Room-temperature ferromagnetism in Fe-based perovskite solid solution in lead-free ferroelectric Bi_(0.5)Na_(0.5)TiO_3 materials

摘要

The integration of ferromagnetism in lead-free ferroelectric materials is important to fabricate smart materials for electronic devices. In this work, (1 − x)Bi0.5Na0.5TiO3 + xMgFeO3-δmaterials (x = 0–9 mol%) were prepared through sol–gel method. X-ray diffraction characterization indicated that MgFeO3-δmaterials existed as a well solid solution in lead-free ferroelectric Bi0.5Na0.5TiO3materials. The rhombohedral structure of Bi0.5Na0.5TiO3materials was distorted due to the random distribution of Mg and Fe cations into the host lattice. The reduced optical band gap and the induced room-temperature ferromagnetism were due to the spin splitting of transition metal substitution at theB-site of perovskite Bi0.5Na0.5TiO3and the modification byA-site co-substitution. This work elucidates the role of secondary phase as solid solution in Bi0.5Na0.5TiO3material for development of lead-free multiferroelectric materials.