Magnetic and optical properties of MgMnO3−-modified Bi0.5Na0.5TiO3 materials

Abstract

Abstract The phase structural, optical and magnetic properties of a new (1 − x)Bi0.5Na0.5TiO3 + xMgMnO3−δ compound were investigated. The MgMnO3−δ -modified Bi0.5Na0.5TiO3 materials were fabricated using sol–gel method. Results of X-ray diffraction and Raman scattering indicated that the MgMnO3−δ materials were good solid solutions in the Bi0.5Na0.5TiO3 compound. The random distribution of Mg and Mn cations in the host lattice of Bi0.5Na0.5TiO3 materials reduced the optical band gap from 3.11 eV to 1.99 eV for 9 mol% MgMnO3−δ-modified Bi0.5Na0.5TiO3 materials. The complex magnetic behaviour in MgMnO3−δ-modified Bi0.5Na0.5TiO3 materials was obtained. The weak ferromagnetism vs. diamagnetism transformed to ferromagnetism vs. para/antiferromagnetic property depending on the concentration of MgMnO3−δ solid solution in Bi0.5Na0.5TiO3 samples. Our work can further contribute to the study of current injection ferromagnetic material in host lead-free ferroelectric materials for smart electronic device application.