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Size Model of Critical Temperature for Grain Growth in Nano V and Au |
| LU Yun-Bin1,2, LIAO Shu-Zhi1**, PENG Hao-Jun1, ZHANG Chun3, ZHOU Hui-Ying4, XIE Hao-Wen1, OUYANG Yi-Fang5, ZHANG Bang-Wei6,7
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1Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics, Hunan Normal University, Changsha 410081
2College of Mathematics and Physics, University of South China, Hengyang 421001
3College of Mathematics and Computer Science, Hunan Normal University, Changsha 410081
4Computer and Information Engineering School, Central South University of Forestry and Technology, Changsha 410004
5Department of Physics, Guangxi University, Nanning 530004
6Department of Applied Physics, Hunan University, Changsha 410082
7International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110015
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| Cite this article: |
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LU Yun-Bin, LIAO Shu-Zhi, PENG Hao-Jun et al 2011 Chin. Phys. Lett. 28 080502 |
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Abstract The intrinsic thermodynamical factors that dominate the stability of nanocrystallines are investigated through the microcosmic process of grain growth. The results suggest that nanocrystallines grows at a certain temperature and the critical temperature is determined by the vacancy formation energy and diffusion activation energy of the nanocrystallines. Based on the hypothesis, a simple model is proposed to predict the size-dependent critical temperature of grain growth. Within this model, we investigate the thermal stability of nanocrystallines V and Au, compared with the results available. It is shown that the critical temperature decreases with decreasing size, showing an evident size effect. The research reveals that the thermal stability is dependent on the energetic state of the nanocrystallines and the mobility of the inner atoms.
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| Keywords:
05.70.Jk
82.60.Cx
81.10.Aj
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Received: 23 September 2010
Published: 28 July 2011
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| PACS: |
05.70.Jk
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(Critical point phenomena)
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82.60.Cx
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(Enthalpies of combustion, reaction, and formation)
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81.10.Aj
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(Theory and models of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)
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