Morphological and Structural Studies on CVD-Diamand.

钻石被认为是一种符合工业用途的材料，也是确定某种陨石来源的候选材料。在化学气相沉积(CVD)技术的基础上，发展了一种工业化合成和生长它的方法。然而，通过这种方法和从陨石中获得的钻石的尺寸不足以用常规的X射线衍射实验来检验，并且没有对结构和/或织构的细节进行分析。另一方面，我们在KEK的光子工厂开发了利用同步辐射(SR)来分析亚微米材料的晶体结构的系统。利用CVD金刚石和SR进行了实验，并进行了分析。从合成材料中提取了一种二十面体CVD金刚石，并用SR劳厄法对其进行了检测。成像板上记录了100多个劳厄反射，这是一个探测器，而不是X射线胶片。用钼和铜的衰减器获取样品的几种劳厄模式，以改变入射SR的光谱。然后找到了劳厄反射的能量，这些劳厄反射被折射率为111或220的钻石晶格。这些反射被分类到每个区域，考虑到每个区域的晶体取向，这些区域构成了二十面体。研究发现，磁区之间为孪生关系，二十面体的外表面为{111}。此外，对Laue反射的轮廓和强度的定量分析有望阐明每个磁区的织构和结构细节。

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.