Structural, Magnetic, Relaxor Ferroelectric and Magnetoelectric Coupling Properties in Aurivillius Phase Bi6La3Ti3Fe5O27

Polycrystalline ceramics of Bi6La3Ti3Fe5O27 (BLTF) were prepared by a sol–gel method. Structural, magnetic, relaxor ferroelectric and magnetoelectric coupling properties were investigated. Studies indicate that the prepared sample has a plate-like shape structure with a thickness of 160–170 nm and a diameter of 2 µm. La substitution has been shown to effectively induce the room temperature combining of ferroelectricity and ferromagnetism, thus indicating a promising way for improving multiferroic properties of antiferromagnetic Bi9Ti3Fe5O27. Two dielectric relaxations were observed in the temperature ranges of 500–590 and 600–650 K in BLTF ceramics. In addition, the magnetoelectric coupling effect between charge and spin ordering was determined by measuring the relative change of the ferroelectric polarization and dielectric constant in external magnetic field.