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<p>This work studies the influence of annealing temperature and Co-doping at the Fe-site on the physicochemical characteristics of nanosized perovskite HoFe<sub>1−x</sub>Co<sub>x</sub>O<sub>3</sub> (with theoretical doping levels of x = 0.05, 0.15, and 0.25), synthesized via a simple co-precipitation technique. The substitution of Co at the Fe-site reduces both the average crystallite size and lattice volume. This reduction is attributed to the smaller ionic radius of <sub>27</sub>Co<sup>3+</sup> (0.55&#xa0;Å in low-spin, 0.61&#xa0;Å in high-spin) compared to that of <sub>26</sub>Fe<sup>3+</sup> (0.65&#xa0;Å in high-spin). Co-doping significantly enhances the magnetic properties of HoFe<sub>1−x</sub>Co<sub>x</sub>O<sub>3</sub> by increasing the crystalline anisotropy, leading to improved coercivity (<i>H</i><sub>c</sub>) and remanent magnetization (<i>M</i><sub>r</sub>). Incontrast, higher annealing temperatures improve crystallinity, leading to decreased <i>H</i><sub>c</sub> and <i>M</i><sub>r</sub>. The synthesized HoFe<sub>1−x</sub>Co<sub>x</sub>O<sub>3</sub> nanoparticles exhibit characteristics of hard magnetic materials, displaying higher <i>H</i><sub>c</sub> and <i>M</i><sub>r</sub> compared to similar reported perovskites such as Ni-doped HoFeO<sub>3</sub>, Co-doped NdFeO<sub>3</sub>, Ni/Mn-doped YFeO<sub>3</sub>, and Ni-doped LaFeO<sub>3</sub>. These findings suggest that these HoFe<sub>1−x</sub>Co<sub>x</sub>O<sub>3</sub> nanomaterials possess promising potential for the fabrication of permanent magnets, particularly in magnetic recording applications, such as in hard drives and magnetic tapes. </p>

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Influence of annealing temperature and Co substitution at B-site for Fe3+ ions on the physicochemical characteristics of HoFeO3 perovskite nanoparticles

  • 期刊论文

  • 发表日期：

    2025年6月2日

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  • Nguyen Anh Tien,
  • Elena Viktorovna Tomina,
  • Valentina Olegovna Mittova,
  • Vu Anh Thi Ngoc,
  • Nguyen Van My,
  • Thu Trang Nguyen Thi

摘要

This work studies the influence of annealing temperature and Co-doping at the Fe-site on the physicochemical characteristics of nanosized perovskite HoFe1−xCoxO3 (with theoretical doping levels of x = 0.05, 0.15, and 0.25), synthesized via a simple co-precipitation technique. The substitution of Co at the Fe-site reduces both the average crystallite size and lattice volume. This reduction is attributed to the smaller ionic radius of 27Co3+ (0.55 Å in low-spin, 0.61 Å in high-spin) compared to that of 26Fe3+ (0.65 Å in high-spin). Co-doping significantly enhances the magnetic properties of HoFe1−xCoxO3 by increasing the crystalline anisotropy, leading to improved coercivity (Hc) and remanent magnetization (Mr). Incontrast, higher annealing temperatures improve crystallinity, leading to decreased Hc and Mr. The synthesized HoFe1−xCoxO3 nanoparticles exhibit characteristics of hard magnetic materials, displaying higher Hc and Mr compared to similar reported perovskites such as Ni-doped HoFeO3, Co-doped NdFeO3, Ni/Mn-doped YFeO3, and Ni-doped LaFeO3. These findings suggest that these HoFe1−xCoxO3 nanomaterials possess promising potential for the fabrication of permanent magnets, particularly in magnetic recording applications, such as in hard drives and magnetic tapes.