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<p>Ag-substituted cobalt ferrites were synthesized using a green extract of <i>Moringa oleifera</i> gum by the sol–gel method. The synthesized CoAg<sub>x</sub>Fe<sub>2-x</sub>O<sub>4</sub> (<i>x</i> = 0–0.4) were characterized by XRD, SEM-EDX, and Raman spectroscopy. The XRD and Raman spectra analyses indicated the presence of a cubic spinel structure. The findings suggest that as the Ag content increases, there is an increase in the lattice parameter values. The Raman spectra of cobalt ferrite exhibited incremental alterations with the rise in Ag substitution. An analysis of the elastic properties revealed a decline in elastic constants with higher Ag content. Notably, Ag substitution displayed a direct correlation with average sound velocity and elastic constants. Additionally, dielectric properties were examined across different frequencies, and their dispersion was analyzed using Koop’s theory in alignment with Maxwell–Wagner polarization. Cole–Cole plots of the samples showed single semicircles which indicates that the electrical conduction is due to grain boundaries.</p> Graphical Abstract <p></p>

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Effect of Ag on dielectric, elastic, electrical impedance, and Raman spectroscopic properties of CoFe2O4

  • 期刊论文

  • 发表日期：

    2025年1月10日

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  • Qudsiya Y. Tamboli,
  • Ibraheem Bushnak,
  • Sunil M. Patange,
  • Kranti R. Zakde,
  • K. M. Jadhav

摘要

Ag-substituted cobalt ferrites were synthesized using a green extract of Moringa oleifera gum by the sol–gel method. The synthesized CoAgxFe2-xO4 (x = 0–0.4) were characterized by XRD, SEM-EDX, and Raman spectroscopy. The XRD and Raman spectra analyses indicated the presence of a cubic spinel structure. The findings suggest that as the Ag content increases, there is an increase in the lattice parameter values. The Raman spectra of cobalt ferrite exhibited incremental alterations with the rise in Ag substitution. An analysis of the elastic properties revealed a decline in elastic constants with higher Ag content. Notably, Ag substitution displayed a direct correlation with average sound velocity and elastic constants. Additionally, dielectric properties were examined across different frequencies, and their dispersion was analyzed using Koop’s theory in alignment with Maxwell–Wagner polarization. Cole–Cole plots of the samples showed single semicircles which indicates that the electrical conduction is due to grain boundaries.

Graphical Abstract