Effect of Nd3+ substitution for Bi3+ on the dielectric properties and conduction behavior of Aurivillius NdBi4Ti3FeO15 ceramics
Abstract
NdBi4Ti3FeO15 and Bi5Ti3FeO15 ceramics were prepared by solid state reaction. The effect of Nd3+ on dielectric and electrical properties was investigated in a wide range of frequencies and temperatures by dielectric/impedance spectroscopies. The combination of impedance and electric modulus analysis enabled the distinguishing of two relaxation behaviors that were assigned to originate from grains and grain boundaries. Kinetic analysis of temperature-dependent dielectric data was performed to probe the defect-related conduction. The results demonstrated that the Nd3+ substitution for Bi3+ significantly suppressed the conductivity and the ferroelectric transition temperature was decreased to ∼250 °C in NdBi4Ti3FeO15.