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Tailoring of structural, dielectric, and magnetic properties of SrBaCu2Fe12O22 hexaferrites by doping with Gd–Co binary mixtures

Malik, H ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1007/s00339-022-05861-x
  3. Publisher: Springer Science and Business Media Deutschland GmbH , 2022
  4. Abstract:
  5. Gadolinium (Gd) and cobalt (Co) substituted Sr–Ba–Cu-based Y-type hexaferrites were synthesized with the help of the sol–gel auto-combustion route. XRD (X-ray diffraction) analysis was done to ratify the phase formation of hexaferrites. The impact of Gd3+ substitutions was measured on all the lattice parameters. Lattice constants “a” and “c” were found between 5.879–5.891 Å and 43.185–43.620 Å, respectively. It was observed from the XRD analysis that with an increase in Gd–Co contents, the enhancement in the average crystallite size is noted. The thermal decomposition process was studied using TGA (thermogravimetric analysis), revealing that the precursor may give the ending product when annealed over 850 °C. Various absorption bands were observed in the range of 350 to 1800 cm−1 by plotting the FTIR spectroscopic results of Gd–Co-substituted SrBaCu2Fe12O22 ferrites. The tetrahedral and octahedral sites indicated absorption bands via Fourier transform infrared spectroscopy (FTIR) spectra. An impedance analyzer was employed to explore the dielectric trend and AC conductivity of prepared nano hexaferrites. All prepared samples indicated dielectric dispersion, the usual dielectric behavior showing Maxwell–Wagner-type interfacial polarization. A decrease in dielectric constant and dielectric loss was found when the frequency was enhanced. Gd inclusion enhanced AC conductivity. Complex impedance analysis revealed semi-circles. With the enhancement in Gd–Co substitution the decrement in saturation magnetization (Ms) from 37.84 emu/g to 25.39 emu/g was observed, the rise of remanence (Mr) from 12.80 emu/g to 19.56 emu/g, and coercivity (Hc) from 1226.77 Oe to 5158.57 Oe was found. Therefore, the synthesized Sr–Ba–Cu-based Y-type hexagonal ferrites with the appropriate amount of Gd–Co substitution are suitable candidates for permanent magnetic materials and recording media. © 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature
  6. Keywords:
  7. Ac conductivity ; FTIR ; Gd-substituted Y-type hexaferrites ; TGA ; XRD ; Absorption spectroscopy ; Barium compounds ; Cobalt compounds ; Copper compounds ; Crystallite size ; Decomposition ; Dielectric devices ; Dielectric losses ; Dielectric materials ; Ferrite ; Ferrites ; Iron compounds ; Lattice constants ; Saturation magnetization ; Spectrum analysis ; Thermogravimetric analysis ; X ray diffraction analysis ; A.c. conductivity ; Ac Conductivity ; Cu-based ; Gadolinia ; Gadolinia-substituted Y-type hexaferrite ; Hexaferrites ; Hysteresis behavior ; Synthesised ; X- ray diffractions ; Fourier transform infrared spectroscopy ; A.C conductivity
  8. Source: Applied Physics A: Materials Science and Processing ; Volume 128, Issue 9 , 2022 ; 09478396 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s00339-022-05861-x