arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1610.08588cond-mat.mtrl-scicond-mat.mes-hallphysics.comp-ph
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第一性原理计算预测全氢化硼氢化物的新晶体结构

New crystal structure prediction of fully hydrogenated borophene by first principles calculations

Zhi-Qiang Wang, Tie-Yu Lü, Hui-Qiong Wang, Yuan Ping Feng, Jin-Cheng Zheng

摘要:

用第一性原理计算预测了全氢化硼杂环丁烷的新晶体结构。与文献报道的椅型硼杂环己烷(C-硼杂环己烷)相比,我们得到了四种新的硼杂环己烷构象,它们的总能量要低得多。最稳定的一种是搓板状的硼杂环丁烷(W-硼杂环丁烷),其能量比C-硼杂环丁烷低约113.41 meV/atom。为了解释不同硼杂环己烷构象的相对稳定性,计算了B-H二聚体的原子构型、态密度、电荷转移、电荷密度分布和缺陷形成能。结果表明,硼原子向氢原子的电荷转移对硼杂环己烷的稳定性起着决定性的作用。在不同的硼杂环己烷构象中,B和H原子之间的成键特征相似,但W-硼杂环己烷中的B-B键比C-硼杂环己烷或其他结构中的B-B键强得多。此外,我们还通过声子色散研究了硼钒构象的动力学稳定性,发现这四种新的构象都是动力学稳定的。最后讨论了硼钒构象沿任意方向的力学性质。W-硼杂环丁烷具有独特的电子结构(狄拉克锥)、良好的稳定性和优异的机械性能。硼氢化钨在纳米电子器件中具有广阔的应用前景。

英文摘要:

New crystal structures of fully hydrogenated borophene (borophane) have been predicted by first principles calculation. Comparing with the chair-like borophane (C-boropane) that has been reported in literature, we obtained four new borophane conformers with much lower total-energy. The most stable one, washboard-like borophane (W-borophane), has energy about 113.41 meV/atom lower than C-borophane. In order to explain the relative stability of different borophane conformers, the atom configuration, density of states, charge transfer, charge density distribution and defect formation energy of B-H dimer have been calculated. The results show that the charge transfer from B atoms to H atoms is crucial for the stability of borophane. In different borophane conformers, the bonding characteristics between B and H atoms are similar, but the B-B bonds in W-borophane are much stronger than that in C-borophane or other structures. In addition, we examined the dynamical stability of borophane conformers by phonon dispersions and found that the four new conformers are all dynamically stable. Finally the mechanical properties of borophane conformers along an arbitrary direction have been discussed. W-borophane possesses unique electronic structure (Dirac cone), good stability and superior mechanical properties. W-borophane has broad perspective for nano electronic device.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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