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Abstract <p>Lanthanum doped cobalt manganese nanoferrites (Co<sub>0.5</sub>Mn<sub>0.5</sub>La<sub><i>x</i></sub>Fe<sub>2–<i>x</i></sub>O<sub>4</sub>, where <i>x</i> ranges from 0.00 to 0.08) were synthesized using sol–gel technique to examine their structural, functional, morphological and magnetic characteristics. X-ray diffraction results confirmed the formation of a cubic spinel structure, with crystallite sizes decreasing from 26 to 12 nm as concentration of La<sup>3+</sup> increased. The larger ionic radius of La<sup>3+</sup> ions caused lattice expansions. Field emission scanning electron microscopy and energy dispersive X-ray spectroscopy (EDX) showed that the particles had a spherical shape, minimal agglomeration and were free of impurities. Fourier transform infrared (FTIR) spectroscopy confirmed the presence of metal – oxide bonds, typical of spinel ferrites. Magnetic properties revealed a decrease in magnetic saturation (Ms) and increase in coercivity (Hc) with higher La<sup>3+</sup> doping, which was influenced by smaller grain size, induced strain and magneto – crystalline anisotropy. The results suggest that La–doped Co–Mn nanoferrites could be suitable for application in microwave absorption, magnetic shielding and advanced electronic technologies.</p>

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Effects of Lanthanum Doping on the Structural, Morphological and Magnetic Properties of Cobalt-Manganese Nanoferrites Synthesized by Sol–Gel Method

  • 期刊论文

  • 发表日期：

    2025年10月12日

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  • A. Rajeshwari,
  • M. Gurumoorthy,
  • A. Muthuvel,
  • M. Jothibas,
  • Manikandan Ayyar,
  • Madhappan Santhamoorthy,
  • Samiah Alhabardi

摘要

Abstract

Lanthanum doped cobalt manganese nanoferrites (Co0.5Mn0.5LaxFe2–xO4, where x ranges from 0.00 to 0.08) were synthesized using sol–gel technique to examine their structural, functional, morphological and magnetic characteristics. X-ray diffraction results confirmed the formation of a cubic spinel structure, with crystallite sizes decreasing from 26 to 12 nm as concentration of La3+ increased. The larger ionic radius of La3+ ions caused lattice expansions. Field emission scanning electron microscopy and energy dispersive X-ray spectroscopy (EDX) showed that the particles had a spherical shape, minimal agglomeration and were free of impurities. Fourier transform infrared (FTIR) spectroscopy confirmed the presence of metal – oxide bonds, typical of spinel ferrites. Magnetic properties revealed a decrease in magnetic saturation (Ms) and increase in coercivity (Hc) with higher La3+ doping, which was influenced by smaller grain size, induced strain and magneto – crystalline anisotropy. The results suggest that La–doped Co–Mn nanoferrites could be suitable for application in microwave absorption, magnetic shielding and advanced electronic technologies.