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<p>Spinel ferrites with tunable magnetic and dielectric characteristics have attracted considerable attention for applications in high-frequency devices, electromagnetic shielding, microwave absorption, sensors, and energy storage systems. This study explores the impact of Cr<sup>3</sup>⁺ ions doping on the structural, magnetic, and dielectric behaviour of <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({Co}_{0.25}{Cu}_{0.25}{Zn}_{0.5}{Fe}_{2-x}{Cr}_{x}{O}_{4}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mrow> <mi mathvariant="italic">Co</mi> </mrow> <mrow> <mn>0.25</mn> </mrow> </msub> <msub> <mrow> <mi mathvariant="italic">Cu</mi> </mrow> <mrow> <mn>0.25</mn> </mrow> </msub> <msub> <mrow> <mi mathvariant="italic">Zn</mi> </mrow> <mrow> <mn>0.5</mn> </mrow> </msub> <msub> <mrow> <mi mathvariant="italic">Fe</mi> </mrow> <mrow> <mn>2</mn> <mo>-</mo> <mi>x</mi> </mrow> </msub> <msub> <mrow> <mi mathvariant="italic">Cr</mi> </mrow> <mi>x</mi> </msub> <msub> <mi>O</mi> <mn>4</mn> </msub> </mrow> </math></EquationSource> </InlineEquation> (pure CCZ and Cr-CCZ samples) spinel ferrites (SFs). The as-prepared SFs were prepared via the self-ignition process, with varying doping of Cr<sup>3</sup>⁺ (0 <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\le x\le 0.2\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo>≤</mo> <mi>x</mi> <mo>≤</mo> <mn>0.2</mn> </mrow> </math></EquationSource> </InlineEquation>). X-ray diffraction (XRD) study established the single-phase spinel matrix, and observed slight shifts in peak positions with the addition of Cr<sup>3+</sup> in CCZ SFs. Magnetic response showed that saturation magnetization (<i>M</i><sub>S</sub>) was reduced with Cr<sup>3+</sup> doping. The coercivity (<i>H</i><sub>C</sub>) exhibited a non-linear trend, initially decreasing and then increasing with more Cr<sup>3+</sup> content, while the squareness ratio (<i>SQ</i>) showed varying dependence on Cr<sup>3+</sup> levels. Dielectric properties, investigated as a function of frequency, revealed that Cr<sup>3+</sup> doping enhances the dielectric constant and reduces tangent loss, suggesting improved polarization and lower energy dissipation. These findings demonstrate that Cr<sup>3</sup>⁺ doping in CCZ SFs significantly modifies their structural, magnetic, and dielectric properties.</p>

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Impact of Cr3+ ions doping on the Co0.25Cu0.25Zn0.5Fe2-xCrxO4 spinel ferrites and their structural, morphological, magnetic, and dielectric response

  • 期刊论文

  • 发表日期：

    2026年7月5日

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  • Razia Khan,
  • Safaa N. Abdou,
  • Mohamed M. Ibrahim,
  • Salah M. El-Bahy,
  • Zeinhom M. El-Bahy,
  • A. U. Rahman

摘要

Spinel ferrites with tunable magnetic and dielectric characteristics have attracted considerable attention for applications in high-frequency devices, electromagnetic shielding, microwave absorption, sensors, and energy storage systems. This study explores the impact of Cr3⁺ ions doping on the structural, magnetic, and dielectric behaviour of \({Co}_{0.25}{Cu}_{0.25}{Zn}_{0.5}{Fe}_{2-x}{Cr}_{x}{O}_{4}\) Co 0.25 Cu 0.25 Zn 0.5 Fe 2 - x Cr x O 4 (pure CCZ and Cr-CCZ samples) spinel ferrites (SFs). The as-prepared SFs were prepared via the self-ignition process, with varying doping of Cr3⁺ (0 \(\le x\le 0.2\) ≤ x ≤ 0.2 ). X-ray diffraction (XRD) study established the single-phase spinel matrix, and observed slight shifts in peak positions with the addition of Cr3+ in CCZ SFs. Magnetic response showed that saturation magnetization (MS) was reduced with Cr3+ doping. The coercivity (HC) exhibited a non-linear trend, initially decreasing and then increasing with more Cr3+ content, while the squareness ratio (SQ) showed varying dependence on Cr3+ levels. Dielectric properties, investigated as a function of frequency, revealed that Cr3+ doping enhances the dielectric constant and reduces tangent loss, suggesting improved polarization and lower energy dissipation. These findings demonstrate that Cr3⁺ doping in CCZ SFs significantly modifies their structural, magnetic, and dielectric properties.