Multiferroism and enhancement of material properties across the morphotropic phase boundary of BiFeO3-PbTiO3

摘要: Strong phase-change magnetoelectric responses have been anticipated by a first-principles investigation of phases in the perovskite BiFeO3-BiCoO3 solid solution, specifically at morphotropic phase boundary (MPB) between multiferroic rhombohedral and tetragonal polymorphs. This might be general property MPBs novel promising approach for room temperature magnetoelectricity, which requires identification suitable material systems. We present here comprehensive description electrical electromechanical properties across one such system; BiFeO3-PbTiO3 solution. All dependence dielectric permittivity, ferroelectric hysteresis loops, piezoelectric coefficients obtained, are discussed relation to previously reported structural evolution. Results show ceramic materials very random access memories (remnant polarization as high 63 μC cm−2 with comparatively low coercive field 4.5 kV mm−1 MPB compositions) transduction (crystal coefficient 87 pC N−1 Curie above 873 K). Moreover, occurrence changes monoclinic polymorphs under electric fields is indicated, while canted antiferromagnetic character involved corroborated.