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Vol. 37 No. 1 (2025): Vol 37 Issue 1, 2025

Copyright (c) 2024 Asha A. Nawpute, S. V. Rajmane, Sudarshan D. Tapsale, K. M. Jadhav

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Structure, Morphology, DC-Electrical and Dielectric Characteristics of Chromium(III) Substituted Co-Li Ferrite Nanoparticles

https://doi.org/10.14233/ajchem.2025.32918
Asha A. Nawpute
Department of Physics, Dr. Babasaheb Ambedkar Marathwada University, Chhatrapati Sambhajinagar (Aurangabad)-431004, India
https://orcid.org/0000-0001-9164-4941
S.V. Rajmane
Department of Physics, Jawahar Arts, Science & Commerce College, Andur-413603, India
https://orcid.org/0009-0006-4122-3501
Sudarshan D. Tapsale
Department of Education and Extension, Chemistry Science, Savitribai Phule Pune University, Pune-411007, India
https://orcid.org/0009-0008-0920-9608
K.M. Jadhav
Department of Physics, Dr. Babasaheb Ambedkar Marathwada University, Chhatrapati Sambhajinagar (Aurangabad)-431004, India; School of Basic and Applied Sciences, MGM University, Chhatrapati Sambhajinagar (Aurangabad)-431003, India
https://orcid.org/0000-0001-9911-411X

Corresponding Author(s) : Asha A. Nawpute

nawputea@gmail.com

Asian Journal of Chemistry, Vol. 37 No. 1 (2025): Vol 37 Issue 1, 2025

Abstract

In this study, a detailed analysis of the lattice structure, micro-structural features, DC-electrical properties and dielectric characteristics of Cr3+-substituted cobalt-lithium-based ferrite oxide nanoparticles (CoLiFCr NPs) synthesized using a sol-gel method enhanced by synergistic sol-gel auto-combustion is presented. Citric acid monohydrate (C6H8O7·H2O) was utilized as a chelating agent, maintaining a metal nitrate to citrate ratio of 1:3. Substituting Cr3+ in Co-Li ferrite significantly alters its crystal structure, morphological, DC-electrical and dielectric characteristics. The X-ray diffraction (XRD) analysis confirmed the crystalline formation of Co0.8Li0.4Fe2-xCrxO4 nanoparticles (where x = 0.0, 0.2, 0.4 and 0.6); exhibiting the single-phase cubic structure characterized by a spinel configuration, falling under the space group Fd-3mO7h. The lattice constant a for CoLiFCr NPs (x = 0) was measured at 8.338 ± 0.002 Å, which decreased to 8.291 ± 0.002 Å upon Cr substitution (x = 0.6), as confirmed by Cohen’s analytical graphs. The crystallite size (D), determined using the Debye-Scherrer’s formula, ranged from around 18.9 to 29.74 nm. Peak broadening in CoLiFCr NPs was further examined through Williamson-Hall and size strain analyses. The FTIR spectra of CoLiFCr nanoparticles revealed the presence of metal-oxygen (M-O) bonds typical of spinel structures, featuring significant peaks at 443 cm–1 and 537 cm–1. High-resolution transmission electron microscopy (HR-TEM) images showed the single-crystal CoLiFCr NPs with nearly spherical morphologies. The study of optical properties was conducted using UV-visible spectroscopy. The nanoparticles with x = 0.2 displayed high ε' values at 50 Hz, indicating strong polarization capabilities, while those with x = 0.6 exhibited a decrease possibly linked to structural changes affecting polarization. The DC resistivity of CoLiFCr nanoparticles was investigated to understand their electrical behaviour highlighting the influence of substitution of Cr3+ on conductivity.

Keywords

Chromium(III) Co-Li Nanoferrites Sol-gel auto-combustion W-H plot Cohen’s graphs Dielectric property
Nawpute, A. A., Rajmane, S., Tapsale, S. D., & Jadhav, K. (2024). Structure, Morphology, DC-Electrical and Dielectric Characteristics of Chromium(III) Substituted Co-Li Ferrite Nanoparticles. Asian Journal of Chemistry, 37(1), 135–144. https://doi.org/10.14233/ajchem.2025.32918
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