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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 >Structure of (GeO2)(1-x)(PbO)(x) glasses by X-ray scattering
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Structure of (GeO2)(1-x)(PbO)(x) glasses by X-ray scattering

机译：（GeO2）（1-x）（PbO）（x）玻璃的X射线散射结构

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Glasses from the (GeO2)(1-x)(PbO)(x) system were synthesised and their structure was studied by X-ray scattering analysis. Simultaneously we have checked the relative Ge/Pb composition of the samples by the measurement of the Xray fluorescence spectra. In our analysis the radial electron density distribution curve as calculated from the X-ray scattering diagram showed several pronounced peaks. It was easy to ascribe the first peak at 1.75 Angstrom to Ge-O interactions, however the pair function analysis of the area was not able to discriminate between a model based on corner-bound tetrahedra Ge-O = 1.75 Angstrom and a model consisting of a mixture of corner-bound tetrahedra (Ge-O = 1.72) with corner-bound GeO6 octahedra (Ge-O = 1.88). The relation between octahedra and tetrahedra in the mixture model was (1:7). The second peak located at 2.43 Angstrom for x = 0.20 and at 2.40 Angstrom for x = 0.36 was simply ascribed to Pb-O interactions. The packing of PbO4 tetrahedra is relatively close and is characterised by a distorted tetrahedral co-ordination of O atoms by Pb atoms similar to that one found in the orthorhombic form of PbO (massicot) stable above 760 K. The pair function analysis of the radial electron distribution curves shows that the medium-range order structure may be interpreted so that parts of the GeO2-like structure formed by segments of GeO4 helices (alpha -quartz like) are interpenetrated by a PbO-like phase formed by parts of sheets/layers built of Pb atoms square-pyramidally bonded to four O atoms. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 19]
机译：合成了（GeO2）（1-x）（PbO）（x）系统的玻璃，并通过X射线散射分析研究了其结构。同时，我们通过测量X射线荧光光谱检查了样品的相对Ge / Pb组成。在我们的分析中，从X射线散射图计算出的径向电子密度分布曲线显示了几个明显的峰。容易将第一个峰在1.75埃处归因于Ge-O相互作用，但是该区域的对函数分析无法区分基于角结合四面体Ge-O = 1.75埃的模型和一个由角结合的四面体（Ge-O = 1.72）和角结合的GeO6八面体（Ge-O = 1.88）的混合物。混合模型中八面体和四面体之间的关系为（1：7）。 x = 0.20时位于2.43埃处，x = 0.36时位于2.40埃处的第二个峰简单地归因于Pb-O相互作用。 PbO4四面体的堆积相对较近，其特征是O原子被Pb原子扭曲的四面体配位，类似于在760 K以上稳定的PbO（马斯科特）的正交晶形式中发现的那种。径向的对函数分析电子分布曲线表明，可以解释中程有序结构，使得由GeO4螺旋段（α-石英）形成的GeO2类结构的一部分与由部分片/层形成的PbO类相互穿。由Pb原子方形金字塔形连接到四个O原子构成。 （C）2001 Elsevier Science B.V.保留所有权利。 [参考：19]

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