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<p>Nanoparticles of nickel ferrite have been synthesized via the sol-gel auto-combustion method, offering a versatile approach to control their structural, optical, and dielectric properties. Structural analysis using X-ray diffraction (XRD) confirmed the formation of single-phase spinel structure. FTIR analysis indicates the presence of Ni-O and Fe-O bond. Scanning electron microscopy (SEM) reveals the existence of high dense agglomerated grains, indicating pore free crystallites on the surface part. The optical properties evaluated through UV-Vis spectroscopy revels a direct energy band gap of 1.53&#xa0;eV, demonstrating characteristic absorption bands in the visible and near-infrared regions, crucial for applications in photocatalysis and optical devices. Dielectric measurements across varying frequencies and temperatures elucidates the nanoparticles’ capacitive behavior. The minimum values of dielectric constant and dielectric loss are 2.72 and 0.98, respectively at room temperature. From Nyquist plot, it can clearly identify the negative temperature coefficient of resistance (NTCR) behavior because the size of the semicircles decreases as temperature rises, indicating a decrease in resistance. Overall, this comprehensive analysis provides insights into optimizing the synthesis parameters and understanding the multifaceted properties of nickel ferrite nanoparticles synthesized via sol-gel auto-combustion, paving the way for their tailored applications in advanced materials and device engineering.</p>

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Structural, Optical and Dielectric Properties of Nickel Ferrite Nanoparticles Synthesized Via Sol-Gel Auto-Combustion Method

  • 期刊论文

  • 发表日期：

    2025年12月27日

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  • Satya Ranjan Sahoo,
  • Jyoshnarani Mohapatra,
  • Pragyan Mohanty,
  • Ranjita Mahapatra,
  • Chhatrapati Parida,
  • Dilip Kumar Mishra

摘要

Nanoparticles of nickel ferrite have been synthesized via the sol-gel auto-combustion method, offering a versatile approach to control their structural, optical, and dielectric properties. Structural analysis using X-ray diffraction (XRD) confirmed the formation of single-phase spinel structure. FTIR analysis indicates the presence of Ni-O and Fe-O bond. Scanning electron microscopy (SEM) reveals the existence of high dense agglomerated grains, indicating pore free crystallites on the surface part. The optical properties evaluated through UV-Vis spectroscopy revels a direct energy band gap of 1.53 eV, demonstrating characteristic absorption bands in the visible and near-infrared regions, crucial for applications in photocatalysis and optical devices. Dielectric measurements across varying frequencies and temperatures elucidates the nanoparticles’ capacitive behavior. The minimum values of dielectric constant and dielectric loss are 2.72 and 0.98, respectively at room temperature. From Nyquist plot, it can clearly identify the negative temperature coefficient of resistance (NTCR) behavior because the size of the semicircles decreases as temperature rises, indicating a decrease in resistance. Overall, this comprehensive analysis provides insights into optimizing the synthesis parameters and understanding the multifaceted properties of nickel ferrite nanoparticles synthesized via sol-gel auto-combustion, paving the way for their tailored applications in advanced materials and device engineering.