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Morphological and Structural Studies on CVD-Diamand.

CVD 金刚石的形态和结构研究。

基本信息

批准号：
01460066
负责人：
OHSUMI Kazumasa
金额：
$ 4.03万
依托单位：
Photon Factory, National Laboratory For High Energy Physics
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

Diamond is considered to be an eligible materials for industrial use as well a candidate to clarify an origin of some kind of meteorite. The method to synthesize and grow it for industry has been developed based on the Chemical Vapor Deposition (CVD) technique. However, the sizes of the obtained diamonds by this method and from meteorite are not enough to be examined by an usual X-ray diffraction experiment and the details of the structure and/or texture have not been analyzed.On the other hand, we have developed the system to analyze the crystal structure of submicrometer-sized materials by using Synchrotron Radiation (SR) at the Photon Factory, KEK. The experiment using CVD diamond and SR, and its analysis are described below.An icosahedral CVD diamond among synthesized materials was picked up and examined by laue method with SR. More than 100 laue reflections were recorded on the imaging plate which is a detector instead of an X-ray film. Several Laue patterns of the sample were taken with an attenuator of molybdenum and of copper to change the spectrum of incident SR. The energy of Laue reflections were then found and these Laue reflections were indexed 111 or 220 of diamond lattice. These reflections were classified into each domain which constitute the icosahedron taking into account of crystal orientation of each domain. The relation of domains are found to be twin and the outer faces of the icosahedron are {111}.Further, an quantitative analysis of the profiles and intensities of Laue reflections is expected to clarify the details of texture and structure of each domain.

金刚石被认为是工业用途的合格材料，也是澄清某种陨石起源的候选材料。基于化学气相沉积（CVD）技术，发展了工业化合成和生长纳米晶的方法。然而，通过这种方法和陨石获得的金刚石的尺寸不足以通过通常的X射线衍射实验进行检查，并且结构和/或纹理的细节尚未分析。另一方面，我们开发了系统，通过使用同步辐射（SR）分析亚微米尺寸材料的晶体结构。本文叙述了CVD金刚石和SR的实验及其分析，在合成材料中选取了一种二十面体CVD金刚石，用SR进行Laue法检测，在代替X射线胶片的成像板上记录了100多个Laue反射。用钼和铜的衰减器改变入射SR的光谱，得到样品的几个劳厄图案，然后找到劳厄反射的能量，这些劳厄反射的指数为金刚石晶格的111或220。考虑到每个域的晶体取向，这些反射被分类到构成二十面体的每个域中。结果表明，畴间为孪晶关系，二十面体的外表面为{111}面，并对各畴的劳厄反射轮廓和强度进行了定量分析，以进一步阐明各畴的结构和织构细节。