Appearance of regular and irregular structure in high energy collision field

本研究旨在通过高能粒子碰撞场中的原子重排，在金属表面或碳材料表面形成新型的纳米结构。本课题主要做了以下三个方面的研究工作：(1)我们报道了金、银和铜箔在低温电子辐照下通过自组织过程在电子存在表面形成纳米结构(材料学报43(2002)646)。在本研究中，发现经400keV电子辐照的镍和铁表面形成了新型的自组织结构。对铁箔进行了退火实验，发现它在823K以下是稳定的。(2)我们系统地研究了辐照引起的石墨非晶化，并提出了一个位错积累模型来解释非晶化过程(Phil.Meg.Lett.82(2002)401)。(3)我们用扫描电子显微镜和拉曼光谱研究了C_&lt；60&gt；富勒烯冲击压缩后恢复的样品。结果表明，回收样品的结构与离中心的距离有关。我们发现在回收的样品的内表面上产生了直径数μm的球形中空球(Chem.Phys.Lett.362(2002)47)。提出了球形中空粒子通过液体的生成机制(材料学报45(2004)5)。

The present study aims to generate new type of nano-structures on metal surface or carbon materials by atomic rearrangement in the high energy particle collision field. Three different kinds of research works have done in this project as described in the followings.(1)We have reported that nano-sized structures appear on the electron exist surface of gold, silver and copper foils by self-organization process under electron irradiation at low temperatures (Materials Transactions 43 (2002) 646). In the present study, new types of self-organized structures were found to be formed on nickel and iron surfaces irradiated with 400 keV electron. Annealing experiment was given to the iron foil and found to be stable up to 823 K.(2)We have systematically investigated the irradiation-induced amorphization of graphite and proposed a dislocation accumulation model to explain the amorphization process (Phil.Meg.Lett.82(2002)401).(3)We have investigated a recovered sample after shock-compression of C_<60> fullerene by means of scanning electron microscopy and Raman spectroscopy. It was shown that the structure of the recovered-sample depends on a distance from the center. We have found the generation of spherical hollow spheres of several μm in diameter on an internal surface of the recovered sample(Chem.Phys.Lett.362(2002)47). The generation mechanism of the spherical hollow particle through a liquid phase was proposed (Materials Transactions 45 (2004) 5).