Effect of Eu Doping on Structural, Optical and Magnetic Properties of BiFeO3 Materials
Main Article Content
Abstract
Bi1-xEuxFeO3 (BEFO) (x = 0.00 ÷ 0.10) materials were prepared by sol-gel method. The crystal structural, Raman scattering, magnetic and optical properties of BEFO were investigated by X-ray diffraction (XRD), Raman scattering spectroscopy, magnetic hysteresis (M-H) loops and fluorescence spectroscopy (FL), respectively. Obtained results of the characterization showed that Eu-doping affected structural, optical and magnetic properties of BFO materials. All samples were crystallized in the rhombohedral structure with R3C space group with crystal lattice parameters of a = 5.585 Å, c = 13.832 Å and the average crystal size of LXRD = 581 Å for BFO materials whereas the a, c and LXRD of Eu-doped samples decrease with the increasing of Eu3+ concentration. The analysis result of Raman scattering spectroscopy showed that the position of the characteristic peak for Bi-O covalent bonds shifts toward higher frequency when Eu3+ concentration increases, confirming the dopping substitution of Eu3+ ions into Bi-sites. Fluorescence spectra showed the enhancement of characteristic emission peaks with the increase of Eu concentration. All samples exhibited weak ferromagnetic behaviour with saturation magnetization of Ms = 0.006 emu/g and remnant magnetization of Mr = 0.004 emu/g for BFO materials. The value of Ms and Mr of Eu-doped BFO increases compared to those of undoped-BFO. The origin of ferromagnetism and fluorescence improvement has been discussed.
Keywords:
Fluorescence, ferromagnetic, Eu-doped, X-ray, Raman.
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[20] D. V. Thang, N. V. Quang, N. M. Hung, L. T. M. Oanh, N. C. Khang, B. D. Tu, D. T. X. Thao, N. V. Minh, Structural, Optical, Ferroelectric and Ferromagnetic Properties of Bi1−xGdxFeO3 Materials, Journal of Electronic Materials, Vol. 49, No. 7, 2020, pp. 4443-4449, https://doi.org/10.1007/s11664-020-08158-y.
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