Electrical and magnetic properties of Bi5FeTi3O15 compound prepared by inserting BiFeO3 into Bi4Ti3O12

A novel four-layer Bi5FeTi3O15(BFTO) compound was synthesized via sintering the mixture of Fe2O3, Bi2O3 oxides and already-prepared Bi4Ti3O12 powders. At room temperature, the remnant polarization ( 2 P r ) and the coercive field ( 2 E c ) of Bi5FeTi3O15 samples were about 11.8 μC/cm2 and 270 kV/cm, respectively. The BFTO samples show a weak ferromagnetism with M r ≈ 1.36 × 1 0 − 6 emu / g . A sharp dielectric peak was found, showing that the arrangement of iron ions in each crystal unit may be relatively in order. Two peaks were found in the tan δ − T curves. The peak at lower temperature (∼400 ∘C) behaves relaxation characteristic, with the activation energy ( H ) of about 1.62 eV and the upper peak is frequency independent.