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Abstract <p>Ni<sub>0.5</sub>Zn<sub>0.5−<i>x</i></sub>Cu<sub><i>x</i></sub>Fe<sub>2</sub>O<sub>4</sub> (<i>x</i>  =  0, 0.05, 0.1, 0.15, 0.2, 0.25) spinel ferrite nanoparticles were synthesized via the sol-gel auto-combustion method and sintered at 700°C for 5 h. Thermogravimetric and differential thermal analysis (TG-DTA) revealed the thermal decomposition behaviour. Single phase ferrite with <i>Fd</i>‑3<i>m</i> space group was confirmed by the Rietveld refinement of X-ray diffraction data. The distribution of cation among octahedral B and tetrahedral A-site was estimated by the computational method. With increasing copper substitution, the lattice parameter decreased while X-ray density increased. Crystallite sizes ranged from 22 to 24 nm, consistent with the Williamson–Hall method, and strain decreased. Fourier-transform infrared (FTIR) spectroscopy confirmed the spinel structure. High-resolution transmission electron microscopy (HR-TEM) and field emission scanning electron microscopy (FE-SEM) showed grain sizes between 70 and 130 nm. Energy dispersive X-ray (EDAX) analysis confirmed chemical purity. Magnetic studies showed an increase in saturation magnetization and coercivity (42 to 57 Oe) with copper substitution, while dielectric behaviour followed the Maxwell–Wagner model.</p>

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Impact of Copper Substitution on the Structural Refinement, Magnetic Behaviour, and Dielectric Response of Ni–Zn Spinel Ferrites

  • 期刊论文

  • 发表日期：

    2025年2月27日

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  • Arti A. Ingle,
  • Akash V. Fulari,
  • Rameshwar B. Borade,
  • S.B. Kadam,
  • V. D. Mote,
  • A. B. Kadam,
  • Sagar E. Shirsath,
  • R. H. Kadam

摘要

Abstract

Ni0.5Zn0.5−xCuxFe2O4 (x  =  0, 0.05, 0.1, 0.15, 0.2, 0.25) spinel ferrite nanoparticles were synthesized via the sol-gel auto-combustion method and sintered at 700°C for 5 h. Thermogravimetric and differential thermal analysis (TG-DTA) revealed the thermal decomposition behaviour. Single phase ferrite with Fd‑3m space group was confirmed by the Rietveld refinement of X-ray diffraction data. The distribution of cation among octahedral B and tetrahedral A-site was estimated by the computational method. With increasing copper substitution, the lattice parameter decreased while X-ray density increased. Crystallite sizes ranged from 22 to 24 nm, consistent with the Williamson–Hall method, and strain decreased. Fourier-transform infrared (FTIR) spectroscopy confirmed the spinel structure. High-resolution transmission electron microscopy (HR-TEM) and field emission scanning electron microscopy (FE-SEM) showed grain sizes between 70 and 130 nm. Energy dispersive X-ray (EDAX) analysis confirmed chemical purity. Magnetic studies showed an increase in saturation magnetization and coercivity (42 to 57 Oe) with copper substitution, while dielectric behaviour followed the Maxwell–Wagner model.