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Abstract <p>The synthesis of Zn<sub>0.3</sub>Ni<sub>0.7–<i>x</i></sub>Co<sub><i>x</i></sub>Fe<sub>2</sub>O<sub>4</sub> ferrites, where <i>x</i>&#xa0;=&#xa0;0&#xa0;–&#xa0;0.7, is presented along with the results of studying their structures and microwave properties. These results show that cobalt substitution for nickel increases the unit cell parameter of the crystal lattice. The magnetic permittivity spectra contains two resonance peaks: low-frequency (1.31-2.04&#xa0;GHz) related to the motion of domain boundaries and high-frequency (4.78-12.05&#xa0;GHz) corresponding to the natural ferromagnetic resonance. An increase in the cobalt concentration shifts both resonances to higher frequencies. The Curie temperature of ferrites monotonically decreases as the cobalt concentration increases.</p>

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Synthesis, Structures, and Microwave Properties of Zn0.3Ni0.7–xCoxFe2O4 Ferrites

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • D. P. Sherstyuk,
  • V. E. Zhivulin,
  • P. A. Zezyulina,
  • D. A. Petrov,
  • A. O. Shiryaev,
  • N. V. Nikolaizin,
  • S. A. Gudkova,
  • D. A. Vinnik

摘要

Abstract

The synthesis of Zn0.3Ni0.7–xCoxFe2O4 ferrites, where x = 0 – 0.7, is presented along with the results of studying their structures and microwave properties. These results show that cobalt substitution for nickel increases the unit cell parameter of the crystal lattice. The magnetic permittivity spectra contains two resonance peaks: low-frequency (1.31-2.04 GHz) related to the motion of domain boundaries and high-frequency (4.78-12.05 GHz) corresponding to the natural ferromagnetic resonance. An increase in the cobalt concentration shifts both resonances to higher frequencies. The Curie temperature of ferrites monotonically decreases as the cobalt concentration increases.