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Anomalous magnetic behaviour at nano-scale of Mn2+-substituted magnesio-ferrite synthesized by auto-combustion technique

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Abstract

The nano-crystalline mixed ferrites with the generic formula MnxMg1 − xFe2O4 (x = 0.0–1.0, step: 0.2) were prepared by the citrate-gel auto-combustion technique. Motivated by anomalous magnetic behaviour of coarse-grained MnFe2O4, the main aim was to study the influence of Mn2+ substitution in MgFe2O4 on magnetic structure at nano-regime. The compositional stoichiometry of the final ferrite products was ascertained by EDAX mapping and particle size for each sample was determined by powder X-ray diffraction, TEM, small-angle X-ray and neutron scattering techniques. The lattice constant increases with Mn-content due to larger cation (Mn2+) substitution. The distribution of cations in the tetrahedral (A) and octahedral (B) interstitial sites of the spinel lattice is determined by X-ray diffraction and Mossbauer spectral intensity analysis. The Mossbauer spectra at room temperature exhibit two sextets due to A- and B-sites for compositions x = 0.0, 0.2 and 1.0 while spectra showed central paramagnetic doublet superimposed on magnetic sextets for the samples with x = 0.4, 0.6 and 0.8, ascribed to the presence of superparamagnetic clusters. Thermal variation of AC susceptibility showed hump near the Curie temperature due to the presence of superparamagnetic clusters as corroborated by Mossbauer signature. The observed saturation magnetic moment (at temperature 5 K and applied field 9 T) is found lower compared to Neel's moment for the compositions with x > 0.2 which is explained on the basis of the exchange disorder of Fe3+ ions in the B-sites in Mn-containing ferrites.

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Acknowledgements

The authors are thankful to Prof. V M S Verenkar, Goa University, Goa for extending the AC susceptibility measurement facility. The authors are also thankful to Dr. P D Babu, UGC-DAE-CSR, BARC, Mumbai for providing M-H loop measurement facility. One of the authors (LJH) is thankful to University Grants Commission, New Delhi for providing a research fellowship.

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Authors and Affiliations

  1. Department of Physics, Saurashtra University, Rajkot, Gujarat, 360005, India

    Laxmi J. Hathiya, J. D. Baraliya & H. H. Joshi

  2. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra, 400085, India

    Avik Das & Debasis Sen

  3. Homi Bhabha National Institute, Anushaktinagar, Mumbai, Maharashtra, 400094, India

    Avik Das & Debasis Sen

  4. Department of Physics, College of Science, Sultan Qaboos University, Code 123, P.O. Box 36, Al-khoud, Oman

    A. M. Gismelseed & A. A. Yousif

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  1. Laxmi J. Hathiya
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  2. J. D. Baraliya
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Correspondence to Laxmi J. Hathiya.

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Hathiya, L.J., Baraliya, J.D., Das, A. et al. Anomalous magnetic behaviour at nano-scale of Mn2+-substituted magnesio-ferrite synthesized by auto-combustion technique. Indian J Phys 96, 2323–2335 (2022). https://doi.org/10.1007/s12648-021-02169-z

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