摘要
纳米材料（NSM）是这样一类固体，其结构单元（大多为结晶体）至少在一个方向上具有数个纳米的特征尺寸按照结构单元的形状、化学成分可将其划分为12种类型．NsM的结构及性能不同于具相同化学成分的单晶体和玻璃．这种差别归因于品体尺寸的减少、品体形状（薄片、针和等轴）引起的维数效应以及结构单元之间界面的密度下降和配位数的变化本文讨论了支持上述观点的某些实验结果，描述了金属、大分子、半导体纳米材料的技术应用。
Nanostructured materials (NsM) are solids composed of structural elements-mostly crvstaltites-with a characteristic size (in at least one direction) of a few nanometers.NsM may be classified into twelve groups according to the shape and chemical com-position of their constituent structural elements. The atomic structu re and properties of NsM deviate from the ones of a single crystal and / or glass with the same chemical composition. This deviation results from the reduced size of the crystallites.dlmensionality effects due to the shape of the crystallites (thin plates. needles or equiaxed shape). and the reduced densitV and / or modified coordination numbers in the interfaces between the structural elements. Some of the experimental observations supporting these ideas are discussed. Technological applications of metallic .macromolecular and semiconducting NsM are described,
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1997年第2期165-174,共10页
Acta Metallurgica Sinica
关键词
界面
尺寸效应
结构
性能
纳米材料
nanostructured material. interface.size effect. structure and property
