纯镍纳米晶体的晶格膨胀  

LATTICE EXPANSION IN NANOCRYSTALLINE PURE Ni

作　　者：卢柯[1] 刘学东[1] 张皓月[1] 胡壮麒[1] 

机构地区：[1]中国科学院金属研究所快速凝固非平衡合金实验室

出　　处：《金属学报》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

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.

关 键 词：纳米晶体 晶格膨胀 纯镍 金属材料 

分 类 号：TG146.15[一般工业技术—材料科学与工程]