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<p>CoZr<sub>x</sub>Hf<sub>y</sub>Fe<sub>(2-x-y)</sub>O<sub>4</sub> nanoparticles were synthesized using the co-precipitation method with doping concentrations (x = y = 0, 0.02, 0.04). The crystal structure was confirmed through X-ray diffraction (XRD) analysis, supported by Rietveld refinement, revealing a pure spinel phase (Fd-3m space group) with crystallite sizes ranging from 40 to 54 nm. Fourier Transform Infrared Spectroscopy (FTIR) further confirmed the spinel structure. Transmission Electron Microscopy (TEM) and Energy-Dispersive X-ray Spectroscopy (EDS) revealed spherical nanoparticles with uniform morphology and composition. X-ray Photoelectron Spectroscopy (XPS) was employed to analyze the oxidation states of ions and identify the presence of oxygen vacancies. Magnetic measurements, including coercivity (H<sub>C</sub>), saturation magnetization (M<sub>S</sub>), and remanent magnetization (Mr), showed a decrease in H<sub>C</sub> from 630.51 Oe (x = y = 0.00) to 227.20 Oe (x = y = 0.04), a reduction in MS from 80.74 to 73.97 emu/g, and a decrease in Mr from 26.94 to 18.42 emu/g with increasing doping concentration. These results highlight the tunable magnetic properties of the nanoparticles, making them promising candidates for applications in magnetic data storage, targeted drug delivery, and biomedical imaging.</p>

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Impact of Zr and Hf doping on the structural and magnetic properties of CoFe2O4 nanoparticles

  • 期刊论文

  • 发表日期：

    2025年6月25日

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  • Y. Ait el haj,
  • M. Elansary,
  • K. Minaoui,
  • M. Ibeniaich,
  • M. Belaiche,
  • Y. Mouhib,
  • E. Iffer,
  • O. M. Lemine,
  • B. Salameh,
  • A. M. Alsmadi

摘要

CoZrxHfyFe(2-x-y)O4 nanoparticles were synthesized using the co-precipitation method with doping concentrations (x = y = 0, 0.02, 0.04). The crystal structure was confirmed through X-ray diffraction (XRD) analysis, supported by Rietveld refinement, revealing a pure spinel phase (Fd-3m space group) with crystallite sizes ranging from 40 to 54 nm. Fourier Transform Infrared Spectroscopy (FTIR) further confirmed the spinel structure. Transmission Electron Microscopy (TEM) and Energy-Dispersive X-ray Spectroscopy (EDS) revealed spherical nanoparticles with uniform morphology and composition. X-ray Photoelectron Spectroscopy (XPS) was employed to analyze the oxidation states of ions and identify the presence of oxygen vacancies. Magnetic measurements, including coercivity (HC), saturation magnetization (MS), and remanent magnetization (Mr), showed a decrease in HC from 630.51 Oe (x = y = 0.00) to 227.20 Oe (x = y = 0.04), a reduction in MS from 80.74 to 73.97 emu/g, and a decrease in Mr from 26.94 to 18.42 emu/g with increasing doping concentration. These results highlight the tunable magnetic properties of the nanoparticles, making them promising candidates for applications in magnetic data storage, targeted drug delivery, and biomedical imaging.