同步辐射共聚焦XAFS的实验方法及应用
发布时间：2019-03-31 20:49
【摘要】：X射线吸收精细结构谱(X-ray Absorption Fine Structure,XAFS)能够提供待测元素的配位数、键长和价态结构信息等,且不依赖样品长程有序的晶体结构、对元素有选择性,是一种研究物质结构的重要手段,广泛应用于多学科领域,如能源、材料、环境、生物以及考古学等。通常,在X射线吸收精细结构谱学测量中,同步辐射的光斑大小在微米至毫米量级,样品为均一的样品。然而,在一些实际研究体系中,特别是文化遗产领域的研究中,样品珍贵、种类多样、其空间分布不均一而且复杂,亟需发展空间分辨的X射线吸收精细结构光谱,以便更准确表征在空间维度上的物质结构。本论文的主要工作是基于北京同步辐射光源,利用毛细管共聚焦方法,搭建了一套可移动的、深度分辨的、且适用于常规XAFS线站的微区共聚焦XAFS实验装置,用以拓展常规XAFS的实验方法。本论文的另一个重要工作为:共聚焦XAFS装置的应用研究。选择明代祭红陶瓷釉层作为研究对象,应用共聚焦XAFS无损探测呈色元素铜的价态在深度方向的演变规律,重新认识祭红呈色机制。
[Abstract]:X-ray absorption fine structure spectroscopy (X-ray Absorption Fine Structure,XAFS) can provide the coordination number, bond length and valence structure information of the elements to be measured, and does not depend on the long-range ordered crystal structure of the sample, so it has selectivity to elements. Is an important means to study material structure, widely used in multi-disciplinary fields, such as energy, materials, environment, biology, archaeology and so on. Generally, in X-ray absorption fine structure spectroscopy measurement, the spot size of synchrotron radiation is in the order of micron to millimeter, and the sample is homogeneous. However, in some practical research systems, especially in the field of cultural heritage, the samples are precious and diverse, and their spatial distribution is uneven and complex. It is urgent to develop space-resolved X-ray absorption fine structure spectra. In order to more accurately represent the spatial dimension of the physical structure. The main work of this paper is based on Beijing synchrotron radiation light source, using capillary confocal method, a set of mobile, depth-resolved, micro-confocal XAFS experimental equipment is built, which is suitable for conventional X-ray stations. It is used to expand the experimental method of conventional XAFS. Another important work of this thesis is the application of confocal XAFS device. By using confocal XAFS nondestructive detection of the valence state of copper in the depth direction of the red ceramic glaze of Ming Dynasty as the research object, the mechanism of the color rendering of the red worship was re-understood.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O434.1
本文编号：2451263
[Abstract]:X-ray absorption fine structure spectroscopy (X-ray Absorption Fine Structure,XAFS) can provide the coordination number, bond length and valence structure information of the elements to be measured, and does not depend on the long-range ordered crystal structure of the sample, so it has selectivity to elements. Is an important means to study material structure, widely used in multi-disciplinary fields, such as energy, materials, environment, biology, archaeology and so on. Generally, in X-ray absorption fine structure spectroscopy measurement, the spot size of synchrotron radiation is in the order of micron to millimeter, and the sample is homogeneous. However, in some practical research systems, especially in the field of cultural heritage, the samples are precious and diverse, and their spatial distribution is uneven and complex. It is urgent to develop space-resolved X-ray absorption fine structure spectra. In order to more accurately represent the spatial dimension of the physical structure. The main work of this paper is based on Beijing synchrotron radiation light source, using capillary confocal method, a set of mobile, depth-resolved, micro-confocal XAFS experimental equipment is built, which is suitable for conventional X-ray stations. It is used to expand the experimental method of conventional XAFS. Another important work of this thesis is the application of confocal XAFS device. By using confocal XAFS nondestructive detection of the valence state of copper in the depth direction of the red ceramic glaze of Ming Dynasty as the research object, the mechanism of the color rendering of the red worship was re-understood.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O434.1
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