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Double-Zigzag Boron Chain Enhanced Vickers Hardness and Manganese Bilayers Induced High d-electron Mobility in Mn3B4

Abstract

The D7b-type structure Mn3B4 was fabricated by the high temperature and high pressure (HPHT) methods. Hardness exaimination yields asymptotic Vickers hardness of 16.3 GPa which is much higher than that of Mn2B and MnB2. First principle calculations and XPS results demonstrate that double zigzag boron chains are strong covalent skeleton which enhance this structure into integrity with high hardness. Considering that the hardenss of MnB and Mn3B4 is higher than Mn2B and MnB2, zigzag and double zigzag boron backbone is more superior to isolated boron, graphite-like boron layers backbone for higher hardness manganese borides. Contrary to conventional wisdom, this anomalous state that higher boron content is not necessary factors for higher hardness in the low boron content transition metal borides. Futhermore, the co-presence of metallic manganese bilayers contribute to the high d-electrons mobility and generate electrical conductivity and antiferromagnetic in Mn3B4 which provide us a new avenue to design general-purpose high hardness material.

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Publication details

The article was received on 18 Sep 2018, accepted on 21 Nov 2018 and first published on 28 Nov 2018


Article type: Paper
DOI: 10.1039/C8CP05870A
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Double-Zigzag Boron Chain Enhanced Vickers Hardness and Manganese Bilayers Induced High d-electron Mobility in Mn3B4

    S. Ma, B. Kuo, Q. Tao, C. H. Xu, X. Feng, X. Zhao, Y. Ge, P. Zhu and T. Cui, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP05870A

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