Lattice distortion and its effects on physical properties of nanostructured materials
Lattice distortion and its effects on physical properties of nanostructured materials
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DOI：
10.1088/0953-8984/19/23/236217
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发表时间：
2007-05
期刊：
影响因子：
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通讯作者：
W. Qin;T. Nagase;Y. Umakoshi;J. Szpunar
中科院分区：
文献类型：
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作者：
W. Qin;T. Nagase;Y. Umakoshi;J. Szpunar
建立了一个理论模型来理解纳米结构材料中晶格偏离完美结构的基本机理。界面张力和晶界内多余体积引起的应力场是导致晶格畸变的两个主要原因。基于该模型，定量分析了晶格畸变对纳米结构材料热膨胀系数的贡献。结果表明，纳米结构材料的不同寻常的物理性质不仅与晶界有关，还与纳米晶体有关。
A theoretical model is developed to understand the basic mechanism of the deviation of a crystal lattice from the perfect structure in nanostructured materials. The interface tension and the stress field induced by the excess volume in the grain boundaries are the two main reasons for lattice distortion. Based on this model, the contribution of the lattice distortion to the thermal expansion coefficient of nanostructured materials is analysed quantitatively. The results show that the unusual physical properties of nanostructured materials result not only from grain boundaries, but also from nanocrystallites.