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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Local structure around lead, barium and strontium in waste cathode-ray tube glasses
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Local structure around lead, barium and strontium in waste cathode-ray tube glasses

机译：阴极射线管废玻璃中铅，钡和锶周围的局部结构

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摘要

Cathode-ray tubes (CRTs) are made of two different kinds of glasses. The front part, panel, or screen, is made of barium- and strontium-containing glasses, while the rear part, the funnel, is made of lead-containing glasses. The structure and the role of these elements in the glasses are different: lead oxide is generally considered as a network intermediate whereas barium and strontium oxides as network modifiers. To study the local structure around the three aforementioned heavy elements we have used X-ray absorption spectroscopy (XAFS) on Ph and Ba L-III-edges and Sr K-edge as well as X-ray photoemission spectroscopy (XPS) analyzing the Pb4f, Sr3p, Ba3d, Si2p and O 1s core peaks. Due to the complex formulation of these glasses the coordination of lead and strontium could be affected compared with the local structure of binary glassy systems. We demonstrate that the average coordination number of lead is close to three (Pb-O distances being 2.24 angstrom) as in other lead silicate glasses. In case of strontium, the coordination number is found close to five (Sr-O distances being 2.52 angstrom) similar to that in Sr-containing glasses. (c) 2007 Elsevier B.V. All rights reserved.
机译：阴极射线管（CRT）由两种不同的眼镜制成。前部，面板或屏幕由含钡和锶的玻璃制成，而漏斗的后部由含铅的玻璃制成。这些元素在玻璃中的结构和作用是不同的：氧化铅通常被认为是网络中间体，而钡和锶的氧化物则被认为是网络改性剂。为了研究上述三个重元素周围的局部结构，我们使用了在Ph和Ba L-III边缘和Sr K边缘上的X射线吸收光谱（XAFS）以及分析Pb4f的X射线光发射光谱（XPS） ，Sr3p，B​​a3d，Si2p和O 1s核心峰。由于这些玻璃的复杂配方，与二元玻璃态系统的局部结构相比，铅和锶的配位会受到影响。我们证明，与其他硅酸铅玻璃相比，铅的平均配位数接近三（Pb-O距离为2.24埃）。在锶的情况下，与含Sr的玻璃相似，发现其配位数接近5（Sr-O距离为2.52埃）。 （c）2007 Elsevier B.V.保留所有权利。

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