Rhombohedral superhard structure of BC2N

Rhombohedral superhard structure of BC2N
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BC2N菱面体超硬结构

DOI:
10.1063/1.3086649
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发表时间:
2009-03
影响因子:
3.2
通讯作者:
Cui, Tian
Cui, Tian
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Oganov, Artem R.;Ma, Yanming;Li, Quan;Zou, Guangtian;Wang, Mei;Cui, Tian

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采用从头算进化算法对所观察到的BC 2N超硬材料的晶体结构进行了解析。我们发现了两个多晶型体,菱形(2 f.u./细胞)和正交(2 f.u./细胞)对称性,用它可以很好地再现实验X射线衍射图。总能量结果和模拟的能量损失近边光谱的分析表明,菱面体结构是最好的候选人的超硬BC 2N。我们进一步证明了早期提出的高密度和低密度形式可能来自这个单一的菱形相。
Ab initio evolutionary algorithm was employed to resolve the crystal structure of the observed superhard BC2N. We uncovered two polymorphs with rhombohedral (2 f.u./cell) and orthorhombic (2 f.u./cell) symmetries, with which the experimental x-ray diffraction pattern is well reproduced. Analysis of the total energy results and the simulated energy-loss near-edge spectroscopy suggests that the rhombohedral structure is the best candidate for the superhard BC2N. We further demonstrated that earlier proposed high density and low density forms are likely from this single rhombohedral phase.
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