| 查看: 1515 | 回复: 2 | |||
[交流]
【讨论】关于energy dispersive X-ray diffraction(EDXRD)，能说多少说多少
|
| 关于这种测试方法，新吗？干什么的？等等等等，有多少写多少啊，论内容给分 |
回复此楼» 猜你喜欢
怎么看青基中了没有啊
已经有6人回复
-
国社科又开始会评了，不知道这次命运如何
已经有11人回复
-
售SCI一区文章，我:8.O.55.1.O.54,科目齐全,可伽急
已经有3人回复
-
售SCI文章，我:8O.5.5.1O.54,科目全,可十急
已经有3人回复
-
售SCI一区T0P文章，我:8O.55.1.O.54,科目全,可伽急
已经有3人回复
-
售SCI文章，我:8O.5.5.1O.54,科目全,可十急
已经有3人回复
-
有多少人是今天查系统知道结果的？
已经有19人回复
-
基金未中，这种答复是模板吗？
已经有7人回复
-
哪位高人中了，把查询到的截图贴出来让我看看，让我长长见识
已经有7人回复
-
面上意见出来了
已经有23人回复
» 抢金币啦！回帖就可以得到:
-
开心就散金
+5/1035
-
云南大学丁军桥团队2027年博士招生
+1/833
-
面上中了，散金币。
+5/820
-
基金高中！
+1/633
-
优质男征女友
+1/494
-
昆明理工大学智能车辆技术团队招聘博士后
+3/288
-
八年奋战，面上中了，同时一个读了8年的博士（中途接手）答辩通过了，都是涉险过关
+2/104
-
天平合规性问题
+1/98
-
【半导体薄膜代工】ALD/CVD/磁控溅射/热蒸发全工艺
+1/90
-
山东大学-山东字节信息智能技术实验室2026年招聘博士后
+2/26
-
广西大学作物学博士生招生
+2/20
-
哈尔滨工业大学（深圳）智能土木与海洋工程学院博士生招生
+3/17
-
招募博士后 — 北京清华-富士康纳米科技研究中心 (第一性原理)
+1/5
-
中国科学院广州生物医药与健康研究院课题组招收博士研究生1名（2027年9月入学）
+1/3
-
项目助理招聘启事
+1/2
-
多重蛋白检测定量技术赋能心血管疾病基础与转化研究
+1/2
-
中山大学可穿戴电路系统方向招2027届考核制博士生
+1/1
-
中山大学具身智能方向招2027届考核制博士生
+1/1
-
西安交通大学储能电催化团队诚招硕士/博士研究生
+1/1
-
抗体筛选研发岗位
+1/1
2楼2010-12-13 19:44:59
★
小木虫: 金币+0.5, 给个红包，谢谢回帖
小木虫: 金币+0.5, 给个红包，谢谢回帖
|
The fundamental idea of using in situ EDXRD with a polychromatic X-ray source and an energy-discriminating detector for rapid obtention of diffractograms was first suggested over 35 years ago (Giessen and Gordon, 1968), and the potential for utilisation of synchrotron radiation in EDXRD studies was noted not long afterwards (Buras et al., 1976). However, it is only with more recent improvements in synchrotron X-ray sources and detectors, providing greatly improved signal-to-noise ratios and therefore time and d-spacing resolution (Walton and O’Hare,2000), that EDXRD has become a technique of real importance. Where standard (angle-dispersive) XRD uses a monochromatic beam with a detector scanning over a range of angles, the polychromatic(‘white’) X-ray beam used in EDXRD allows the use Bragg’s Law, Eq. (1), the diffracted beams from structures with different d-spacings are distinguished by different values of for a fixed , rather than via variation in as in regular XRD:n = 2d sin . (1)EDXRD is of particular use in the investigation of hydrothermal reaction processes, which require sample vessels capable of withstanding relatively aggressive chemical environments (Heet al., 1992; Evans et al., 1995). The much greater penetrating power of the polychromatic wiggler-source X-ray beamused here compared to a monochromated bending-magnet beam enables the use of ‘laboratory-sized’ sample cells in transmission geometry, thereby greatly simplifying experimental design and expanding the available parameter space. The removal of the need to scan the detector across a range of angles also decreases the collection time required to obtain a diffractogram, and is not subject to several of the difficulties inherent in the use of an image plate detector, which is the other common way of avoiding this problem when rapid diffractogram acquisition is required (Chupas et al., 2003). Some spatial resolution is sacrificed by use of the energy-discriminating detector when compared to angle-dispersive synchrotron XRD, but this is quite acceptable in the context of the current investigation, which is dealing with X-ray amorphous materials meaning that all peaks observed are very broad regardless of the detector used. of an energy-discriminating detector fixed at a given angle. |
3楼2018-05-16 21:25:19
