Influence of Na substitution on structural, magnetic, optical and photocatalytic properties of bismuth ferrite nanoparti
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Influence of Na substitution on structural, magnetic, optical and photocatalytic properties of bismuth ferrite nanoparticles Sunil Chauhan1,2,* , Chief Anand1, Babita Tripathi1, Manoj Kumar3,*, Mohit Sahni1, R. C. Singh1, and Satyendra Singh2,* 1
Department of Physics, School of Basic Sciences and Research, Sharda University, Greater Noida 201310, India Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi 110067, India 3 Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Noida, U.P. 201309, India 2
Received: 22 July 2020
ABSTRACT
Accepted: 22 September 2020
We have reported the influence of Na substitution on structural, magnetic, optical and photocatalytic properties of sol–gel route synthesized Bi1-xNaxFeO3 (x = 0.0, 0.02, 0.04, 0.06 and 0.08) nanoparticles. Rietveld refinement of the XRD data and electron microscopy techniques revealed the phase purity and nanocrystalline nature of Bi1-xNaxFeO3 samples. The substitution of Na1? leads to the structural distortion in BiFeO3 nanoparticles which is apparent from the XRD Rietveld refinement and Raman spectroscopy studies. The ferromagnetic ordering parameters increase with increasing Na content in BiFeO3 nanoparticles and the highest magnetization 0.91 emu/g at 30kOe is observed for x = 0.08 sample. The observed enhanced ferromagnetic behaviour of Bi1-xNaxFeO3 nanoparticles are also endorsed by the ESR analysis. The energy bandgap of BiFeO3 nanoparticles is altered by aliovalent Na ions substitution from 2.16 to 2.03 eV. Compared to pristine BiFeO3, the Na-substituted BiFeO3 nanoparticles revealed the much-advanced photocatalytic activity of methylene blue (MB) and crystal violet (CV) under UV–visible light irradiation. In the irradiation time of 100 min, Bi0.96Na0.04FeO3 nanoparticles showed * 95% MB and * 84% CV degradation. The outstanding changes in the magnetic and photocatalytic properties of Bi1-xNaxFeO3 nanoparticles are due to the differences in the ionic radii, aliovalency between the Bi3? and Na1? ions and oxygen vacancies.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
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https://doi.org/10.1007/s10854-020-04540-y
J Mater Sci: Mater Electron
1 Introduction BiFeO3 is one of the most candid multiferroic at room temperature with distorted rhombohedral perovskite structure which combines antiferromagnetism and ferroelectricity in the same phase. It is an appropriate candidate to serve in various application purposes in several fields such as the self-powered UV–visible detectors, resistive switching, Nonlinear Imaging of bio species and photo-induced cell damage, microwave absorption, degradation of several organic dyes by magnetoelectric driven catalysis, Piezo-electrochemical mechanocatalysis and photocatalysis [1–6]. Regardless of different fascinating features, multiferroic BiFeO3 materials have many limitations like difficult to synthesize in single p
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