Elastic Properties of High-Symmetry Sb4O6 Cage-Molecular Crystal,The Journal of Physical Chemistry Letters

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Elastic Properties of High-Symmetry Sb4O6 Cage-Molecular Crystal
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2021-09-13 , DOI: 10.1021/acs.jpclett.1c02160
Congcong Wu ₁ , Jun Peng ₁ , Weiwen Pu ₁ , Shengnan Lu ₁ , Chao Zhang _{1,

2} , Nan Wu ₁ , Zhaoru Sun ₁ , Hongti Zhang ₁ , Hung-Ta Wang ₁

Affiliation

The cubic-phase antimony trioxide (α-Sb₂O₃) is a room-temperature stable molecular crystal, composed of cage-like tetraantimony hexoxide (Sb₄O₆) molecules. Despite its versatile functionality, the van der Waals (vdW) bond-dominated nanomechanics is still unclear. Here, the bending plate-like linear behaviors of high-quality α-Sb₂O₃ nanoflakes were observed using the nanoindentation method. It is found that the cage-molecular crystal owns a very low in-plane Young’s modulus of 14.9 ± 0.8 GPa and a remarkable maximum tensile strain of 6.0–8.8%, corresponding to a rupture strength of 0.89–1.31 GPa. Elucidated by the atomistic simulations, the compliant elastic modulus and the unexpectedly strong rupture strain are associated with the high-symmetry vdW bonding structure. The vdW nanomechanics is of fundamental and technological relevance to nanoelectronics.

中文翻译：

高对称性 Sb4O6 笼状分子晶体的弹性特性

立方相三氧化二锑 (α-Sb ₂ O ₃ ) 是一种室温稳定的分子晶体，由笼状四氧化二锑 (Sb ₄ O ₆ ) 分子组成。尽管具有多种功能，但范德华 (vdW) 键主导的纳米力学仍不清楚。这里，优质α-Sb ₂ O ₃的弯曲板状线性行为使用纳米压痕法观察纳米薄片。发现笼状分子晶体具有非常低的面内杨氏模量，为 14.9 ± 0.8 GPa，显着的最大拉伸应变为 6.0-8.8%，对应于 0.89-1.31 GPa 的断裂强度。通过原子模拟阐明，柔性弹性模量和出乎意料的强断裂应变与高对称性 vdW 键合结构有关。vdW 纳米力学与纳米电子学具有基础和技术相关性。

更新日期：2021-09-23

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