Effect of Yb/Co co-dopants on surface chemical bonding states of BiFeO3 nanoparticles with promising photocatalytic performance in dye degradation

In this work the nanocrystalline particles of BiFO3 co-doped with ytterbium and cobalt Bi1-xYbxFe1-xCoxO3 (x = 0.0, 0.02, 0.04, 0.06, 0.08) were synthesized via sol-gel method. The phase purity and crystallinity of the synthesized particles were examined by X-ray diffraction (XRD) technique. The val...

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Bibliographic Details
Published in:The Journal of physics and chemistry of solids 2021-05, Vol.152, p.109926, Article 109926
Main Authors: Sahni, Mohit, Mukhopadhyay, Sabyasachi, Mehra, R.M., Chauhan, Sunil, Chandra Sati, Prakash, Kumar, Manish, Singh, Munendra, Kumar, Naresh
Format: Article
Language:English
Subjects:
Doping
Magnetic
Multiferroic
Photocatalytic
Sol-gel
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Summary:In this work the nanocrystalline particles of BiFO3 co-doped with ytterbium and cobalt Bi1-xYbxFe1-xCoxO3 (x = 0.0, 0.02, 0.04, 0.06, 0.08) were synthesized via sol-gel method. The phase purity and crystallinity of the synthesized particles were examined by X-ray diffraction (XRD) technique. The values of the diffraction peaks match precisely with the standard data (JCPDS card no.-71-2494). XRD data also ensures the formation of rhombohedral symmetry of R3C space group. Raman spectra over the frequency range of 800–1600 cm−1 have been systematically investigated with different excitation wavelengths. For determining vibrational modes of the doped nanoparticles, Raman scattering spectra at excitation wavelengths λ = 532 nm was recorded. FESEM images reveal the fact that, x = 0.02 doping significantly reduces the grain size resulting high surface area for active sites.X-ray photoelectron spectroscopy (XPS) was also carried out to estimate the compositions and the valence states of elements in Bi1-xYbxCoxFe1-xO3 (x = 0.04, and 0.06) nanoparticles. The substitution of Yb3+ and Co2+ ions in BFO nanocrystalline samples, improves the magnetic and photocatalytic properties. The entire range of visible light wavelength absorption is observed in all the synthesized nanoparticles and were analysed by UV–Visible absorption spectroscopy. The energy band gap was found to be ~2.30 eV for pure BFO, which get altered by Yb3+ and Co2+ substitution and found to be ~1.88 eV in case of Bi0.94Yb0.06Fe0.94Co0.06O3 nanoparticle. The photocatalytic properties get enhanced with the substitution of Yb3+and Co2+ in BFO, that may be due to change in energy band gap and formation of trapping sight, which results into increase in the number of electron hole pair and hence improve the photocatalytic properties. •The Yb/Co substituted BFO nanoparticles were prepared by Sol-gel Method.•The structural, Magnetic, Optical and Photocatalytic properties were studied.•Rietveld refinement of XRD patterns suggested the distorted rhombohedral structure in Yb/Co substituted BFO samples.•The band gap was observed to be minimum for 6% Yb/Co substitution in BFO.•The samples prepared with 6% Yb/Co substitution in BFO shows better magnetic and Photocatalytic properties.
ISSN:0022-3697
1879-2553
DOI:10.1016/j.jpcs.2020.109926