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<p>Ce<sub>1 − x</sub>Fe<sub>x</sub>O<sub>2</sub> (x ≤ 0.05) nanoparticles were synthesized via chemical co-precipitation and characterized for structural, thermal, optical, and magnetic properties. XRD confirmed a single-phase cubic fluorite structure, while EDX verified near-stoichiometric composition. FE-SEM and TEM showed uniformly distributed nanocrystals (~ 11&#xa0;nm). TGA with Coats-Redfern analysis indicated enhanced oxygen-ion mobility and defect-assisted thermal behavior for Ce<sub>0.95</sub>Fe<sub>0.05</sub>O<sub>2</sub> (Eₐ = 7.91&#xa0;kJ) compared to CeO<sub>2</sub> (Eₐ = 10.38&#xa0;kJ). Optical studies revealed a band gap reduction (2.82 → 2.58&#xa0;eV) and improved visible-light absorption with Fe doping. The magnetic parameters (M<sub>s</sub> ~ 0.003–0.004 emu/g, H<sub>c</sub> ~ 250–300 Oe) confirm the presence of weak, defect-mediated ferromagnetism originating from oxygen-vacancy-induced F-center exchange. Compared with earlier sol-gel and hydrothermal Fe–CeO<sub>2</sub> reports, this work uniquely correlates co-precipitation–derived oxygen vacancy density with thermodynamic and magnetic behavior. These results highlight the role of defect engineering in tuning the multifunctional properties of Fe-doped CeO<sub>2</sub> for spintronic applications.</p>

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Magnetic, Thermodynamic and Optoelectronic Characterization of Fe-Doped CeO2 Nanoparticles Synthesized by Co-Precipitation Method

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Philip Raja S.,
  • Suresh S.,
  • Shankar H.,
  • Venkateswaran C.,
  • Shobana V.

摘要

Ce1 − xFexO2 (x ≤ 0.05) nanoparticles were synthesized via chemical co-precipitation and characterized for structural, thermal, optical, and magnetic properties. XRD confirmed a single-phase cubic fluorite structure, while EDX verified near-stoichiometric composition. FE-SEM and TEM showed uniformly distributed nanocrystals (~ 11 nm). TGA with Coats-Redfern analysis indicated enhanced oxygen-ion mobility and defect-assisted thermal behavior for Ce0.95Fe0.05O2 (Eₐ = 7.91 kJ) compared to CeO2 (Eₐ = 10.38 kJ). Optical studies revealed a band gap reduction (2.82 → 2.58 eV) and improved visible-light absorption with Fe doping. The magnetic parameters (Ms ~ 0.003–0.004 emu/g, Hc ~ 250–300 Oe) confirm the presence of weak, defect-mediated ferromagnetism originating from oxygen-vacancy-induced F-center exchange. Compared with earlier sol-gel and hydrothermal Fe–CeO2 reports, this work uniquely correlates co-precipitation–derived oxygen vacancy density with thermodynamic and magnetic behavior. These results highlight the role of defect engineering in tuning the multifunctional properties of Fe-doped CeO2 for spintronic applications.