Boron concentration drives boron substructure and properties derivation in manganese borides

IF 4.6 2区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
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.

Abstract Image

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
iScience Multidisciplinary-Multidisciplinary
CiteScore
7.20
自引率
1.70%
发文量
1972
审稿时长
6 weeks
期刊介绍: Science has many big remaining questions. To address them, we will need to work collaboratively and across disciplines. The goal of iScience is to help fuel that type of interdisciplinary thinking. iScience is a new open-access journal from Cell Press that provides a platform for original research in the life, physical, and earth sciences. The primary criterion for publication in iScience is a significant contribution to a relevant field combined with robust results and underlying methodology. The advances appearing in iScience include both fundamental and applied investigations across this interdisciplinary range of topic areas. To support transparency in scientific investigation, we are happy to consider replication studies and papers that describe negative results. We know you want your work to be published quickly and to be widely visible within your community and beyond. With the strong international reputation of Cell Press behind it, publication in iScience will help your work garner the attention and recognition it merits. Like all Cell Press journals, iScience prioritizes rapid publication. Our editorial team pays special attention to high-quality author service and to efficient, clear-cut decisions based on the information available within the manuscript. iScience taps into the expertise across Cell Press journals and selected partners to inform our editorial decisions and help publish your science in a timely and seamless way.
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