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Abstract <p>Co<sub><i>x</i></sub>Fe<sub>3–<i>x</i></sub>O<sub>4</sub> (<i>x</i> = 0.0, 0.5, and 1.0) single-phase microcrystalline samples are obtained by mechanochemical synthesis. They are studied comprehensively by X-ray structural analysis, vibration magnetometry, Mössbauer spectroscopy, and neutron diffraction. The crystal-chemical formulas are established, and the magnetic properties of the compounds are characterized. The Co<sub><i>x</i></sub>Fe<sub>3–<i>x</i></sub>O<sub>4</sub> (<i>x</i> = 0.0, 0.5, and 1.0) nanoparticles are obtained by wet high-energy milling of the single-phase microcrystalline samples. It is shown that the average size of the synthesized nanoparticles is from 11 to 13 nm. There is a decrease in the coercive force for all Co<sub><i>x</i></sub>Fe<sub>3–<i>x</i></sub>O<sub>4</sub> nanocrystalline samples compared to their microcrystalline analogs, which is due to there being a large proportion of nanoparticles in the superparamagnetic state. The specific power loss values calculated from hyperthermia effect measurements appear to be maximum (3.5 W g<sup>–1</sup>) for the Fe<sub>3</sub>O<sub>4</sub> sample (<i>x</i>&#xa0;=&#xa0;0.0), which is explained primarily by the ratio of its coercive force and the amplitude of the applied alternating field strength.</p>

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Structure, Magnetic Properties, and Hyperthermia of CoxFe3–xO4 Nanoparticles Prepared by the High-Energy Ball Milling Method

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • A. D. Kovalev,
  • P. I. Nikolenko,
  • T. R. Nizamov,
  • A. I. Novikov,
  • M. A. Abakumov,
  • M. A. Semkin,
  • P. A. Borisova,
  • S. S. Agafonov,
  • V. V. Popov,
  • I. V. Shchetinin

摘要

Abstract

CoxFe3–xO4 (x = 0.0, 0.5, and 1.0) single-phase microcrystalline samples are obtained by mechanochemical synthesis. They are studied comprehensively by X-ray structural analysis, vibration magnetometry, Mössbauer spectroscopy, and neutron diffraction. The crystal-chemical formulas are established, and the magnetic properties of the compounds are characterized. The CoxFe3–xO4 (x = 0.0, 0.5, and 1.0) nanoparticles are obtained by wet high-energy milling of the single-phase microcrystalline samples. It is shown that the average size of the synthesized nanoparticles is from 11 to 13 nm. There is a decrease in the coercive force for all CoxFe3–xO4 nanocrystalline samples compared to their microcrystalline analogs, which is due to there being a large proportion of nanoparticles in the superparamagnetic state. The specific power loss values calculated from hyperthermia effect measurements appear to be maximum (3.5 W g–1) for the Fe3O4 sample (x = 0.0), which is explained primarily by the ratio of its coercive force and the amplitude of the applied alternating field strength.