摘要
本文研究了用高频溅射制备的纯Ｎｉ纳米晶体的晶格结构特征，利用Ｘ射线衍射技术精确测定了晶粒尺寸为６－１５ｎｍ的Ｎｉ纳米晶体的晶格常数．发现纳米晶体的晶格常数（ａ）均大于完整Ｎｉ单晶的平衡晶格常数（ａｏ），且ａ值随晶粒尺寸减小而显著增大，利用纳米晶体的热力学状态对这种晶格膨胀效应进行了解释．
The lattice structure of nanocrystalline pure Ni. prepared by high-frequency sputtering, has been investigated. The lattice parameter of nanocrystalline Ni samples with grain sizes ranging from 6 to 15 nm was measured accurately by X-ray diffraction. It was found that the lattice parameter(a) for the nanocrystallie samples is larger than that for the perfect Ni single crystal(ao), and the value of a increases significantly with the decrease of grain size. According to the thermodynamic theory, the lattice expansion in the nanocrystalline sample was explained.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1995年第2期A074-A078,共5页
Acta Metallurgica Sinica
基金
国家自然科学基金
中国科学院留学择优支持基金
院长特别基金
关键词
纳米晶体
晶格膨胀
纯镍
金属材料
nanocrystalline materials,lattice expansion, Ni, lattice parameter
