High Pressure Diffraction Using Synchrotron Radiation
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摘要: 同步辐射光源具有宽光谱、高亮度、高准直等优异性能，被广泛地用于高压科学研究。在依托同步辐射光源所发展的诸多高压研究手段中，X射线衍射是最基本的也是应用最多的实验技术之一。本文简单介绍了同步辐射光的独特性能和光源的基本构成，以及同步辐射光束线和实验站的基本概念。针对基于金刚石对顶砧（DAC）的高压X射线衍射技术，阐述了多种测试方法的原理和应用，包括粉末衍射、单晶衍射、多晶衍射、径向衍射、激光加温衍射以及快速加载衍射等。对北京同步辐射装置（BSRF）4W2高压衍射线站所提供的同步辐射光品质、X射线微聚焦能力、多种衍射方法以及新近发展的实验技术进行了较详细的描述，并展望了高能同步辐射光源（HEPS）的建设给高压科学研究带来的机遇。Abstract: Synchrotron radiation source can offer wide-spectrum, high-energy, high-brightness, and low-emittance, which has been widely used in high pressure research. Among the X-ray techniques, the X-ray diffraction is one of the most basic and widely used experimental techniques, and is likely to remain the dominant application for high-pressure research in the future. Here the unique properties of synchrotron radiation, the basic composition of the light source, and the concepts of beam lines and experimental stations are briefly introduced. The high-pressure X-ray diffraction based on diamond anvil cells is focused. Various diffraction methods are explained, including powder diffraction, single X-ray diffraction and radial X-ray diffraction, as well as the combination with the laser heating and fast loading techniques. The equipment configuration and the capabilities of the high-pressure beamline at the Beijing Synchrotron Radiation Facility (BSRF) are also described, including the quality of radiation from 4W2 wiggler, X-ray micro-focusing, various diffraction methods and newly developed techniques. At last the opportunities brought by the construction of High Energy Photon Source (HEPS) for high pressure research are prospected.
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Key words:
- high pressure /
- X-ray diffraction /
- synchrotron radiation /
- diamond anvil cell
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图 1 同步辐射产生原理和光源结构
Figure 1. Schematic diagram of synchrotron radiation and light source structure
图 3 接近光速的电子偏转运动时产生辐射的角发散
Figure 3. Radiation angular divergence of relativistic electron in circular motion
图 11 DAC样品在单轴加载下的应力状态
Figure 11. Stress state of the sample in the DAC under uniaxial loading
图 13 采用EDXD模式的DAC径向衍射几何示意图
Figure 13. Schematic geometry of DAC radial diffraction using EDXD technique
图 14 角色散径向衍射几何示意图
Figure 14. Schematic geometry of DAC radial diffraction using ADXD technique
图 19 4W2高压线站衍射系统照片
Figure 19. Photographs of high pressure diffraction apparatus with interchangeable detectors
图 20 单晶实验中的X射线、样品腔和样品
Figure 20. X-ray spot, sample and sample chamber in single crystal experiment
图 21 用于高压单晶XRD的HPSXD程序界面
Figure 21. Program interface of HPSXD for high pressure single crystal XRD
图 22 Bohler-Almax型压砧和WC支撑座的装配
Figure 22. Bohler-Almax diamond and assembly with WC seat
图 23 4W2线站EDXD模式DAC径向衍射系统：（a）
$\psi $ = 0°，（b）$\psi $ = 90°Figure 23. Photographs of DAC radial diffraction system using EDXD technique at 4W2 station：（a）
$\psi $ = 0°，（b）$\psi $ = 90°
图 24 4W2线站DAC径向衍射系统（ADXD模式）：（a）衍射几何示意图，（b）系统实物照片
Figure 24. Schematic geometry （a） and photographs （b） of DAC radial diffraction system using ADXD technique at 4W2 station
图 25 4W2线站用于高压衍射的双面激光加温系统
Figure 25. Double-sided laser heating system for high pressure diffraction at 4W2 station
图 26 TiO2和Mg2SiO4在激光加温实验过程中温度的变化
Figure 26. Temperature stabilities of TiO2 and Mg2SiO4 during the laser heating experiment
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