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

从岩石学上的小单晶建立收集数据的目的。商业差异计的圆圈是新设计的，并已成功工作。岩石学科学，pp59-66 4通过使用使用衍射仪，X射线数据是从相对层的孤立晶粒中收集的colly colly colly，并且有必要考虑隔离发病率。 …为了避免相邻谷物的额外反射光束，因此应使用量的射线。通过改变方向X射线和衍射X射线来收集单晶的X射线数据，但是，这些射线的方向非常非常 - 克服作家和他的同事在Rigaku Denki Journal中开发了一种方法允许DIFR作用的X射线的能量。对单个面积的射线进行计数。