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<p>Ni<sub>0</sub><sub>.2</sub>Mg<sub>0.1</sub>Co<sub>0.7</sub>Fe<sub>2-2x</sub>Al<sub>x</sub>La<sub>x</sub>O<sub>4</sub> was prepared by sol–gel spontaneous combustion method (0.00 ≤ x ≤ 0.2; step size 0.05) ferrite sample. The sample has a cubic spinel structure and no additional impurity phase is generated. The average grain size of the sample is in the range of 52.56 ~ 75.83&#xa0;nm. The lattice constant decreases with the increase of the doping degree. The cationic distribution proves the ion occupancy and the change of bond angle within the sample. The FTIR diagram confirmed the spinel structure of the sample. It can be observed from SEM images that the morphology of the nanoparticles is uniformly distributed, and the samples are agglomerated due to the magnetic effect and high sintering temperature. EDS results showed that the reaction was complete and there were no other impurities in the final product. According to VSM analysis, the sample is ferromagnetic. The magnetization value decreased with the increase of doping amount. The coercivity is affected by crystal anisotropy and grain size. The coercivity (527.81Oe) and magnetization (Mr = 25.55&#xa0;emu/g, Ms = 52.52&#xa0;emu/g) of the sample are the largest when the doping amount is 0.05. The sample can be used in the field of magnetic recording materials and metal smelting.</p>

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Effect of Al and La Co-doping on the Structure and Magnetic Properties of Ni-Mg-Co Ferrite

  • 期刊论文

  • 发表日期：

    2025年7月4日

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  • Jinyuan Ma,
  • Xiaoyan Huang,
  • Ying Jiang,
  • Long Zheng,
  • Aimin Sun

摘要

Ni0.2Mg0.1Co0.7Fe2-2xAlxLaxO4 was prepared by sol–gel spontaneous combustion method (0.00 ≤ x ≤ 0.2; step size 0.05) ferrite sample. The sample has a cubic spinel structure and no additional impurity phase is generated. The average grain size of the sample is in the range of 52.56 ~ 75.83 nm. The lattice constant decreases with the increase of the doping degree. The cationic distribution proves the ion occupancy and the change of bond angle within the sample. The FTIR diagram confirmed the spinel structure of the sample. It can be observed from SEM images that the morphology of the nanoparticles is uniformly distributed, and the samples are agglomerated due to the magnetic effect and high sintering temperature. EDS results showed that the reaction was complete and there were no other impurities in the final product. According to VSM analysis, the sample is ferromagnetic. The magnetization value decreased with the increase of doping amount. The coercivity is affected by crystal anisotropy and grain size. The coercivity (527.81Oe) and magnetization (Mr = 25.55 emu/g, Ms = 52.52 emu/g) of the sample are the largest when the doping amount is 0.05. The sample can be used in the field of magnetic recording materials and metal smelting.