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<p>In this research work, the solid-state reaction method was used to synthesize (Gd, Ni) doped cerium oxide Ce<sub>(2-(x+y))</sub> Gd<sub>x</sub>Ni<sub>y</sub>O<sub>2</sub> powder samples. The Characteristics of annealed sample powders and the effect of annealing on these properties were investigated. XRD confirmed the cubic structure. Due to the Gd–Ni content, the crystallite size varied from 38.95 to 25.71&#xa0;nm, while the lattice parameters improved from 5.431 to 5.501 Ǻ. Surface morphology (SEM) was almost spherical, and particle diameter grew with Gd–Ni concentration. Elemental studies (EDAX) confirmed that O, Ce, Gd, and Ni achieve the desired atomic ratio. According to the optical investigations, the optical band gap of the powders increases from 2.712 to 3.150&#xa0;eV. The photoluminescence (PL) analysis of pure and Ce<sub>(2-(x+y)</sub> Gd<sub>x</sub>Ni<sub>y</sub>O<sub>2</sub> nanopowders at excitation wavelengths of 407&#xa0;nm displayed indigo, green, orange, and red emission in the 425–800&#xa0;nm range. From the Vibrating Sample Magnetometer (VSM) studies, the magnetic characteristics revealed for nanopowder samples present paramagnetic properties. The magnetic moment of pure and Gd–Ni doped samples varies from 0.0047 to 0.0635&#xa0;emu/g, with a coercive field ranging from 16.34 to 2.94 Oe. The outcome observed is analyzed and deliberated upon in this study.</p>

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Rare earth and transition metals (Gd–Ni) codoped CeO2 nanopowders: synthesis, structural, optical and magnetic properties

  • 期刊论文

  • 发表日期：

    2025年8月14日

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  • G. Chinna Venkata Subbaiah,
  • Nasina Madhusudhana Rao,
  • Nakka Praveenkumar,
  • Y. P. Venkata Subbaiah,
  • Anju Babu,
  • S. Harinath Babu

摘要

In this research work, the solid-state reaction method was used to synthesize (Gd, Ni) doped cerium oxide Ce(2-(x+y)) GdxNiyO2 powder samples. The Characteristics of annealed sample powders and the effect of annealing on these properties were investigated. XRD confirmed the cubic structure. Due to the Gd–Ni content, the crystallite size varied from 38.95 to 25.71 nm, while the lattice parameters improved from 5.431 to 5.501 Ǻ. Surface morphology (SEM) was almost spherical, and particle diameter grew with Gd–Ni concentration. Elemental studies (EDAX) confirmed that O, Ce, Gd, and Ni achieve the desired atomic ratio. According to the optical investigations, the optical band gap of the powders increases from 2.712 to 3.150 eV. The photoluminescence (PL) analysis of pure and Ce(2-(x+y) GdxNiyO2 nanopowders at excitation wavelengths of 407 nm displayed indigo, green, orange, and red emission in the 425–800 nm range. From the Vibrating Sample Magnetometer (VSM) studies, the magnetic characteristics revealed for nanopowder samples present paramagnetic properties. The magnetic moment of pure and Gd–Ni doped samples varies from 0.0047 to 0.0635 emu/g, with a coercive field ranging from 16.34 to 2.94 Oe. The outcome observed is analyzed and deliberated upon in this study.