Crystal lattice expansion of nanocrystalline materials
1999; Elsevier BV; Volume: 292; Issue: 1-2 Linguagem: Inglês
10.1016/s0925-8388(99)00291-1
ISSN1873-4669
AutoresWen Qin, Z.H Chen, P. Huang, Yuxuan Zhuang,
Tópico(s)Advanced ceramic materials synthesis
ResumoNanocrystalline 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/x3 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.
Referência(s)