Structural stability and magnetic properties of disordered SmCo7-xMx (M=metal) modulated by valence electron structure

doi:10.1088/1674-1056/ae1729

中国物理B ›› 2026, Vol. 35 ›› Issue (5): 56104-056104.doi: 10.1088/1674-1056/ae1729

Structural stability and magnetic properties of disordered SmCo_7-xM_x (M=metal) modulated by valence electron structure

Wei Liu(刘葳), Yongquan Guo(郭永权)^†, Boyang Li(李博洋), Yu Yao(姚羽), Haitao Kong(孔海涛), and Yichen Feng(冯奕晨)

School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

收稿日期:2025-08-26 修回日期:2025-10-08 接受日期:2025-10-24 发布日期:2026-05-15
通讯作者: Yongquan Guo E-mail:yqguo@ncepu.edu.cn

Structural stability and magnetic properties of disordered SmCo_7-xM_x (M=metal) modulated by valence electron structure

Wei Liu(刘葳), Yongquan Guo(郭永权)^†, Boyang Li(李博洋), Yu Yao(姚羽), Haitao Kong(孔海涛), and Yichen Feng(冯奕晨)

School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

Received:2025-08-26 Revised:2025-10-08 Accepted:2025-10-24 Published:2026-05-15
Contact: Yongquan Guo E-mail:yqguo@ncepu.edu.cn

1. 2026-056104-SI.pdf(1238KB)

摘要/Abstract

摘要： SmCo$_{7-x}M_{x}$ ($M={\rm Cu}$, Zr, Hf, Si, Ga) intermetallic compounds, with distinctive disordered crystal structure and excellent magnetic performance, are of great importance for application as high-temperature rare-earth permanent magnets. In this study, the relationship between the valence electronic structure, structural stability and magnetic and thermal properties of Sm(Co, $M$)$_{7}$ intermetallic compounds is revealed by using an empirical electron theory of solids and molecules. The structural stability is strongly related to the valence electronic structure that is modulated by doping the third element $M$ into SmCo$_{7}$. The calculated bond lengths, magnetic moments and Curie temperatures show good agreement with experimental ones. The magnetic moment and Curie temperature strongly depend on the number of 3d magnetic electrons, and can be modulated by mutual electron transformation between 3d magnetic electron and covalence electron.

关键词: Sm (Co,$M$)$_7$pseudo-binary intermetallics, valence electron structure, structural stability, magnetic property

Abstract: SmCo$_{7-x}M_{x}$ ($M={\rm Cu}$, Zr, Hf, Si, Ga) intermetallic compounds, with distinctive disordered crystal structure and excellent magnetic performance, are of great importance for application as high-temperature rare-earth permanent magnets. In this study, the relationship between the valence electronic structure, structural stability and magnetic and thermal properties of Sm(Co, $M$)$_{7}$ intermetallic compounds is revealed by using an empirical electron theory of solids and molecules. The structural stability is strongly related to the valence electronic structure that is modulated by doping the third element $M$ into SmCo$_{7}$. The calculated bond lengths, magnetic moments and Curie temperatures show good agreement with experimental ones. The magnetic moment and Curie temperature strongly depend on the number of 3d magnetic electrons, and can be modulated by mutual electron transformation between 3d magnetic electron and covalence electron.

Key words: Sm (Co,$M$)$_7$pseudo-binary intermetallics, valence electron structure, structural stability, magnetic property

中图分类号: (Crystal binding; cohesive energy)

61.50.Lt

75.50.-y (Studies of specific magnetic materials) 78.40.Kc (Metals, semimetals, and alloys) 31.10.+z (Theory of electronic structure, electronic transitions, and chemical binding)

Wei Liu(刘葳), Yongquan Guo(郭永权), Boyang Li(李博洋), Yu Yao(姚羽), Haitao Kong(孔海涛), and Yichen Feng(冯奕晨). Structural stability and magnetic properties of disordered SmCo_7-xM_x (M=metal) modulated by valence electron structure[J]. 中国物理B, 2026, 35(5): 56104-056104.

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Structural stability and magnetic properties of disordered SmCo_7-xM_x (M=metal) modulated by valence electron structure

Structural stability and magnetic properties of disordered SmCo_7-xM_x (M=metal) modulated by valence electron structure

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