Dielectric behavior and ac conductivity in Aurivillius Bi4Ti3O12 doped by antiferromagnetic BiFeO3

Bi5Ti3FeO15 ceramics were synthesized by the solid state reaction. XRD analysis shows a single phase perovskite structure with no impurities identified. Two obvious dielectric anomalies around 1007 and 1090 K were exhibited by this material, indicating that there are two phase transitions. While no peak was found in the tanδ–T curve. In addition, the conduction loss activation energies calculated at 476–639 K, 652–966 K, and 980–1095 K are 0.156, 0.262, and 0.707 eV, respectively. Polarization versus electric field hysteresis loops associated with 2Pr2Pr of 6.08 μC/cm2 and 2Ec2Ec of 59 kV/cm were obtained.

► Bi5Ti3FeO15 was prepared by the solid state reaction and characterized by XRD.
► Two dielectric anomalies around 1007 and 1090 K were exhibited in Bi5Ti3FeO15.
► Different conduction mechanisms resulted in different activation energies.