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Molecular-dynamics simulation of structure and thermal behaviour of boron nitride nanotubes

机译:氮化硼纳米管的结构和热行为的分子动力学模拟

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摘要

We investigate the structure and thermal behaviour of boron nitride (BN) nanotubes using molecular-dynamics simulations based on the Tersoff-like potential. The strain energy decreases with increasing diameter, which is proportional to the inverse square of the tube diameter on the basis of continuum elastic theory. The disintegration temperature of zigzag nanotubes is smaller than that of armchair nanotubes of nearly the same diameter and increases with increasing diameter due to the decrease in strain energy. Despite homoelemental bonds, the Stone-Wales (SW) defect is found in BN nanotubes during thermal treatment. The formation energy of the SW defect increases with increasing tube diameter. These results agree well with the trend for carbon nanotubes.
机译:我们使用基于Tersoff样电势的分子动力学模拟研究氮化硼(BN)纳米管的结构和热行为。应变能随直径的增加而减小,根据连续弹性理论,该应变能与管直径的平方成反比。之字形纳米管的崩解温度小于几乎相同直径的扶手椅状纳米管的崩解温度,并且由于应变能的降低而随直径的增加而增加。尽管存在同质键,热处理期间在BN纳米管中发现了Stone-Wales(SW)缺陷。 SW缺陷的形成能随着管直径的增加而增加。这些结果与碳纳米管的趋势非常吻合。

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