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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 >Ring size distribution in silicate glasses revealed by neutron scattering first sharp diffraction peak analysis
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Ring size distribution in silicate glasses revealed by neutron scattering first sharp diffraction peak analysis

机译：中子散射第一尖锐衍射峰分析显示硅酸盐玻璃中的铃声尺寸分布

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摘要

Silicate glasses have no long range order and a short range order similar to their crystalline counter-parts. Therefore, their key structurally distinct information lies in the medium range. The statistics of rings, describing the 3D connection of tetrahedral units, is a crucial indicator of the medium range structure. However, no experimental techniques have succeeded in quantifying the ring statistics. Here we show a heuristic method to extract ring structure information from the first sharp diffraction peak (FSDP) of the neutron scattering structure factor. We demonstrate that, for 81 commercially important silicate glasses, the real space representation I(r)-s of their FSDPs, can be consistently represented by a sum of three compressed exponentially decaying sine functions with three fixed periodicities. We propose these three characteristic periodicities are commensurate with the statistically averaged sizes of 5_ 4-, 5- and 6-membered rings, with their relative amplitudes reflecting the relative fractions. Our results are validated using Molecular Dynamics simulated glass structures. The derived ring structure information provides an insight into the structural origin of the anomaly in hardness of aluminosilicate glasses.
机译：硅酸盐眼镜没有长距离秩序和与其晶体反应部件类似的短距离顺序。因此，它们的关键结构不同的信息位于中等范围内。环的统计数据，描述四面体单元的3D连接，是中范围结构的关键指标。然而，没有实验技术成功地量化环统计。在这里，我们示出了一种提取来自中子散射结构因子的第一尖锐衍射峰（FSDP）的环形结构信息的启发式方法。我们证明，对于81个商业上重要的硅酸盐玻璃，其FSDP的实际空间表示I（R）-S -S可以始终如一地表示，这三个压缩指数衰减正弦函数具有三个固定周期。我们提出这三种特征周期性与统计上平均尺寸的5_4-，5-和6元环的尺寸相称，其相对幅度反映了相对级分。我们的结果是使用分子动力学模拟玻璃结构进行验证的。衍生的环结构信息提供了对硅铝酸盐玻璃硬度的异常的结构起源的洞察力。

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