Eco-friendly green synthesis and characterizations of CoFe2-x AlxO4 nanocrystals: analysis of structural, magnetic, electrical, and dielectric properties

Abstract

This work reports, thermal, structural, magnetic, electric, and dielectric investigations of the CoFe2-xAlxO4 nanocrystals synthesized through eco-friendly green sol–gel auto-ignition route. X-ray diffractograms exposed the uni-phasic geometry with Fd3m_\({\text{O}}_{{\text{h}}}^{7}\) space group. The standard crystallite sizes were found in between 24 and 44 nm, confirming the nano-crystalline dimension. FTIR analysis confirmed the two specific vibrational stretching bands corresponding to the spinel ferrite geometry. The surface topology of ferrite nanocrystals with size distribution was effectively observed from TEM micrographs. The magnetic study at room temperature showed lessening in saturation magnetization with rise in Al3+ concentrations, ascribed to the replacement of Fe3+ ions by paramagnetic Al3+ ions. The M–H loops showed the perfect loop of typical soft ferromagnetic behavior of the produced nano-ferrites. The saturation magnetization, coercivity, and magneto-crystalline anisotropy declines with the upsurge in Al3+ ions which is owing to the non-magnetic contamination in the magnetic matrix. The DC-electrical resistivity was enhanced with growing temperature along with Al3+ content x. The dielectric parameters boosted pointedly with Al3+ substitution and decline exponentially with a rise in frequency in compliance with ‘Koops’ phenomenological theory. All the outcomes show that Al3+ substitution influences the physical characteristics of cobalt ferrite nanocrystals which shows its suitability in various technological applications.

Graphic abstract

The graphical abstract presenting the synthesis reaction, TEM micrograph (along with crystallite size distribution) and M–H plots for CoFe2-xAlxO4 nanocrystals.

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Acknowledgements

One of the authors (Dr. Apparao R. Chavan) is thankful to the Punyashlok Ahilyadevi Holkar University, Solapur, IIT Madras, and IIT Kanpur for providing XRD, VSM, and TEM characterization facilities.

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ARC: Formal analysis, investigation, methodology, data curation, visualization, writing original draft. PKD: Conceptualization, investigation, methodology, writing-review & editing. SBS: Formal analysis, visualization. SVM: Data curation, validation. KMJ: Supervision.

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Correspondence to Apparao R. Chavan or Pankaj P. Khirade.

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Chavan, A.R., Khirade, P.P., Somvanshi, S.B. et al. Eco-friendly green synthesis and characterizations of CoFe2-x AlxO4 nanocrystals: analysis of structural, magnetic, electrical, and dielectric properties. J Nanostruct Chem (2021). https://doi.org/10.1007/s40097-020-00381-7

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Keywords

  • Green synthesis
  • Spinel ferrite
  • Structural
  • Magnetic
  • Electric properties