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<p>This study successfully synthesizes pure-phase Ni-doped MgMn₂O₄ spinel nanoparticles (Mg₀.₇₅Ni₀.₂₅Mn₂O₄, denoted MMNO) via a facile self-templating method. X-ray diffraction (XRD) analysis confirms the formation of a pure cubic spinel structure, with Ni doping reducing the average crystallite size from 10.9 nm (pristine MgMn₂O₄ denoted MMO) to 5.6 nm and inducing compressive lattice strain. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) analysis validates a homogeneous morphology and confirms successful Ni incorporation. Fourier-transform infrared (FTIR) spectroscopy reveals distinct shifts in metal–oxygen vibrational bands, indicating stronger bonding and a redshift phenomenon, alongside a notable enhancement in infrared absorption. The complex dielectric function and optical constants (refractive index, extinction coefficient), extracted from FTIR data using Kramers–Kronig relations, demonstrate an improved dielectric response for MMNO. Tauc analysis further confirms a reduction in the direct optical bandgap from 2.63 eV to 2.48 eV. The concurrent refinement in structural characteristics and the enhancement of tunable optical properties suggest the potential of these Ni-doped MgMn₂O₄ nanoparticles for further exploration in areas such as advanced optical materials and energy-related systems.</p>

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Study of structural and optical properties of Ni-doped MgMn₂O₄ spinel nanoparticles synthesized by a self-templating method

  • 期刊论文

  • 发表日期：

    2026年4月10日

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  • Esmaeil Pakizeh,
  • Ali Zeinodiny,
  • Rezvan Rostami

摘要

This study successfully synthesizes pure-phase Ni-doped MgMn₂O₄ spinel nanoparticles (Mg₀.₇₅Ni₀.₂₅Mn₂O₄, denoted MMNO) via a facile self-templating method. X-ray diffraction (XRD) analysis confirms the formation of a pure cubic spinel structure, with Ni doping reducing the average crystallite size from 10.9 nm (pristine MgMn₂O₄ denoted MMO) to 5.6 nm and inducing compressive lattice strain. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) analysis validates a homogeneous morphology and confirms successful Ni incorporation. Fourier-transform infrared (FTIR) spectroscopy reveals distinct shifts in metal–oxygen vibrational bands, indicating stronger bonding and a redshift phenomenon, alongside a notable enhancement in infrared absorption. The complex dielectric function and optical constants (refractive index, extinction coefficient), extracted from FTIR data using Kramers–Kronig relations, demonstrate an improved dielectric response for MMNO. Tauc analysis further confirms a reduction in the direct optical bandgap from 2.63 eV to 2.48 eV. The concurrent refinement in structural characteristics and the enhancement of tunable optical properties suggest the potential of these Ni-doped MgMn₂O₄ nanoparticles for further exploration in areas such as advanced optical materials and energy-related systems.