| Temperature effect on elastic modulus of thin films and nanocrystals |
| Liang LH(梁立红) ; Li MZ(李美之); Qin FQ(秦福麒); Wei YG(魏悦广); Liang LH (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100080, Peoples R China
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| 发表期刊 | PHILOSOPHICAL MAGAZINE
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| 2013-02-01
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| 卷号 | 93期号:6页码:574-583 |
| ISSN | 1478-6435
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| 摘要 | The stability of nanoscale devices is directly related to elasticity and the effect of temperature on the elasticity of thin films and nanocrystals. The elastic instability induced by rising temperature will cause the failure of integrated circuits and other microelectronic devices in service. The temperature effect on the elastic modulus of thin films and nanocrystals is unclear although the temperature dependence of the modulus of bulk materials has been studied for over half a century. In this paper, a theoretical model of the temperature-dependent elastic modulus of thin films and nanocrystals is developed based on the physical definition of the modulus by considering the size effect of the related cohesive energy and the thermal expansion coefficient. Moreover, the temperature effect on the modulus of Cu thin films is simulated by the molecular dynamics method. The results indicate that the elastic modulus decreases with increasing temperature and the rate of the modulus decrease increases with reducing thickness of thin films. The theoretical predictions based on the model are consistent with the results of computational simulations, semi-continuum calculations and the experimental measurements for Cu, Si thin films and Pd nanocrystals. |
| 关键词 | Cohesive Energy
Nanocrystals
Thermal Expansion
Size Effect
Vibration Entropy
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| 学科领域 | 固体力学
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| URL | 查看原文
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| 收录类别 | SCI
; EI
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| 语种 | 英语
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| WOS记录号 | WOS:000322305500001
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| 项目资助者 | National Basic Research Program of China [2012CB937500]; National Natural Science Foundation of China [10802088, 10832008, 11023001, 11021262, 10932011, 91116003]; the Opening Fund of LNM
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| 课题组名称 | LNM新型材料及结构的多尺度力学
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| 论文分区 | 一类
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/46938
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| 专题 | 非线性力学国家重点实验室
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| 通讯作者 | Liang LH (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100080, Peoples R China |
推荐引用方式
GB/T 7714 |
Liang LH,Li MZ,Qin FQ,et al. Temperature effect on elastic modulus of thin films and nanocrystals[J]. PHILOSOPHICAL MAGAZINE,2013,93,6,:574-583.
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| APA |
梁立红,李美之,秦福麒,魏悦广,&Liang LH .(2013).Temperature effect on elastic modulus of thin films and nanocrystals.PHILOSOPHICAL MAGAZINE,93(6),574-583.
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| MLA |
梁立红,et al."Temperature effect on elastic modulus of thin films and nanocrystals".PHILOSOPHICAL MAGAZINE 93.6(2013):574-583.
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