Boron concentration drives boron substructure and properties derivation in manganese borides

IF 4.6 2区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

iScience Pub Date : 2025-06-02 DOI:10.1016/j.isci.2025.112803

Shuailing Ma , Yuyue Pang , Kuo Bao , Min Lian , Shuying Wu , Chunyan Zhao , Chunhong Xu , Qiang Tao , Xingbin Zhao , Pinwen Zhu , Tian Cui

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Abstract

Transition metal borides are important superhard multifunctional materials, in which boron concentration predetermined crystal and properties. However, the principles for effectively controlling properties through boron concentration remain unclear. Here, we reported the evolution of crystal structure, hardness, and magnetic behavior with boron concentration. Boron atoms tend to form isolated boron, boron chains, boron nets, and three-dimensional boron frameworks as boron concentration rises. The Vickers hardness initially increases from Mn₂B to Mn₃B₄, then drops at MnB₂, and finally reaches the highest value for MnB₄, which suggest higher boron concentration is not a necessary factor for higher hardness, and the motifs of boron backbone are equally crucial. Moreover, boron sub-structure act as mediators of long-range ferromagnetic interactions, as evidenced by the evolution of magnetic behavior from paramagnetic, ferromagnetic, antiferromagnetic, and then paramagnetic behavior. These findings underscore the importance of manipulating boron backbone motifs to achieve high harness and superior magnetic properties.

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硼浓度驱动硼化物中硼的亚结构和性质派生

过渡金属硼化物是一种重要的超硬多功能材料，硼的浓度决定了其晶体和性能。然而，通过硼浓度有效控制性能的原理仍不清楚。在这里，我们报道了晶体结构、硬度和磁性行为随硼浓度的变化。随着硼浓度的升高，硼原子倾向于形成孤立的硼、硼链、硼网和三维硼框架。从Mn2B到Mn3B4，维氏硬度先升高，然后在MnB2处下降，最后在MnB4处达到最大值，说明高硼浓度不是高硬度的必要因素，硼主链基序也同样重要。此外，硼的亚结构作为远程铁磁相互作用的介质，其磁性行为从顺磁性、铁磁性、反铁磁性到顺磁性的演化过程证明了这一点。这些发现强调了操纵硼主基序以获得高线束和优越磁性质的重要性。

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来源期刊

iScience Multidisciplinary-Multidisciplinary

CiteScore

7.20

自引率

1.70%

发文量

1972

审稿时长

6 weeks

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