Morphological and Structural Studies on CVD-Diamand.

钻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。在化学气相沉积（CVD）技术的基础上，开发了用于工业的合成和生长方法。然而，用这种方法和从陨石中获得的钻石的尺寸不足以用通常的x射线衍射实验来检查，并且没有分析结构和/或纹理的细节。另一方面，我们在光子工厂KEK开发了利用同步辐射（SR）分析亚微米尺寸材料晶体结构的系统。用CVD金刚石和SR进行实验，并对其进行分析。用劳法对合成材料中的二十面体CVD金刚石进行了扫描，在代替x射线片的探测器成像板上记录了100多次劳反射。用钼和铜的衰减器改变了入射锶的光谱，得到了样品的劳厄图，这些劳厄反射的能量是金刚石晶格的111或220。考虑到每个区域的晶体取向，将这些反射波划分为构成二十面体的各个区域。结构域的关系是孪生的，二十面体的外表面为{111}。此外，对劳厄反射剖面和强度的定量分析有望阐明每个域的纹理和结构细节。

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.