| GaAs纳米晶体压致相变的尺寸模型 |
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| 引用本文： | 吕云宾,廖树帜,谢斌,陈佳. GaAs纳米晶体压致相变的尺寸模型[J]. 南华大学学报(自然科学版), 2012, 26(2): 61-65 |
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| 作者姓名： | 吕云宾 廖树帜 谢斌 陈佳 |
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| 作者单位： | 1. 南华大学数理学院,湖南衡阳421001 湖南师范大学教育部低维量子结构与调控重点实验室,湖南长沙410081
2. 湖南师范大学教育部低维量子结构与调控重点实验室,湖南长沙,410081 |
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| 基金项目： | 湖南省科技厅科研基金资助项目(2009FJ3153) |
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| 摘 要： | 基于晶体相变压力和结合能的关系,提出了一种简单的热力学模型计算尺寸依赖的纳米晶体压致相变压力.根据该模型研究了GaAs纳米晶体压致相变的尺寸效应,结果表明GaAs纳米晶体稳定性的下降导致其相变压力随尺度的减小而降低.当尺寸进一步减小时,纳米晶体的相变压力随着尺寸减小急剧降低,显示了强烈的尺寸效应.该模型计算结果与分子动力学模拟结果显示了较好的一致性.
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| 关 键 词： | 砷化镓 纳米晶体 压致相变 尺寸模型 |
| 收稿时间： | 2012-04-15 |
The Size Model of Pressure-induced Phase Transition in GaAs Nanocrystals |
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| LV Yun-bin,LIAO Shu-zhi,XIE Bin,CHEN Ji. The Size Model of Pressure-induced Phase Transition in GaAs Nanocrystals[J]. Journal of Nanhua University(Science and Technology), 2012, 26(2): 61-65 |
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| Authors: | LV Yun-bin LIAO Shu-zhi XIE Bin CHEN Ji |
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| Affiliation: | 1.School of Mathematics and Physics,University of South China,Hengyang,Hunan 421001,China; 2.Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education,Hunan Normal University,Changsha,Hunan 410081,China) |
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| Abstract: | Based on the intrinsic relationship between phase transition pressure and cohesive energy,a simple quantitative thermodynamic model is proposed to describe the size-dependence of phase transition pressure in nanocrystals.In terms of this model,the size effect of pressure-induced phase transition in GaAs nanocrystals is investigated.It is revealed that the stability of nanostructures drops leads to phase transition pressure reduces with size decreasing.As the size further decreases,the phase transition pressure decreases sharply and exhibits stronger size effect.The predicted results are consistent with MD simulations for GaAs nanocrystals reasonably. |
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| Keywords: | GaAs Nanocrystals pressure-induced phase transition size-model |
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