Enhanced dielectric and multiferroic properties in BaTiO3 doped Bi0.85Nd0.15Fe0.98Mn0.02O3 ceramics

• Published in: Journal of magnetism and magnetic materials Vol. 494; p. 165779
• Main Authors: Zhao, Haoting, Yang, Ruxia, Li, Yang, Liu, Gang, Lu, Yuming, Tang, Jianfeng, Zhang, Sam, Li, Guannan
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.01.2020; Elsevier BV
• Subjects: Barium titanates; BiFeO3; Ceramics; Crystal structure; Dielectric loss; Dielectric properties; Dielectric relaxation; Diffraction patterns; Electric fields; Ferroelectric materials; Ferroelectric properties; Ferroelectricity; Ferromagnetism; Grain size; Hysteresis; Leakage current; Magnetic properties; Multiferroic materials; Permittivity; Solid phases; Temperature dependence; BiFeO3; Ferroelectric properties; Dielectric properties; Magnetic properties
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2019.165779

•Both dielectric properties and ferroelectric properties are improved.•The leakage current density is significantly reduced with the addition of BaTiO3.•XPS spectra was used in all the samples for analyzing the valence states of Fe ions. The multiferroic ceramics of (1-x) Bi0.85Nd0.15Fe0.98Mn0.02O3-x BaTiO3 (x = 0, 0.275, 0.3 and 0.325) were prepared by the conventional solid phase reaction. The crystal structure, microstructure, dielectric, ferroelectric and magnetic properties were systematically investigated. The X-ray diffraction pattern indicates that the structure of Bi0.85Nd0.15Fe0.98Mn0.02O3 is rhombohedral and the space group is R3c. Rietveld refinement shows that with the introduction of BaTiO3, the crystal structure of the material transformed from rhombohedral (R3c) to pseudo-cubic (P4mm). Scanning electron microscopy analysis shows that the average grain size decreases with the introduction of BaTiO3. Temperature dependence of the dielectric constant and the dielectric loss indicate that the introduction of BaTiO3 leads to ferroelectric relaxation. The dielectric constant and the dielectric loss are improved in sync. The leakage current density is reduced by about two orders of magnitude under the electric field of 15 kV/cm. The ferroelectricity and ferromagnetism are greatly improved after the addition of BaTiO3 seen from the polarization hysteresis (P-E) loops and the magnetization hysteresis (M-H) loops.