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Abstract <p>Magnetic Fe<sub>3</sub>O<sub>4</sub> nanoparticles (NPs) were synthesized by alkaline precipitation from aqueous solutions of divalent and trivalent iron salts. Synthesis of Fe<sub>3-<i>x</i></sub>Gd<sub><i>x</i></sub>O<sub>4</sub> NPs (<i>x</i> = 0.05; 0.1) was performed by adding a calculated amount of Gd(NO<sub>3</sub>)<sub>3</sub>·6H<sub>2</sub>O to the initial solution of iron salt mixture. The phase composition and magnetic properties of the synthesized powders were investigated by X-ray diffraction analysis, <sup>57</sup>Fe Mössbauer spectroscopy and vibration sample magnetometry at temperatures <i>T</i> = 7, 20 and 300 K. The investigations confirmed the formation of NPs of non-stochiometric Fe<sub>3-δ</sub>O<sub>4</sub> magnetite, as well as magnetite doped with Gd<sup>3+</sup> ions. The correlation between the average diameter of NPs of the initial Fe<sub>3-δ</sub>O<sub>4</sub> powder and doped Fe<sub>3-<i>x</i></sub>Gd<sub><i>x</i></sub>O<sub>4</sub> powder and the salt used in the synthesis, as well as the concentration of Gd (<i>x</i>), respectively, was revealed.</p>

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Synthesis and Physicochemical Properties of Magnetic Fe3O4 Particles Doped with Gd(III)

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • Y. D. Mitskevich,
  • M. M. Degtyarik,
  • A. A. Kharchanka,
  • M. V. Bushinsky,
  • J. A. Fedotova

摘要

Abstract

Magnetic Fe3O4 nanoparticles (NPs) were synthesized by alkaline precipitation from aqueous solutions of divalent and trivalent iron salts. Synthesis of Fe3-xGdxO4 NPs (x = 0.05; 0.1) was performed by adding a calculated amount of Gd(NO3)3·6H2O to the initial solution of iron salt mixture. The phase composition and magnetic properties of the synthesized powders were investigated by X-ray diffraction analysis, 57Fe Mössbauer spectroscopy and vibration sample magnetometry at temperatures T = 7, 20 and 300 K. The investigations confirmed the formation of NPs of non-stochiometric Fe3-δO4 magnetite, as well as magnetite doped with Gd3+ ions. The correlation between the average diameter of NPs of the initial Fe3-δO4 powder and doped Fe3-xGdxO4 powder and the salt used in the synthesis, as well as the concentration of Gd (x), respectively, was revealed.