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<p>We successfully synthesized single-phase γ′-Fe<sub>4</sub>N and γ′-Fe<sub>4</sub>N/ε-Fe<sub>3</sub>N composite via gas nitridation in an NH<sub>3</sub>/N<sub>2</sub> atmosphere. The microstructure, morphology and magnetic properties of the samples nitrided at various temperatures were characterized using XRD, SEM, TEM, VSM, B-H analyzer and impedance analyzer. Nitriding at high temperatures promotes the formation of single-phase γ′-Fe<sub>4</sub>N, and the <i>M</i><sub><i>s</i></sub> values of the nitrided samples demonstrate an increasing trend with increasing temperature. Notably, the single-phase γ′-Fe<sub>4</sub>N nitrided at 630&#xa0;℃ exhibits a high <i>M</i><sub><i>s</i></sub> value reaching up to 195.9 emu/g, indicating excellent soft magnetic properties. Meanwhile, this sample displays a high Q value and better frequency stability of μ<sub>e</sub> at high frequency, illustrating the remarkable high-frequency magnetic properties. In contrast, the γ′-Fe<sub>4</sub>N/ε-Fe<sub>3</sub>N composite nitrided at 570&#xa0;℃ exhibits relatively low core loss at MHz frequency.</p>

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Effects of nitriding temperatures on the microstructure and soft magnetic properties of iron nitride

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Sicheng Zhai,
  • Qun Wang,
  • Changkuan Zheng,
  • Xing Suo,
  • Yongqing Li

摘要

We successfully synthesized single-phase γ′-Fe4N and γ′-Fe4N/ε-Fe3N composite via gas nitridation in an NH3/N2 atmosphere. The microstructure, morphology and magnetic properties of the samples nitrided at various temperatures were characterized using XRD, SEM, TEM, VSM, B-H analyzer and impedance analyzer. Nitriding at high temperatures promotes the formation of single-phase γ′-Fe4N, and the Ms values of the nitrided samples demonstrate an increasing trend with increasing temperature. Notably, the single-phase γ′-Fe4N nitrided at 630 ℃ exhibits a high Ms value reaching up to 195.9 emu/g, indicating excellent soft magnetic properties. Meanwhile, this sample displays a high Q value and better frequency stability of μe at high frequency, illustrating the remarkable high-frequency magnetic properties. In contrast, the γ′-Fe4N/ε-Fe3N composite nitrided at 570 ℃ exhibits relatively low core loss at MHz frequency.