| 查看: 1371 | 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
拟解决的关键科学问题还要不要写
已经有8人回复
-
最失望的一年
已经有14人回复
-
求助一下有机合成大神
已经有3人回复
-
存款400万可以在学校里躺平吗
已经有30人回复
-
求推荐英文EI期刊
已经有5人回复
-
请教限项目规定
已经有4人回复
-
26申博
已经有3人回复
-
基金委咋了？2026年的指南还没有出来？
已经有10人回复
-
基金申报
已经有6人回复
-
疑惑？
已经有5人回复
» 抢金币啦！回帖就可以得到:
-
南京大学能源与资源学院-景旭东教授 (英国皇家工程院院士) 团队博士后招聘
+1/473
-
浙江师范大学招收大气遥感、光学或人工智能方向的2026年物理学博士生1名
+2/280
-
上海87年GG诚求女友
+1/172
-
大连理工大学智能系统实验室优秀硕博研究生招生
+1/82
-
深圳大学水科学中心HydroS课题组招收化学/环境相关专业博士生1名（2026年入学）
+1/81
-
扬州大学王赪胤教授课题组 2026级博硕士研究生生招生（电化学储能 / 光催化方向）
+1/76
-
中国地质大学（武汉）地质学、地质资源与地质工程、资源与环境方向招生，请尽快联系！
+1/70
-
中国科学院杭州医学研究所方晓红课题组-上海交通大学肖泽宇课题组联合博士后招聘启示
+2/42
-
国重点实验室双一流A类长江学者团队招2026年全日制博士1-2名
+2/34
-
[长期合作招募] 同济大学肖倩老师团队诚邀港澳学者学术交流
+1/34
-
上海交通大学 碳纳米管、阵列、器件应用博士后招聘
+1/34
-
智合健物课题组2026年博士生招生(湖北工业大学)
+1/31
-
沈阳征女友
+1/26
-
93年坐标北京，征女友
+1/19
-
2026申博自荐 本硕双一流学科 纳米药物递送方向 一篇一区TOP 两个国家奖学金
+1/14
-
北京工业大学高靓教授课题组2026级博士研究生招生
+1/9
-
2026 年南方医科大学基础医学院李琳课题组招收“申请-审核” 博士研究生
+1/5
-
福州大学梁宇航副教授招收2026年申核制博士研究生/硕士研究生（理论计算方向）
+1/2
-
福州大学梁宇航副教授招收2026年申核制博士研究生/硕士研究生（理论计算方向）
+1/1
-
河北工业大学层状材料与器件团队诚聘 二维材料与原位电子显微学方向青年教师与博士后
+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