Effect of Bi³⁺ and Fe³⁺ Ions Substitution on Electrical Response of BaTiO₃ Ceramic

Abstract

In this study we have synthesized the iron and bismuth co-substituted BaTiO3 ceramic, with the general formula: Ba0.95Bi0.05Ti1-xFexO3 for x=0.00 to 1.00, by solid state route. The impedance and electrical properties of these materials were investigated. The dispersion in conductivity in these ceramics can be described by Jonscher's power law and suggests a mechanism of conduction that is related to the Correlated Barrier Jump (CBH) model, according to which charge transport occurs between localized states due to a jump of the potential barriers. The conductivity results confirmed the semi-conductor behavior of these ceramics at high frequency region. The Nyquist plots for the different ceramics confirmed the simple electrical relaxation phenomena with the presence of a Debye-type relaxation phenomenon for x<040 of Fe content. While above this rete, the relaxation behavior is transformed into a Non-Debye phenomenon.