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<p>To investigate the effect of doping alumina with cobalt and manganese, three nanopowders were synthesized in this study using the sol-gel method, a technique widely recognized for its versatility in soft chemistry. The synthesized nanopowders included pure alumina, manganese-doped alumina, and cobalt-doped alumina, using aluminum nitrate, cobalt nitrate, and manganese nitrate as precursors, with ethanol as the solvent and citric acid as a chelating agent. Following thermal treatment and magnetic stirring, the resulting gels were subjected to analysis. A portion of the gels underwent thermal characterization via DTA/TGA, while the remainder was calcined at varying temperatures to obtain the final powders. The resulting powders were subsequently characterized in detail using Fourier Transform Infrared Spectroscopy (FT-IR), UV-Visible Spectroscopy, Optical Microscopy, and X-ray Diffraction (XRD). The analyses revealed a single α-Al₂O₃ phase for pure alumina, with a crystallite size of 42&#xa0;nm. In the case of cobalt-doped alumina, two distinct phases, Co₃O₄ and Co₂AlO₄, were identified, with a crystallite size of 48&#xa0;nm. Manganese-doped alumina exhibited a multiphase structure consisting of Mn₃O₄, α-Al₂O₃, and γ-Al₂O₃, with the smallest crystallite size of 24&#xa0;nm. <b>Purpose</b>: This study explores the potential for enhancing the performance of alumina powders through the addition of manganese or cobalt during the doping process. <b>Findings</b>: The incorporation of Mn and Co dopants directly affects the structural properties and morphology of the alumina powders, leading to phase transformations and crystallite size variations. <b>Originality</b>: The doping of alumina with manganese and cobalt remains underexplored, making this study a valuable contribution toward understanding the real impact of Mn and Co doping on alumina’s structural and performance characteristics.</p>

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Characterization of Manganese and Cobalt Doping Effects in Sol-Gel Synthesized Alumina Powder

  • 期刊论文

  • 发表日期：

    2025年8月8日

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  • Hamza Hara,
  • Rassim Younes,
  • Mohand Amokrane Bradai,
  • Mikhael Alymov

摘要

To investigate the effect of doping alumina with cobalt and manganese, three nanopowders were synthesized in this study using the sol-gel method, a technique widely recognized for its versatility in soft chemistry. The synthesized nanopowders included pure alumina, manganese-doped alumina, and cobalt-doped alumina, using aluminum nitrate, cobalt nitrate, and manganese nitrate as precursors, with ethanol as the solvent and citric acid as a chelating agent. Following thermal treatment and magnetic stirring, the resulting gels were subjected to analysis. A portion of the gels underwent thermal characterization via DTA/TGA, while the remainder was calcined at varying temperatures to obtain the final powders. The resulting powders were subsequently characterized in detail using Fourier Transform Infrared Spectroscopy (FT-IR), UV-Visible Spectroscopy, Optical Microscopy, and X-ray Diffraction (XRD). The analyses revealed a single α-Al₂O₃ phase for pure alumina, with a crystallite size of 42 nm. In the case of cobalt-doped alumina, two distinct phases, Co₃O₄ and Co₂AlO₄, were identified, with a crystallite size of 48 nm. Manganese-doped alumina exhibited a multiphase structure consisting of Mn₃O₄, α-Al₂O₃, and γ-Al₂O₃, with the smallest crystallite size of 24 nm. Purpose: This study explores the potential for enhancing the performance of alumina powders through the addition of manganese or cobalt during the doping process. Findings: The incorporation of Mn and Co dopants directly affects the structural properties and morphology of the alumina powders, leading to phase transformations and crystallite size variations. Originality: The doping of alumina with manganese and cobalt remains underexplored, making this study a valuable contribution toward understanding the real impact of Mn and Co doping on alumina’s structural and performance characteristics.