Washing effect on the structural and magnetic properties of NiFe2O4 nanoparticles synthesized by chemical sol-gel method

J. Mantilla, L. León Félix, M. A. Rodriguez, F. H. Aragon, P. C. Morais, J. A.H. Coaquira, E. Kuzmann, A. C. de Oliveira, I. Gonzalez, W. A.A. Macedo, V. K. Garg

Research output: Contribution to journalArticle

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Abstract

NiFe2O4 nanocrystalline samples were synthesized by the sol-gel method. The X-ray diffraction patterns of the as-synthesized samples (S- NiFe2O4) showed the formation of main spinel ferrite structure, with an average crystalline size of ∼50 nm. After a washing process with magnetic separation two sets of NiFe2O4 particles was observed, one with ∼36 nm and other with very small size (∼2–3 nm). X-ray photoelectron spectroscopy (XPS) indicated the presence of Fe3+ and Ni2+ ions on the sample surface. Mössbauer spectra were recorded at 77 K and room temperature and were least square fitted for two sextets which have been assigned to the iron ions occupying the two symmetry sites of the ferrite structure. Magnetic measurements are consistent with the magnetic moment of Ni2+ ions suggesting the formation of an ideal inverse spinel structure in the sample S-NiFe2O4. Moreover, after the washing process with magnetic separation (sample P- NiFe2O4), when the formation of extremely small particles was determined, the Mössbauer and magnetic measurements indicated the reorganization of Ni2+/Fe3+ ions in the tetragonal and octahedral sites of the spinel structure and some features related to thermal relaxations of the small particles are determined.

Original languageEnglish
Pages (from-to)295-304
Number of pages10
JournalMaterials Chemistry and Physics
Volume213
DOIs
Publication statusPublished - Jul 1 2018

Fingerprint

washing
Washing
Sol-gel process
Structural properties
Magnetic properties
gels
Nanoparticles
magnetic properties
nanoparticles
Magnetic separation
Ions
Magnetic variables measurement
spinel
Ferrite
magnetic measurement
ferrites
ions
Magnetic moments
Diffraction patterns
X ray photoelectron spectroscopy

Keywords

  • Magnetization
  • Mössbauer spectroscopy
  • Nickel ferrite nanoparticle
  • Sol-gel polymerization method
  • XPS-Spectroscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Mantilla, J., Félix, L. L., Rodriguez, M. A., Aragon, F. H., Morais, P. C., Coaquira, J. A. H., ... Garg, V. K. (2018). Washing effect on the structural and magnetic properties of NiFe2O4 nanoparticles synthesized by chemical sol-gel method. Materials Chemistry and Physics, 213, 295-304. https://doi.org/10.1016/j.matchemphys.2018.04.022

Washing effect on the structural and magnetic properties of NiFe2O4 nanoparticles synthesized by chemical sol-gel method. / Mantilla, J.; Félix, L. León; Rodriguez, M. A.; Aragon, F. H.; Morais, P. C.; Coaquira, J. A.H.; Kuzmann, E.; de Oliveira, A. C.; Gonzalez, I.; Macedo, W. A.A.; Garg, V. K.

In: Materials Chemistry and Physics, Vol. 213, 01.07.2018, p. 295-304.

Research output: Contribution to journalArticle

Mantilla, J, Félix, LL, Rodriguez, MA, Aragon, FH, Morais, PC, Coaquira, JAH, Kuzmann, E, de Oliveira, AC, Gonzalez, I, Macedo, WAA & Garg, VK 2018, 'Washing effect on the structural and magnetic properties of NiFe2O4 nanoparticles synthesized by chemical sol-gel method', Materials Chemistry and Physics, vol. 213, pp. 295-304. https://doi.org/10.1016/j.matchemphys.2018.04.022
Mantilla, J. ; Félix, L. León ; Rodriguez, M. A. ; Aragon, F. H. ; Morais, P. C. ; Coaquira, J. A.H. ; Kuzmann, E. ; de Oliveira, A. C. ; Gonzalez, I. ; Macedo, W. A.A. ; Garg, V. K. / Washing effect on the structural and magnetic properties of NiFe2O4 nanoparticles synthesized by chemical sol-gel method. In: Materials Chemistry and Physics. 2018 ; Vol. 213. pp. 295-304.
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abstract = "NiFe2O4 nanocrystalline samples were synthesized by the sol-gel method. The X-ray diffraction patterns of the as-synthesized samples (S- NiFe2O4) showed the formation of main spinel ferrite structure, with an average crystalline size of ∼50 nm. After a washing process with magnetic separation two sets of NiFe2O4 particles was observed, one with ∼36 nm and other with very small size (∼2–3 nm). X-ray photoelectron spectroscopy (XPS) indicated the presence of Fe3+ and Ni2+ ions on the sample surface. M{\"o}ssbauer spectra were recorded at 77 K and room temperature and were least square fitted for two sextets which have been assigned to the iron ions occupying the two symmetry sites of the ferrite structure. Magnetic measurements are consistent with the magnetic moment of Ni2+ ions suggesting the formation of an ideal inverse spinel structure in the sample S-NiFe2O4. Moreover, after the washing process with magnetic separation (sample P- NiFe2O4), when the formation of extremely small particles was determined, the M{\"o}ssbauer and magnetic measurements indicated the reorganization of Ni2+/Fe3+ ions in the tetragonal and octahedral sites of the spinel structure and some features related to thermal relaxations of the small particles are determined.",
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AU - Mantilla, J.

AU - Félix, L. León

AU - Rodriguez, M. A.

AU - Aragon, F. H.

AU - Morais, P. C.

AU - Coaquira, J. A.H.

AU - Kuzmann, E.

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AU - Gonzalez, I.

AU - Macedo, W. A.A.

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AB - NiFe2O4 nanocrystalline samples were synthesized by the sol-gel method. The X-ray diffraction patterns of the as-synthesized samples (S- NiFe2O4) showed the formation of main spinel ferrite structure, with an average crystalline size of ∼50 nm. After a washing process with magnetic separation two sets of NiFe2O4 particles was observed, one with ∼36 nm and other with very small size (∼2–3 nm). X-ray photoelectron spectroscopy (XPS) indicated the presence of Fe3+ and Ni2+ ions on the sample surface. Mössbauer spectra were recorded at 77 K and room temperature and were least square fitted for two sextets which have been assigned to the iron ions occupying the two symmetry sites of the ferrite structure. Magnetic measurements are consistent with the magnetic moment of Ni2+ ions suggesting the formation of an ideal inverse spinel structure in the sample S-NiFe2O4. Moreover, after the washing process with magnetic separation (sample P- NiFe2O4), when the formation of extremely small particles was determined, the Mössbauer and magnetic measurements indicated the reorganization of Ni2+/Fe3+ ions in the tetragonal and octahedral sites of the spinel structure and some features related to thermal relaxations of the small particles are determined.

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