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<p>This study investigates the impact of Ni substitution (x = 0.2, 0.6, 1.0) on the structural and phase evolution in non-stoichiometric cobalt ferrites (Ni<sub>x</sub>Co<sub>1.5-x</sub>Fe<sub>1.5</sub>O<sub>4</sub>) synthesized via the auto-combustion method using sucrose as a fuel. All synthesized samples were characterized using XRD, FTIR, SEM, XPS, VSM, and UV-visible. XRD confirmed the formation of a spinel structure, with lattice contraction as Ni content increased and crystallite size decreasing from 90.823&#xa0;nm to 70.115&#xa0;nm. Rietveld refinements and XPS revealed cation redistribution, confirming the progressive substitution of Co²⁺ by Ni²⁺ and its impact on the electronic environment. SEM showed a transition from agglomerated particles to well-faceted grains, suggesting enhanced crystallization and densification at higher Ni concentrations. EDS analysis validated Ni incorporation, and the bandgap increases from 1.85&#xa0;eV to 2.35&#xa0;eV due to structural modifications and quantum confinement. Magnetic measurements indicated a variation in saturation magnetization between 34.0 and 100.9 emu/g. These findings emphasize the role of non-stoichiometry and cation substitution in tailoring the structural, optical, and magnetic properties of Ni-Co ferrites for targeted applications.</p>

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Structural, properties and compositional modifications in non-stoichiometric Ni-substituted cobalt ferrites

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • Hacen Boussafel,
  • Charafeddine Sedrati,
  • Safia Alleg,
  • Abderraouf Zine,
  • Mathieu Frégnaux,
  • Reem Tambosi,
  • Nouari Kebaili

摘要

This study investigates the impact of Ni substitution (x = 0.2, 0.6, 1.0) on the structural and phase evolution in non-stoichiometric cobalt ferrites (NixCo1.5-xFe1.5O4) synthesized via the auto-combustion method using sucrose as a fuel. All synthesized samples were characterized using XRD, FTIR, SEM, XPS, VSM, and UV-visible. XRD confirmed the formation of a spinel structure, with lattice contraction as Ni content increased and crystallite size decreasing from 90.823 nm to 70.115 nm. Rietveld refinements and XPS revealed cation redistribution, confirming the progressive substitution of Co²⁺ by Ni²⁺ and its impact on the electronic environment. SEM showed a transition from agglomerated particles to well-faceted grains, suggesting enhanced crystallization and densification at higher Ni concentrations. EDS analysis validated Ni incorporation, and the bandgap increases from 1.85 eV to 2.35 eV due to structural modifications and quantum confinement. Magnetic measurements indicated a variation in saturation magnetization between 34.0 and 100.9 emu/g. These findings emphasize the role of non-stoichiometry and cation substitution in tailoring the structural, optical, and magnetic properties of Ni-Co ferrites for targeted applications.