文献类型：期刊文献

英文题名：The role of sp2 and sp3 hybridized bonds on the structural, mechanical, and electronic properties in a hard BN framework

作者：Bu, Hongxia[1];Zheng, Haibin[1];Zhou, Hongcai[2];Zhang, Hongyu[3];Yang, Zaifa[1];Liu, Zhie[1];Wang, Hui[1];Xu, Qi[1]

机构：[1]Qilu Normal Univ, Coll Phys & Elect Engn, Jinan 250200, Shandong, Peoples R China;[2]Qingdao Agr Univ, Sci & Informat Coll, Qingdao 266109, Shandong, Peoples R China;[3]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China

年份：2019

卷号：9

期号：5

起止页码：2657

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20190506444463);WOS:【SCI-EXPANDED(收录号:WOS:000457379300040)】；

基金：This work is supported by National Natural Science Foundation of China (No. 11604170), Scientific Research in Universities of Shandong Province (No. J16LJ06), the Natural Science Foundation of Shandong Province, China (No. ZR2014AQ018, ZR2014FL029), National Natural Science Foundation of China (No. 11747132), and Foundation of Qilu Normal University (No. BS2017002, 2017005, 2017L0604).

语种：英文

外文关键词：Energy gap - Calculations - Electronic structure - Structural properties - Electronic properties - Stability

摘要：A first-principles approach is used to systematically investigate the role of sp(2) and sp(3) hybridized bonds on the structural, mechanical, and electronic properties in a new BN phase (denoted Hex-(BN)(12)). Hex-(BN)(12) has the same number of sp(2) and sp(3) hybridized atoms. The calculated cohesion energy, phonon frequencies, and elastic constants unambiguously confirm the structural stability of this compound. Due to the different types of hybridization and B-N covalent bonds with ionic characteristics, Hex-(BN) 12 has unequal bond lengths and bond angles in these hybrid orbitals. These cause the relative energetic stability to be slightly lower than c-BN and w-BN. The hardness of Hex-(BN) 12 is estimated to range from 33 to 40 GPa. The bond-breaking order under stress is sp(3)-sp(3), sp(2)-sp(3), and sp(2)-sp(2). DFT calculations with the gradient approximation (GGA) and HSE06 functional indicate the electronic structure contains an indirect band gap at 3.21 and 4.42 eV, respectively. The electronic states in the region near the Fermi level primarily arise from the 2p orbitals in sp(2)-hybridized atoms. In general, sp(3) bonded B and N atoms guarantee higher mechanical properties, and sp(2) bonded atoms ensure ductility and even conductivity, although all changes vary with spatial structure. Hex-(BN)(12) can be obtained from multilayer yne-BN, and BN nanosheets, nanotubes and nanoribbons under pressure.