中国物理B ›› 2020, Vol. 29 ›› Issue (10): 103102-.doi: 10.1088/1674-1056/aba097

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Ming-Wei Chen(陈明伟)1, Zhao Liang(梁钊)1, Mei-Ling Liu(刘美玲)1, Uppalapati Pramod Kumar1, Chao Liu(刘超)1,†(), Tong-Xiang Liang(梁彤祥)1,‡()   

  • 收稿日期:2020-03-18 修回日期:2020-06-11 接受日期:2020-06-29 出版日期:2020-10-05 发布日期:2020-10-05
  • 通讯作者: Chao Liu(刘超), Tong-Xiang Liang(梁彤祥)

First principles study of post-boron carbide phases with icosahedra broken

Ming-Wei Chen(陈明伟), Zhao Liang(梁钊), Mei-Ling Liu(刘美玲), Uppalapati Pramod Kumar, Chao Liu(刘超)†, and Tong-Xiang Liang(梁彤祥)‡   

  1. 1 Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China
  • Received:2020-03-18 Revised:2020-06-11 Accepted:2020-06-29 Online:2020-10-05 Published:2020-10-05
  • Contact: Corresponding author. E-mail: liuchao198967@126.com Corresponding author. E-mail: liang_tx@126.com
  • About author:
    †Corresponding author. E-mail: liuchao198967@126.com
    ‡Corresponding author. E-mail: liang_tx@126.com
    * Project supported by the National Natural Science Foundation of China (Grant Nos. 51871114 and 12064013), the Natural Science Foundation of Jiangxi Province, China (Grant No. 20202BAB214010), the Research Foundation of the Education Department of Jiangxi Province, China (Grant Nos. GJJ180433 and GJJ180477), the Open Funds of the State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, China (Grant No. 201906), the Ganzhou Science and Technology Innovation Project, China (Grant No. 201960), and the Jiangxi University of Science and Technology Scientific Research Starting Foundation, China (Grant No. jxxjbs17053).

Abstract:

Boron carbide (B4C) is a rhombic structure composed of icosahedra and atomic chains, which has an important application in armored materials. The application of B4C under super high pressure without failure is a hot spot of research. Previous studies have unmasked the essential cause of B4C failure, i.e., its structure will change subjected to impact, especially under the non-hydrostatic pressure and shear stress. However, the change of structure has not been clearly understood nor accurately determined. Here in this paper, we propose several B4C polymorphs including B4C high pressure phases with non-icosahedra, which are denoted as post-B4C and their structures are formed due to icosahedra broken and may be obtained through high pressure and high temperature (HPHT). The research of their physical properties indicates that these B4C polymorphs have outstanding mechanical and electrical properties. For instance, aP10, mC10, mP20, and oP10-B4C are conductive superhard materials. We hope that our research will enrich the cognition of high pressure structural deformation of B4C and broaden the application scope of B4C.

Key words: boron carbide, structural transformation, icosahedra broken, physical properties, first principles

中图分类号: 

  • 31.15.E-
61.50.Ks (Crystallographic aspects of phase transformations; pressure effects) 71.20.-b (Electron density of states and band structure of crystalline solids) 91.60.Gf (High-pressure behavior)