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<p>This is the study of CoFe<sub>2</sub>O<sub>4</sub> and CoAl<sub>0.2</sub>Fe<sub>1.8</sub>O<sub>4</sub> ferrite nanoparticles synthesized by sol–gel method, and their structural and magnetic properties with aluminum doping are studied here. Metal nitrates of high purity were used as chelating and polymerization agents along with citric acid and ethylene glycol for the synthesis. The insertion of Al<sup>3+</sup> ions into the structure was confirmed by XRD in the present study, where values of lattice parameters decreased and crystallite size decreased. The FT-IR result indicated the same that the Al<sup>3+</sup> ions sample has the better metal–oxygen bond. The SEM–EDS results indicated that the addition of Al<sup>3+</sup> resulted in finer particles relative to the undoped sample. Saturation magnetization, Ms, was reduced from 80&#xa0;emu/g to 70&#xa0;emu/g; Hc was decreased to 650 Oe to 500 Oe; and the anisotropy constant K1 was decreased to 1.2 × 10<sup>6</sup> erg/cm<sup>3</sup> to 9.5 × 10<sup>5</sup> erg/cm<sup>3</sup> from VSM result confirming the lower magnetic hardness due to the Al<sup>3+</sup> doping. Based on the study results, it is clear that the dope of the Al<sup>3+</sup> donor has a dramatic effect on the properties of ferrite nanoparticles.</p>

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Effect of Al3+ Doping on the Microstructure and Magnetic Behavior of CoFe2O4 Nanoparticles

  • 期刊论文

  • 发表日期：

    2025年1月24日

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  • Vaibhav K. Kashte,
  • Vishal Ashok Pandit,
  • Nilkanth N. Kapse,
  • Dinesh Rathod,
  • Bhagwan G. Toksha

摘要

This is the study of CoFe2O4 and CoAl0.2Fe1.8O4 ferrite nanoparticles synthesized by sol–gel method, and their structural and magnetic properties with aluminum doping are studied here. Metal nitrates of high purity were used as chelating and polymerization agents along with citric acid and ethylene glycol for the synthesis. The insertion of Al3+ ions into the structure was confirmed by XRD in the present study, where values of lattice parameters decreased and crystallite size decreased. The FT-IR result indicated the same that the Al3+ ions sample has the better metal–oxygen bond. The SEM–EDS results indicated that the addition of Al3+ resulted in finer particles relative to the undoped sample. Saturation magnetization, Ms, was reduced from 80 emu/g to 70 emu/g; Hc was decreased to 650 Oe to 500 Oe; and the anisotropy constant K1 was decreased to 1.2 × 106 erg/cm3 to 9.5 × 105 erg/cm3 from VSM result confirming the lower magnetic hardness due to the Al3+ doping. Based on the study results, it is clear that the dope of the Al3+ donor has a dramatic effect on the properties of ferrite nanoparticles.