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<p>Dysprosium-doped cobalt ferrites with the composite formula CoFe₂₋<sub>x</sub>DyₓO₄ were fabricated employing the solid-state synthesis method. This investigation thoroughly examines the effect of low levels of Dy doping on the structural and magnetic characteristics of cobalt ferrites. X-ray diffraction analysis verified that the compounds display a single-phase cubic spinel structure, with the lattice parameter increasing proportionally to the Dy dopant concentration. Scanning electron microscopy (SEM), Raman spectroscopy, Fourier-transform infrared spectroscopy (FTIR), ultraviolet-diffuse reflectance spectroscopy (UV DRS), and magnetization measurements were utilized to investigate the microstructural, energy gap, and magnetic properties of these ferrite materials. The energy gap decreased from 1.47&#xa0;eV to 1.43&#xa0;eV. The introduction of Dy³⁺ ions into the cobalt ferrite matrix led to a shift in all vibrational modes towards lower frequencies, with the exception of the T<sub>2g</sub> mode, which shifted to higher frequencies, indicating cation redistribution within the spinel structure. The Dy-doped samples demonstrated a decrease in saturation magnetization compared to the undoped cobalt ferrites. A comprehensive examination was undertaken to analyze the changes in magnetic and dielectric characteristics with varying Dy doping concentrations.</p>

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Impact of low Dy doping concentration on structural, and magnetic behaviour of CoFe2O4

  • 期刊论文

  • 发表日期：

    2025年10月23日

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  • G. Sharada,
  • N. Pavan Kumar,
  • G. Shwetha,
  • G. Thirupathi,
  • P. Sowjanya,
  • D. Sreenivasu

摘要

Dysprosium-doped cobalt ferrites with the composite formula CoFe₂₋xDyₓO₄ were fabricated employing the solid-state synthesis method. This investigation thoroughly examines the effect of low levels of Dy doping on the structural and magnetic characteristics of cobalt ferrites. X-ray diffraction analysis verified that the compounds display a single-phase cubic spinel structure, with the lattice parameter increasing proportionally to the Dy dopant concentration. Scanning electron microscopy (SEM), Raman spectroscopy, Fourier-transform infrared spectroscopy (FTIR), ultraviolet-diffuse reflectance spectroscopy (UV DRS), and magnetization measurements were utilized to investigate the microstructural, energy gap, and magnetic properties of these ferrite materials. The energy gap decreased from 1.47 eV to 1.43 eV. The introduction of Dy³⁺ ions into the cobalt ferrite matrix led to a shift in all vibrational modes towards lower frequencies, with the exception of the T2g mode, which shifted to higher frequencies, indicating cation redistribution within the spinel structure. The Dy-doped samples demonstrated a decrease in saturation magnetization compared to the undoped cobalt ferrites. A comprehensive examination was undertaken to analyze the changes in magnetic and dielectric characteristics with varying Dy doping concentrations.