Improved dielectric and ferromagnetic properties of Fe-site substituted rhombohedral structured BiFeO3 ceramic

• Published in: Journal of alloys and compounds Vol. 701; pp. 43 - 48
• Main Authors: Khasskhoussi, G., Abdelkafi, Z., Khelifi, H., Abdelmoula, N., Mezzane, D., Khemakhem, H.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.04.2017
• Subjects: Dielectric response; Magnetic properties; Raman spectroscopy; X-ray diffraction; Dielectric response; X-ray diffraction; Raman spectroscopy; Magnetic properties
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2017.01.120

We prepared BiFe0.95(Ni0.5Ti0.5)0.05O3 by the conventional solid-state reaction method. X-ray diffraction along with the Rietveld-refinement revealed the existence of a rhombohedral R3c symmetry in BiFe0.95(Ni0.5Ti0.5)0.05O3. The dielectric permittivity was investigated over a wide range of temperatures at 1 kHz. During its evolution, an anomaly was observed at 520 K, which corresponds to TN (antiferromagnetic transition temperature). The prepared ceramic exhibited a considerable improvement in dielectric properties compared to pure BiFeO3. From the magnetization dependence at room temperature, BiFe0.95(Ni0.5Ti0.5)0.05O3 enhanced magnetization (Mr ≈ 0.026 emu/g) and reduced the coercive field (Hc ˜ 110 Oe) compared to BiFeO3. BiFe0.95(Ni0.5Ti0.5)0.05O3 ceramic is ferromagnetic with a cluster-glass state unlike the antiferromagnetic BiFeO3-based compounds. The Raman study confirmed the X ray diffraction analysis, the dielectric measurement and magnetic one. •BiFe0.95(Ni0.5Ti0.5)0.05O3 multiferroic was prepared by solid-state reaction.•The Ni/Ti co-substitution into BiFeO3 enhanced their magnetic and dielectric properties.•Ti4+ is responsible for the improvement of dielectric and magnetic properties of BiFeO3.•Ni2+ is responsible for the improvement of the magnetic properties of BiFeO3.