Crystal lattice expansion of nanocrystalline materials

被引：74

作者：

Qin, W ^{[1
]}

Chen, ZH

Huang, PY

Zhuang, YH

机构：

[1] Cent S Univ Technol, Non Equilibrium Mat Res Inst, Changsha 410083, Hunan, Peoples R China

[2] Guangxi Univ, Inst Sci Mat, Nanning 530004, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1999年 / 292卷 / 1-2期

关键词：

crystal lattice expansion; stress field; nanocrystalline materials;

D O I：

10.1016/S0925-8388(99)00291-1

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Nanocrystalline materials are characterized structurally by ultra-fine crystallites separated by grain boundaries. The structure of nanocrystallites shows significant differences in comparison to perfect crystals. A model is proposed to account for the effects of the defects in the grain boundaries of nanocrystalline materials on the crystal lattice, based on the fact that the grain boundaries of nanocrystalline materials contain a large number of vacancies and vacancy clusters. A 1/x(3) law for the stress field caused by the vacancies and the vacancy clusters is considered, and the crystal lattice expansion of nanocrystalline materials is estimated. The theoretical results can interpret experimental observations well. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：230 / 232

页数：3

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