| Pressure-induced structural transition of OsN2 and effect of metallic bonding on its hardness | |
| Wang, Zhen-Hua1; Kuang, Xiao-Yu1,2; Zhong, Ming-Min1; Lu, Peng1; Mao, Ai-Jie1; Huang, Xiao-Fen3 | |
| Corresponding Author | Wang, Zhen-Hua() |
| 2011-09-01 | |
| Source Publication | EPL
 |
| ISSN | 0295-5075 |
| Volume | 95Issue:6Pages:6 |
| Abstract | Using first-principles calculations, the elastic constant, structural phase transition and effect of metallic bonding on the hardness of OsN2 under high pressure are investigated by means of the pseudopotential plane-waves method. Five candidate structures are chosen to investigate for OsN2, namely, the pyrite, CoSb2-type, marcasite, simple hexagonal and tetragonal structures. A comparison among the formation energies of OsN2 explains the synthesis of OsN2 marcasite under high pressure. On the basis of the third-order Birch-Murnaghan equation of states, the transition pressure P-t (P-t = 223 GPa) between the marcasite and simple tetragonal phase is determinated. Elastic constants, shear modulus, Young's modulus, Poisson's ratio and Debye temperature are derived. The calculated values are, generally speaking, in good agreement with experiments and other theoretical calculations. Our calculation indicates that the N-N bond length is one determinative factor for the ultrahigh bulk moduli of the heavy-transition-metal dinitrides. Moreover, based on Mulliken overlap population analysis in first-principles technique, a semiempirical method to evaluate the hardness of multicomponent crystals with partial metallic bonding is presented. The effect of metallic bonding on the hardness of OsN2 is investigated and the hardness shows a gradual decrease rather than increase under compression, which is different from diamond. This is a quantitative investigation on the structural properties of OsN2, and it still awaits experimental confirmation. Copyright (C) EPLA, 2011 |
| Funding Organization | Education Ministry of China ; National Natural science Foundation of China |
| DOI | 10.1209/0295-5075/95/66005 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | Education Ministry of China[20100181110086] ; National Natural science Foundation of China[10974138] |
| WOS Research Area | Physics |
| WOS Subject | Physics, Multidisciplinary |
| WOS ID | WOS:000294996600025 |
| Publisher | EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/105148 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Wang, Zhen-Hua |
| Affiliation | 1.Sichuan Univ, Inst Atom & Mol Phys, Chengdu 610065, Peoples R China 2.Acad Sinica, Int Ctr Mat Phys, Shenyang 110016, Peoples R China 3.Sichuan Normal Univ, Dept Phys, Chengdu 610068, Peoples R China |
| Recommended Citation GB/T 7714 | Wang, Zhen-Hua,Kuang, Xiao-Yu,Zhong, Ming-Min,et al. Pressure-induced structural transition of OsN2 and effect of metallic bonding on its hardness[J]. EPL,2011,95(6):6. |
| APA | Wang, Zhen-Hua,Kuang, Xiao-Yu,Zhong, Ming-Min,Lu, Peng,Mao, Ai-Jie,&Huang, Xiao-Fen.(2011).Pressure-induced structural transition of OsN2 and effect of metallic bonding on its hardness.EPL,95(6),6. |
| MLA | Wang, Zhen-Hua,et al."Pressure-induced structural transition of OsN2 and effect of metallic bonding on its hardness".EPL 95.6(2011):6. |
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