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 (2Pr)(2Pr) and the coercive field (2Ec)(2Ec) of Bi5FeTi3O15 samples were about 11.8 μC/cm2 and 270 kV/cm, respectively. The BFTO samples show a weak ferromagnetism with Mr≈1.36×10−6emu/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 tanδ−Ttanδ−T curves. The peak at lower temperature (∼400 ∘C) behaves relaxation characteristic, with the activation energy (H)(H) of about 1.62 eV and the upper peak is frequency independent.