On the change in the modulus of elasticity with a decrease in the size of a nanocrystal

被引:15
作者
Magomedov, M. N. [1 ]
机构
[1] Russian Acad Sci, Inst Geothermal Res, Dagestan Sci Ctr, Makhachkala 367030, Dagestan, Russia
基金
俄罗斯基础研究基金会;
关键词
SURFACE-ENERGY; DEPENDENCE; TEMPERATURE; PRESSURE; SILICON;
D O I
10.1134/S1063785013050076
中图分类号
O59 [应用物理学];
学科分类号
摘要
A model of nanocrystal in the form of a rectangular parallelepiped with a variable surface shape is used to show that, at high temperatures, modulus of elasticity B decreases with a decrease in size of the nanocrystal N, which is due to the increase in the surface pressure. However, at low temperatures, dependence B(N) is less pronounced and can even rise with a decrease in the nanocrystal size. This is because, at low temperatures, the increase in the surface pressure (which is larger than at high temperatures) leads to an increase in the modulus of elasticity for the entire nanocrystal. The more the nanocrystal shape deviates from the most energetically stable shape, the more pronounced the change in the dependence B(N) is.
引用
收藏
页码:409 / 412
页数:4
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