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Magnetic properties of binary and ternary mixed metal oxides NiFe2O4 and Zn0.5Ni0.5Fe2O4 doped with rare earths by sol—gel synthesis

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Abstract

The spinel-type ferrites NiFe2O4 and Zn0.5Ni0.5Fe2O4 modified by lanthanide ions Eu3+ and Tb3+ were prepared by a sol—gel process with propylene oxide as a gelating agent. The phase homogeneity of the samples was tested by XRD and Mössbauer spectroscopy. Transmission electronic microscopy used for characterisation of the morphology of the samples revealed nanosized powdered samples with a narrow distribution of particle sizes. It was noted that the presence of Ln3+ ions influenced the magnetic properties of nanosized NiFe2O4 and Ni0.5Zn0.5Fe2O4 ferrites. The dependence of the magnetic properties of the samples on the rare-earth doping may be explained by the different grain sizes. The saturation magnetisation tends to decrease with increasing rare-earth doping and decreasing crystallite size. A similar trend was observed for the coercive field, with the exception of the Tb3+-doped Zn0.5Ni0.5Fe2O4 where it remained the same as in the pure ferrite.

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Authors and Affiliations

  1. Department of Inorganic Chemistry, Faculty of Chemistry and Pharmacy, Sofia University “St. Kliment Ohridski”, 1. J. Bourchier, 1164, Sofia, Bulgaria

    Martin Tsvetkov, Maria Milanova & Joana Zaharieva

  2. C2TN, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, km 139,7, 2695-066, Bobadela LRS, Portugal

    Laura C. J. Pereira & Jaão C. Waerenbourgh

  3. Institute of Catalysis, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Block 11, 1113, Sofia, Bulgaria

    Zara Cherkezova-Zheleva & Ivan Mitov

Authors
  1. Martin Tsvetkov
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  2. Maria Milanova
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  3. Laura C. J. Pereira
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  4. Jaão C. Waerenbourgh
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  5. Zara Cherkezova-Zheleva
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Correspondence to Maria Milanova or Laura C. J. Pereira.

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Tsvetkov, M., Milanova, M., Pereira, L.C.J. et al. Magnetic properties of binary and ternary mixed metal oxides NiFe2O4 and Zn0.5Ni0.5Fe2O4 doped with rare earths by sol—gel synthesis. Chem. Pap. 70, 1600–1610 (2016). https://doi.org/10.1515/chempap-2016-0097

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  • DOI: https://doi.org/10.1515/chempap-2016-0097

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