Development of x-ray diffractometer for petrographic thin section

岩相薄片X射线衍射仪的研制

基本信息

批准号：
17540459
负责人：
TOKONAMI Masayasu
金额：
$ 1.73万
依托单位：
Saitama Institute of Technology (SIT for short)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17540459/
关键词：
x-ray diffraction single crystal white x-rays olarized microscope collimator x-ray guide tube 白色X線偏光顕微鏡

项目摘要

The purpose of this investigation is to establish a method of a collection of x-ray diffraction data from a small single crystal on the petrographic thin section which has been examined precisely under the optical microscope.In 2005, the collimator by which incident x-rays were focused on the common center or phi- and chi-circle of a comercial diffractometer was newly designed and has been confirmed to work successfully.In 2006, the x-ray diffraction data from a small grain of an alkali amphibole crystal on the thin section of nepheime syenite from Pocos de Caldas, Brazil, which was described in Journal of Mineralogical and Petrological Sciences, vol.99, pp59-66, 2004 by us were collected using the above mentioned diffractometer eauipped the collimator.X-ray data are usually collected from an isolated grain of the relevant material and it is not necessary to consider the breadth of the incident rays. However, the grain on the thin section is not isolated but has the neighboring crystal … More grains around it. In order to avoid the extra reflected beams from the neighboring grains, focused rays should be utilized. For this reason, a collimator has been made using a flexible silica-glass tube of 0.2mm φ and has been tuned to focus the concerning specimen.In usual case, a whole set of the x-ray diffraction data of a single crystal is collected by varying the directions or tne inciaent x-rays and the diffracted x-rays. In the present case, however, the directions of those rays are very restricted because the slide glass under the specimen prohibits the propagation of the x-rays. To overcome the restrictions one of the writer and his coworkers developed a method which was described in Rigaku Denki Journal, Vol.25, Part1, pp3-9 (1994). According to this method, the white x-ray having the continuous energy spectra as the incident rays and the solid state detector which was enable to resolve the energy of the diffracted x-rays. The measured range in the reciprocal space was selected to the inside of a cone of which axis was normal to the surface of the thin section and its vertical angle was 21 degrees. The range was divided to 12,227 small areas and the diffracted x-rays from individual area were counted. 1540 significant diffracted intensities from relevant areas were obtained. Very large stress field seemed to remain in the crystals on thin section. The analysis of the measured data should be performed in near future Less

这项研究的目的是建立一种方法，是从岩石学薄部分上的一个小单晶的收集X射线衍射数据的方法，该数据已在光学显微镜下进行了精确检查，该方法已在光学显微镜下进行了精确检查。在2005年，IN X射线被X射线集中在公共中心或普通中心或phi-和Phi-cird和Chi-cird上的较小的社交衍射仪，并从事了纽约的数据。来自巴西Pocos de Caldas的肾含量薄片上的碱性闪石晶体的颗粒，在《矿物学和岩石学杂志》中进行了描述，第99卷，第99-66页，第2004卷，2004年，使用上述衍生仪的插件，与毛茸茸的数据相关。事件射线的广度。但是，薄截面上的谷物不是孤立的，而是邻近的晶体……周围更多的谷物。为了避免来自相邻晶粒的额外反射光束，应使用聚焦射线。因此，已经使用0.2mmφ的柔性二氧化硅玻璃管制成了直接仪，并已调谐以聚焦有关样品。在通常的情况下，通过改变方向或tne cormiar x射线和差异X射线来收集单个晶体的整个X射线衍射数据。但是，在当前情况下，这些射线的方向非常受限制，因为标本下的滑动玻璃禁止X射线传播。为了克服限制，作者和他的同事开发了一种方法，该方法在Rigaku Denki Journal，第25卷，第1部分，PP3-9（1994）中进行了描述。根据这种方法，作为入射射线和固态检测器，具有连续能光谱的白色X射线选择了互相空间中测得的范围，然后选择轴的内部，其轴的圆锥体的内部与薄截面的表面正常，其垂直角度为21度。该范围分为12,227个小区域，并计数来自各个区域的衍射X射线。获得了1540个来自相关区域的显着衍射实例。在薄截面的晶体中似乎保留了很大的应力场。测量数据的分析应在不久的将来进行