formalism, while the conductivity mechanism was investigated using electrical conductivity. The thermal evolution of the electrical conduction was adjusted by Jonscher’s Law and explained in terms of the Correlated Barrier Hopping conduction mechanism. The nonlinear current–voltage confirmed the negative temperature coefficient of resistance comportment for our compound. The electrical behavior confirmed that the relaxation processes are of non-Debye type. The study of complex impedance suggests a poly-dispersive non-Debye-type relaxation occurring in the polycrystalline (BBTZN). The dielectric response confirmed the dominance of the Maxwell–Wagner (M–W) model effect in conduction phenomenon. The value of permittivity is highly around 103, and low dielectric loss and low electrical conductivity of around 10–4 S cm−1 for BBTZN were observed. These values make this composition interesting for microelectric applications. In the thermal study, the relaxation processes observed by electrical conductivity, impedance, and modulus are associated with singly and doubly ionized oxygen vacancies for the lower and higher temperature, respectively.