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Promising multifunctional doped BiFeO3 nanoparticles: impact of partial multi-substitution on structural transformation
Authors: Benali, EM; Saidi, L; Haddad, S; Gavinho, SR; Benali, A; Dhahri, E; Graca, MPF; Costa, BFO
Ref.: Ceram. Int. 51(22) B, 37622-37633 (2025)
Abstract: The maximal energy product (BH)max of bismuth ferrite-based nanoparticles is reported for the first time in this work, which represents a major advancement in the material`s multifunctional use. We explored the structural, magnetic, optical, and dielectric properties of multi-doped Bi0.7Ba0.2Ce0.1Fe0.9Ni0.1O3 (BBCFN10 %) nanoparticles synthesized via the Sol-Gel method, with a particle size of around 66 nm. X-ray diffraction (XRD) results confirmed the formation of a majoritarian tetragonal structure (P4/mmm space group) as it was confirmed from the Rietveld refinement. The strategic insertion of Ba2+, Ce4+, and Ni2+ ions into the BiFeO3 lattice induced a structural transformation that profoundly rised the remanent magnetization (MR), and coercive field (HC), and a 39-fold increase of the saturation magnetization (MS = 13.96 emu/g). Notably, the BBCFN10 % compound exhibited an interesting value of the maximum energy product (B.H)max of 6.716 MG Oe (53.446 kJ/m3) at room temperature, a key novelty of this study and the first reported value for any Bismuth ferrite-based material, highlighting its uses for permanent magnetic applications. Additionally, the material exhibited a colossal giant dielectric constant (epsilon´ =105) with very low dielectric tangent loss, positioning it as a strong candidate for energy storage applications. Optical absorption specified an interesting band gap of 1.74 eV correlated with the PLE spectrum peak at 712 nm, suggesting band structure modification due to substitution. Photoluminescence spectroscopy also revealed a defect-related blue emission peak at 475 nm. These results highlight the investigated compound´s substantial potential for a range of multifunctional uses.
