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Magnetic, structural and cation distribution studies on \(\mathrm{FeO}\cdot\mathrm{Fe}_{(2-x)}\mathrm{Nd}_{x} \mathrm{O_{3}}\) (x = 0.00, 0.02, 0.04, 0.06 and 0.1) nanoparticles

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Abstract.

We synthesized and characterized the colloidal suspensions of \(\mathrm{FeO}\cdot\mathrm{Fe}_{(2-x)}\mathrm{Nd}_{x} \mathrm{O_{3}}\) nanoparticles with x = 0.00, 0.02, 0.04, 0.06 and 0.1. The effect of the Fe3+ ion replacement by Nd3+ on the crystal structure is in-depth studied. The samples were characterized by the following techniques: X-ray diffraction (XRD), UV-Vis spectrophotometry, transmission electronic microscopy (TEM), small-angle X-ray scattering (SAXS), magnetization as a function of applied magnetic field (M-H loops) and magnetization as a function of temperature in zero-field-cooled and field-cooled regimes (ZFC-FC). From XRD cation distribution, structural parameters were extracted. The increasing in the bandgap is interpreted as a result of the higher interatomic separation with the doping. TEM micrographs reveal a polydisperse size and shape distribution of particles. The results for the volume-weighted average diameter measured by SAXS are consistent with those determined by XRD. From the M-H loops we found that the superparamagnetic (SPM) regime contributes with 95-97% for all samples, while only 3-5% contribution comes from the paramagnetic (PM) regime. The saturation magnetization increases in a steady manner upon increasing the Nd3+ ion molar ratio from 0.00 up to 0.06, reaching the maximum value of 105.8±0.4 Am2/kg at x = 0.06. It is worth to mention that the result for the saturation magnetization value are higher than that of the bulk material.

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Authors and Affiliations

  1. Institute of Physics, University of São Paulo, Rua do Matão 1371, 05508-090, São Paulo, SP, Brazil

    W. W. R. Araujo, C. L. P. Oliveira, G. E. S. Brito & A. M. Figueiredo Neto

  2. Department of Physics, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil

    J. F. D. F. Araujo

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  1. W. W. R. Araujo
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  2. J. F. D. F. Araujo
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  3. C. L. P. Oliveira
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  4. G. E. S. Brito
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Araujo, W.W.R., Araujo, J.F.D.F., Oliveira, C.L.P. et al. Magnetic, structural and cation distribution studies on \(\mathrm{FeO}\cdot\mathrm{Fe}_{(2-x)}\mathrm{Nd}_{x} \mathrm{O_{3}}\) (x = 0.00, 0.02, 0.04, 0.06 and 0.1) nanoparticles. Eur. Phys. J. E 42, 153 (2019). https://doi.org/10.1140/epje/i2019-11917-5

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