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<p>The Co<sub>x</sub>Cd<sub>1−x</sub>Fe<sub>2</sub>O<sub>4</sub> (where x = 0.0, 0.25, 0.5, 0.75, and 1.0) nanoferrites were formed successfully using the co-precipitation technique. The optical, structural, and magnetic characteristics of the formed nanoferrites were studied. The powder XRD results revealed the formation of single-phase cubic spinel ferrites with crystallite sizes ranging from 35 to 77&#xa0;nm. The FTIR analysis showed two significant fundamental bands corresponding to the intrinsic stretching vibrations of metal atoms located at tetrahedral and octahedral sites. The Raman scattering results confirmed the IR results and revealed the enhanced localized disorder at both tetrahedral and octahedral sublattices with an increase in Cobalt (Co) content. The optical band gap was determined by the UV-visible spectroscopy. The optical band gap value estimated from Tauc plots was found to decrease from 3.08&#xa0;eV to 2.78&#xa0;eV with increasing Co content. The effects of Co<sup>2+</sup> substitution on Mossbauer parameters such as line width, isomer shift, quadrupole splitting, and hyperfine magnetic field were also investigated. The magnetic hysteresis (M-H) curve was measured for each manufactured sample at room temperature using a SQUID-based magnetometer. Saturation magnetization (Ms) was observed to increase from 0.29 to 44.96 (emu/g) with an increase in Co concentration. Co-Cd ferrites displayed (S-shaped) hysteresis loops, indicating ferromagnetic behavior of the compounds for x = 0.5 to 1.0. The coercivity of pure cobalt ferrite CoFe<sub>2</sub>O<sub>4</sub> was larger than that of the Co-doped cadmium ferrite. The Mossbauer analysis revealed the superparamagnetic behavior of the present ferrite composition for x = 0.25. The paramagnetic doublets in Mossbauer spectrum with quadruple splitting (<i>Δ</i>) = 0.871&#xa0;mm/s and line width (<i>Γ</i>) <i>=</i> 0.644&#xa0;mm/s are assigned as core.</p>

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Study on structural, optical, magnetic, and Mossbauer properties of nanostructured CoxCd1−xFe2O4 (with x = 0.0, 0.25. 0.5, 0.75 and1.0) formed via co-precipitation method

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Chanda Kumari,
  • Vijay Kumar Mishra,
  • Pankaj Kumar Tripathi,
  • Hemant Kumar Dubey,
  • Preeti Lahiri,
  • Suresh Kumar Patel,
  • Vandna Rani Verma,
  • Parma Nand

摘要

The CoxCd1−xFe2O4 (where x = 0.0, 0.25, 0.5, 0.75, and 1.0) nanoferrites were formed successfully using the co-precipitation technique. The optical, structural, and magnetic characteristics of the formed nanoferrites were studied. The powder XRD results revealed the formation of single-phase cubic spinel ferrites with crystallite sizes ranging from 35 to 77 nm. The FTIR analysis showed two significant fundamental bands corresponding to the intrinsic stretching vibrations of metal atoms located at tetrahedral and octahedral sites. The Raman scattering results confirmed the IR results and revealed the enhanced localized disorder at both tetrahedral and octahedral sublattices with an increase in Cobalt (Co) content. The optical band gap was determined by the UV-visible spectroscopy. The optical band gap value estimated from Tauc plots was found to decrease from 3.08 eV to 2.78 eV with increasing Co content. The effects of Co2+ substitution on Mossbauer parameters such as line width, isomer shift, quadrupole splitting, and hyperfine magnetic field were also investigated. The magnetic hysteresis (M-H) curve was measured for each manufactured sample at room temperature using a SQUID-based magnetometer. Saturation magnetization (Ms) was observed to increase from 0.29 to 44.96 (emu/g) with an increase in Co concentration. Co-Cd ferrites displayed (S-shaped) hysteresis loops, indicating ferromagnetic behavior of the compounds for x = 0.5 to 1.0. The coercivity of pure cobalt ferrite CoFe2O4 was larger than that of the Co-doped cadmium ferrite. The Mossbauer analysis revealed the superparamagnetic behavior of the present ferrite composition for x = 0.25. The paramagnetic doublets in Mossbauer spectrum with quadruple splitting (Δ) = 0.871 mm/s and line width (Γ) = 0.644 mm/s are assigned as core.