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<p>Ni-doped ZnO nanoparticles have been produced by the sol–gel method, including 0, 3, 5, 7, and 9&#xa0;wt.% of Ni relative to Zn precursor salts, following heat treatment at 800&#xa0;°C for 3&#xa0;h. The structural and magnetic characteristics at room temperature were examined for annealed samples. The ZnO wurtzite structure predominates in all samples, as corroborated by XRD and Raman analyses. The Rietveld refinements confirm that an enchantment of the creation of the NiO phase on the surface rises with the addition of Ni to the samples. XRD and Raman data indicate the existence of the secondary NiO face-centered cubic (FCC) rock-salt phase on the surfaces of ZnO nanoparticles. The XRD and SEM data indicate that the incorporation of Ni did not substantially influence the average crystallite size or particle size. The diamagnetic properties of pure ZnO diminish with increasing Ni concentration. This attribute pertains to the augmentation of the permanent magnetic moment at the atomic scale with a rise in Ni ions, hence intensifying the paramagnetism of the doped materials.</p>

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Impact of Post-Heat Treatment on the Crystalline Structure and Magnetic Properties of Sol–Gel-Manufactured Ni-Doped ZnO Nanoparticles

  • 期刊论文

  • 发表日期：

    2026年5月14日

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  • Zakia Hassan Alhashem,
  • Shrouq H. Aleithan

摘要

Ni-doped ZnO nanoparticles have been produced by the sol–gel method, including 0, 3, 5, 7, and 9 wt.% of Ni relative to Zn precursor salts, following heat treatment at 800 °C for 3 h. The structural and magnetic characteristics at room temperature were examined for annealed samples. The ZnO wurtzite structure predominates in all samples, as corroborated by XRD and Raman analyses. The Rietveld refinements confirm that an enchantment of the creation of the NiO phase on the surface rises with the addition of Ni to the samples. XRD and Raman data indicate the existence of the secondary NiO face-centered cubic (FCC) rock-salt phase on the surfaces of ZnO nanoparticles. The XRD and SEM data indicate that the incorporation of Ni did not substantially influence the average crystallite size or particle size. The diamagnetic properties of pure ZnO diminish with increasing Ni concentration. This attribute pertains to the augmentation of the permanent magnetic moment at the atomic scale with a rise in Ni ions, hence intensifying the paramagnetism of the doped materials.