Giant dielectric response and magnetoelectric behavior of 95BiFeO3–5BaTiO3 (95BFO–5BT) ceramics

Abstract

A detailed study of electrical behavior of 95BiFeO 3 -5BaTiO 3 (95BFO-5BT) ceramics through comprehensive analysis of temperature and frequency dependent dielectric behavior, ac impedance and magnetodielectric (MD) properties is reported here. Addition of insulating BaTiO 3 into BiFeO 3 have exhibited enhanced dielectric and ferromagnetic responses. The remnant polarization (P r ) was found to be 6 lC/cm 2 , while the dielectric constant was found to be very high (e 0 r C 10 2 , for T C 140°C). Along with strong conductivity contribution to e 0 r , spectroscopic plots of e 0 r revealed the MaxwellWagner type relaxation in the sample, which ultimately could have led to an apparent high e 0 r in 95BFO-5BT ceramics. Origin of such a high e 0 r in BFO-BT was further investigated using impedance spectroscopy. MD studies revealed the magneto-electric coupling in the ceramics. The MD studies along with anomaly in dielectric data near antiferromagnetic ordering temperature (T N = 170°C) of BFO suggests the magnetic bearing on the electrical properties of 95BFO-5BT ceramics.