AC conductivity and dielectric properties of (Bi,Na)TiO3-BaTiO3 lead free ceramics

Abstract

(Bi,Na)TiO3 (BNT) based ceramics have been extensively investigated for electronic device applications. BNT is ferroelectric material with ABO(3) perovskite structure. BNT ceramics have high Curie temperature (T-c = 320 degrees C) and remanent polarization (P-r=38 mu C/cm(2)). Despite its relatively high coercive field (E-c=7.3 kV/mm) and low piezoelectric constant (d(33)=83 pC/N). Temperature and frequency dependent relative dielectric permittivity and loss tangent can play an important role in the device performance. To analyze the dielectric characteristics across wide temperature (303-403 K) and frequency range (1 kHz to 3 MHz), AC conductivities of (1-x)(Bi0.5Na0.5TiO3)-x(BaTiO3) (x=0, 0.02, 0.04, 0.06, 0.08, or 0.10) were measured and analyzed. The conduction mechanism was evaluated through simulations and calculations based on an Arrhenius-type equation. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.