Chemical segregation mechanism and magnetic properties of Sm2Co17-based permanent magnets: experimental investigation and first-principles calculations

Zhu, Shengzhi; Ge, Yicheng; Li, Liya; Du, Yong

doi:10.1016/j.jallcom.2023.170899

Journal of Alloys and Compounds

2023

DOI: 10.1016/j.jallcom.2023.170899

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Chemical segregation mechanism and magnetic properties of Sm2Co17-based permanent magnets: experimental investigation and first-principles calculations

Shengzhi Zhu

Yicheng Ge

Liya Li

et al.

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Cited by 4 publications

References 52 publications

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A General Synthesis of Soft Magnetic 2:17‐Type Rare‐Earth Cobalt Nanoalloys Decorated with Graphite as High‐Frequency Electromagnetic Materials

Ma,

Li,

Tian

et al. 2024

Adv Funct Materials

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A general approach is reported to fabricate a series of single‐phase 2:17‐type rare‐earth cobalt (RE2Co17, RE = Y, Ce, Pr, Nd, and Gd) nanoalloys by precisely controlled calcium thermic reduction of amorphous RE‐Co precursors. High‐purity hexagonal RE2Co17 phases are formed without the precipitation of Co and the other RE‐Co phases through the accurately manipulated co‐reduction of the two ions, which avoids the disadvantages of the impurity or second phases for RE metal alloys. RE2Co17/graphite nanostructures constructed with flower‐like RE2Co17 nanoalloys superficially decorated with nanosized graphite are further fabricated by introducing graphene oxides into the co‐reduction process. Compared with traditional magnetic planar‐anisotropy RE2Co17 alloys, the preserved high saturation magnetization (51.2–102.9 A m2 kg−1) and unusually increased coercivity (152–310.5 Oe) are achieved in these graphite‐decorated RE2Co17 nanoalloys. Moreover, these RE2Co17/graphite nanostructures exhibit good microwave absorption with an applied frequency range of 11.76–18 GHz, which shows their potential applications as new‐type Ku‐band electromagnetic materials. This work provides a facial way for the large‐scale production for varieties of single‐phase 2:17‐type RE‐Co nanoalloys and expands their application fields by constructing novel composite structures.

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A General Synthesis of Soft Magnetic 2:17‐Type Rare‐Earth Cobalt Nanoalloys Decorated with Graphite as High‐Frequency Electromagnetic Materials

Ma,

Li,

Tian

et al. 2024

Adv Funct Materials

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Atomic-scale revelation of Cu diffusion mechanism in high-performance Pr-doped 2:17-type SmCo magnets

Zhu,

Liu,

Luo

et al. 2025

Acta Materialia

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Prediction of Sm- (Co, Cu, Fe, Zr) binary alloys’ thermodynamic parameters by improved miedema model

Zhu,

Fang,

et al. 2024

Mater. Res. Express

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Currently, the original Miedema mixing enthalpy model yields calculation results that exhibit some discrepancies when compared to experimental data. Therefore, improving the precision of the Miedema model is essential to advance its development and application in developing samarium–cobalt permanent magnet alloys. To address this issue, the enthalpies of mixing for Sm–(Co, Cu, Fe, Zr) binary alloys were calculated using the modified model. In addition, the mixing enthalpy (ΔH), excess entropy (S E ), excess Gibbs free energy (G E ), component activity (α) and binary Gibbs free energy of Sm–Co and Sm–Fe were calculated. The results indicate that the improved Miedema model more accurately matches the experimental values. Sm– (Co, Fe, Cu) binary alloys tend to form intermetallic compounds easily, whereas Sm–Zr does not. The ΔH, S E and G E of Sm-(Co, Fe) are negative, and the activity of each component shows a considerable negative deviation from Raoult’s law in contrast to that of an ideal solution. In the range of 1550 ∼ 1620 K, the Gibbs free energy of SmCo5 and Sm2Co17 reactions is negative with the Sm2Co17 phase being thermodynamically more stable than the SmCo5 phase.

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Chemical segregation mechanism and magnetic properties of Sm2Co17-based permanent magnets: experimental investigation and first-principles calculations

Cited by 4 publications

References 52 publications

A General Synthesis of Soft Magnetic 2:17‐Type Rare‐Earth Cobalt Nanoalloys Decorated with Graphite as High‐Frequency Electromagnetic Materials

A General Synthesis of Soft Magnetic 2:17‐Type Rare‐Earth Cobalt Nanoalloys Decorated with Graphite as High‐Frequency Electromagnetic Materials

Atomic-scale revelation of Cu diffusion mechanism in high-performance Pr-doped 2:17-type SmCo magnets

Prediction of Sm- (Co, Cu, Fe, Zr) binary alloys’ thermodynamic parameters by improved miedema model

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