Scholarlink

<p>Herein, Ni²⁺–Al³⁺ co-doped Co<sub>0.6−x</sub>Zn<sub>0.4−x</sub>Ni<sub>x</sub>Al<sub>x</sub>Fe<sub>2</sub>O<sub>4</sub> (0 ≤ x ≤ 0.08) nanoferrites were synthesized via a co-precipitation route to elucidate the role of defect engineering and cation redistribution in tuning optical magneto-structural properties. X-ray diffraction (XRD) confirmed single-phase cubic spinel formation with slight lattice expansion (8.3667–8.374 Å) accompanied by crystallite size reduction (16.27–11.33&#xa0;nm). HRTEM and SAED analyses revealed spherical/cubic nanoparticles with high crystallinity and lattice coherence, consistent with XRD results. The increase in microstrain and dislocation density indicates enhanced lattice distortion induced by substitution. XPS analysis revealed mixed Fe²⁺/Fe³⁺ states distributed over tetrahedral and octahedral sites, enabling quantitative cation distribution modeling. The pronounced enhancement of the Raman A<sub>1g</sub> mode confirms progressive tetrahedral distortion and cation rearrangement. The nanoferrites exhibit soft magnetic behavior with high saturation magnetization (51–58 emu/g) and low coercivity (20–79 Oe). The law of approach to saturation (LAS) analysis reveals a marked decrease in the anisotropy constant, primarily attributed to the dilution of octahedral Co²⁺ ions, reinforced by Al³⁺-induced A–B exchange weakening and nanoscale spin canting. These findings demonstrate that controlled multi-cation substitution provides an effective strategy for tailoring magnetic softness and anisotropy, making the materials promising for spintronics, high-frequency electronics, magnetic sensing, and electromagnetic interference shielding applications.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Tailoring the microstructure, optical, and magnetic characteristics of Co0.6Zn0.4Fe2O4 nanoferrites through Ni²⁺–Al³⁺ co-doping

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月2日

查看全文
  • M. Rekaby,
  • M. Ahmed,
  • R. Awad,
  • M. Y. El Sayed,
  • M. A. Abu-Saied,
  • A. I. Abou-Aly

摘要

Herein, Ni²⁺–Al³⁺ co-doped Co0.6−xZn0.4−xNixAlxFe2O4 (0 ≤ x ≤ 0.08) nanoferrites were synthesized via a co-precipitation route to elucidate the role of defect engineering and cation redistribution in tuning optical magneto-structural properties. X-ray diffraction (XRD) confirmed single-phase cubic spinel formation with slight lattice expansion (8.3667–8.374 Å) accompanied by crystallite size reduction (16.27–11.33 nm). HRTEM and SAED analyses revealed spherical/cubic nanoparticles with high crystallinity and lattice coherence, consistent with XRD results. The increase in microstrain and dislocation density indicates enhanced lattice distortion induced by substitution. XPS analysis revealed mixed Fe²⁺/Fe³⁺ states distributed over tetrahedral and octahedral sites, enabling quantitative cation distribution modeling. The pronounced enhancement of the Raman A1g mode confirms progressive tetrahedral distortion and cation rearrangement. The nanoferrites exhibit soft magnetic behavior with high saturation magnetization (51–58 emu/g) and low coercivity (20–79 Oe). The law of approach to saturation (LAS) analysis reveals a marked decrease in the anisotropy constant, primarily attributed to the dilution of octahedral Co²⁺ ions, reinforced by Al³⁺-induced A–B exchange weakening and nanoscale spin canting. These findings demonstrate that controlled multi-cation substitution provides an effective strategy for tailoring magnetic softness and anisotropy, making the materials promising for spintronics, high-frequency electronics, magnetic sensing, and electromagnetic interference shielding applications.