Ar^+离子束轰击在石墨表面形成六方金刚石纳米晶的研究  

STUDIES OF HEXAGONAL DIAMOND OF NANO-GRAIN IN GRAPHITE SURFACE PRODUCED BY Ar^+ ION BOMBARDMENT 

作　　者：王震遐[1] 俞国庆[1] 阮美龄[2] 朱福英[1] 朱德彰[1] 潘浩昌[1] 徐洪杰[1] 

机构地区：[1]中国科学院上海原子核研究所,上海201800 [2]中国科学院上海硅酸盐研究所,上海200050

出　　处：《物理学报》2000年第8期1524-1527,共4页Acta Physica Sinica

基　　金：国家自然科学基金重点项目!(批准号:19735004);中国科学院重点项目!(批准号:KJ952J1414)资助的课题

摘　　要：在 0 .6keVAr+高剂量 (～ 10 2 2 /cm2 )辐照石墨表面 ,借助于高分辨透射电子显微镜 (HRTEM ) ,发现有六方金刚石纳米晶产生 .它们的平均直径介于 1— 5 0nm之间 ,而且晶粒个数约随其直径的增大而直线减少 .有趣的是 ,晶粒具有两种结构模式 :直径小于 10nm的晶粒为单晶结构 ,而直径大于 10nm的为多晶结构 .基于受离子轰击过程特点制约的六方金刚石晶粒成核和成长观点 。Hexagonal diamond nano\|grains in irradiated surface of graphite produced by ion bombardment at high doses of 0.6?keV Ar\++ have been found,using high\|resolution transmission electron microscopy (HRTEM).The average diameter ( D ) of the grains was varied between ～2 and ～50?nm,and the grain population decreases almost monotonic ally as grain size increases.It is of interest to note that they exhibit a distinctly bimodal structure.For diameters less than 10?nm,the microstructure of grains are single crystals,but the polycrystal structure of nano\|grains with larger diameter (>10?nm) can be also observed.The characteristics of this bimodal structure are on the basis of hexagonal diamond nano\|grain nucleation and growth mechanisms,which are restricted by the characteristics of ion bombardment processes.

关 键 词：离子轰击 六方金刚石纳米晶 氩离子 石墨 表面 

分 类 号：O7[理学—晶体学]