High-Temperature Ferromagnetism of the Iron-Based FCC Phase: The Effect of Carbon and Nickel,Physica Status Solidi (B) - Basic Solid State Physics

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High-Temperature Ferromagnetism of the Iron-Based FCC Phase: The Effect of Carbon and Nickel
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2022-08-04 , DOI: 10.1002/pssb.202200248
M.A. Uimin ₁ , A.Ye. Yermakov ₁ , A.V. Korolev ₁ , M.I. Kurkin ₁ , A.S. Konev _{1,

2} , S.I. Novikov ₁ , A.S. Minin _{1,

2} , A.S. Volegov ₂ , V.S. Gaviko ₁

Affiliation

The phase composition and magnetic properties of FeNi nanoparticles encapsulated in carbon with a nickel content of about 10% are studied in comparison with FeNi nanoparticles of similar composition without carbon coating. The Fe₉₁Ni₉ particles have the body centered cubic structure, whereas the Fe₈₈Ni₁₂@C particles have the face centered cubic (FCC) structure. The Fe₈₈Ni₁₂@C particles are characterized with a rather high magnetization of 60 emu g⁻¹ in the field of 30 kOe at 5 K and 40 emu g⁻¹ at 300 K. The monotonous behavior of magnetization with temperature gives grounds to assume that the Fe₈₈Ni₁₂@C particles retain the FCC structure over the entire temperature range down to 5 K. It is concluded that the stabilization of FCC phase of Fe₈₈Ni₁₂@C and the ferromagnetic state of this FCC phase are related to a large concentration of carbon in the core of the nanoparticles.

中文翻译：

铁基 FCC 相的高温铁磁性：碳和镍的影响

研究了包覆在镍含量约为 10% 的碳中的 FeNi 纳米粒子的相组成和磁性，并与没有碳包覆的类似成分的 FeNi 纳米粒子进行了比较。Fe ₉₁ Ni ₉颗粒具有体心立方结构，而Fe ₈₈ Ni ₁₂ @C颗粒具有面心立方(FCC)结构。Fe ₈₈ Ni ₁₂ @C 颗粒的特征是在 5 K 的 30 kOe磁场中具有 60 emu g ^-1的相当高的磁化强度，在 300 K 的磁场中具有 40 emu g ^-1的磁化强度。磁化强度随温度的单调行为提供了理由假设 Fe ₈₈ Ni₁₂ @C 颗粒在低至 5 K 的整个温度范围内保持 FCC 结构。得出的结论是，Fe ₈₈ Ni ₁₂ @C 的 FCC 相的稳定性和该 FCC 相的铁磁态与高浓度的碳有关在纳米粒子的核心。

更新日期：2022-08-04

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