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Mössbauer spectroscopy study of nanosized spinel CoFe2O4 ferrite obtained during coprecipitation followed by mechanochemical treatment

Z. Ž. LAZAREVIĆ1,* , A. MILUTINOVIĆ1, A. UMIĆEVIĆ2, V. N. IVANOVSKI2, V. KOTESKI2, Lj. ANDJELKOVIĆ3, N. ROMČEVIĆ1

Affiliation

  1. Institute of Physics Belgrade, University of Belgrade, 11080, Belgrade, Serbia
  2. Department of Nuclear and Plasma Physics, Vinča Institute of Nuclear Sciences – National Institute of the Republic of Serbia, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia
  3. University of Belgrade, Institute of Chemistry, Technology and Metallurgy, Department of Chemistry, 11000 Belgrade, Serbia

Abstract

The powdery cobalt ferrite (CoFe2O4) is prepared by coprecipitation followed by mechanochemical synthesis in a planetary ball mill. Obtained nanomaterial has been studied using a variety of characterization techniques: X-ray diffraction (XRD), Raman spectroscopy, far infrared (FIR) reflectivity and attenuated total reflectance (ATR) in combination with Fouriertransform infrared (FTIR) spectroscopy in mid IR spectra. The investigated CoFe2O4 nanomaterial showed a typical XRD pattern of cubic spinel. In the Raman and IR spectra are observed all of first-order Raman and IR active modes. Weak subbands activated by structure disorder are seen also. Since nano-CoFe2O4 is macroscopically cubic, its main Raman and IR modes are assigned as in normal cubic spinel. Raman spectrum is fitted with 8 Lorentzian peaks. It is observed that the value of x  0.58 obtained from Raman spectrum, is in good agreement with the value obtained by XRD-structural analysis (0.51). To analyze the IR spectra, we used Decoupled Plasmon - Phonon (DPP) model of the complex dielectric function. Measurement of magnetization in the range of magnetic fields H>>Hc enable the calculation of the anisotropy coefficient K1 = 4.02·105 J cm-3 , which is very high in cobalt ferrite. The 57Fe-Mössbauer spectrum of the CoFe2O4 sample was measured at room temperature in ± 12 mm s-1 Doppler velocity range. The 57Fe-Mössbauer spectrum of the CoFe2O4 sample was fitted with the extended Voigt-based fitting method.

Keywords

CoFe2O4 , Nanoparticles, Mössbauer spectroscopy.

Citation

Z. Ž. LAZAREVIĆ, A. MILUTINOVIĆ, A. UMIĆEVIĆ, V. N. IVANOVSKI, V. KOTESKI, Lj. ANDJELKOVIĆ, N. ROMČEVIĆ, Mössbauer spectroscopy study of nanosized spinel CoFe2O4 ferrite obtained during coprecipitation followed by mechanochemical treatment, Optoelectronics and Advanced Materials - Rapid Communications, 18, 5-6, May-June 2024, pp.289-295 (2024).

Submitted at: Oct. 6, 2023

Accepted at: June 5, 2024