Zhao Xingbin, Li Li, Bao Kuo, Zhu Pinwen, Tao Qiang, Ma Shuailing, Liu Bo, Ge Yufei, Li Da, Cui Tian
State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, People's Republic of China.
Phys Chem Chem Phys. 2020 Dec 7;22(46):27425-27432. doi: 10.1039/d0cp03380d.
Magnetic materials attract great attention due to their fundamental importance and practical application. However, the relatively inferior mechanical properties of traditional magnetic materials limit their application in a harsh environment. In this work, we report an outstanding magnetic material that exhibits both fantastic mechanical and excellent magnetic properties, CuAl2-type Fe2B, synthesized by the high pressure and high temperature method. The magnetic saturation of Fe2B is 156.9 emu g-1 at room temperature and its Vickers hardness is 12.4 GPa which outclasses those of traditional magnetic materials. It exhibits good conductivity with a resistivity of 5.6 × 10-7 Ω m. Fe2B is a promising strong ferromagnetic material with high hardness, which makes it a good candidate for multifunction applications in a harsh environment. The high hardness of Fe2B originates from the Fe-B bond framework, and the strong ferromagnetism is mainly attributed to the large number of unpaired Fe 3d electrons. The competition of Fe 3d electrons to fall into Fe-B bonds or Fe-Fe bonds is the main factor for its magnetism and hardness. This work bridges the chasm between strong ferromagnetism and high hardness communities.
磁性材料因其重要的基础性质和实际应用而备受关注。然而，传统磁性材料相对较差的机械性能限制了它们在恶劣环境中的应用。在这项工作中，我们报道了一种兼具出色机械性能和优异磁性的杰出磁性材料——通过高温高压法合成的CuAl2型Fe2B。Fe2B在室温下的磁饱和强度为156.9 emu g-1，其维氏硬度为12.4 GPa，优于传统磁性材料。它具有良好的导电性，电阻率为5.6×10-7Ω m。Fe2B是一种有前景的强铁磁材料，具有高硬度，这使其成为在恶劣环境中多功能应用的良好候选材料。Fe2B的高硬度源于Fe-B键框架，而强铁磁性主要归因于大量未成对的Fe 3d电子。Fe 3d电子落入Fe-B键或Fe-Fe键的竞争是其磁性和硬度的主要因素。这项工作弥合了强铁磁性和高硬度领域之间的差距。
