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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 >Study of As - Se - Te glasses by neutron-, X-ray diffraction and optical spectroscopic methods
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Study of As - Se - Te glasses by neutron-, X-ray diffraction and optical spectroscopic methods

机译：中子，X射线衍射和光谱法研究As-Se-Te玻璃

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摘要

The atomic structures of amorphous As _(40)Se _(60-x)Te _x (x = 10 and 15) and As _(40)Se _(60) glasses have been investigated by neutron and high energy X-ray diffraction methods. The two datasets were modeled simultaneously by reverse Monte Carlo (RMC) simulation technique. The RMC simulations revealed a glassy network built-up from As(Se, Te) _3 pyramids in which Te atoms substitute Se atoms. The As - Se correlation function shows a strong and sharp first peak at 2.4 ? and two broad and much less intense peaks at 3.7 and 5.6 ?, related to 1st, 2nd and 3rd neighbor distances of the As - Se bonds, respectively. They are an evidence for existence of short and medium ordering in the studied glasses. The similarity of Θ_(Te - As - Te) and Θ _(Se - As - Se) bond distributions suggests that Te atoms have a similar role in the structure formation as Se atoms. The FTIR spectra analysis revealed impurity bonds of Se - H, As - O, Se - O, and Te - O in the glasses which contributed to enhanced absorption in visible spectral range. From the ellipsometric data analysis the optical constants and the energetic parameters of the studied glasses were established. The compositional variation of these parameters is explained in terms of chemical bonds formation and change in the density of charged defects.
机译：通过中子和高能X射线衍射研究了非晶态_（40）Se _（60-x）Te _x（x = 10和15）和As _（40）Se _（60）玻璃的原子结构方法。通过反向蒙特卡洛（RMC）模拟技术同时对两个数据集进行建模。 RMC模拟显示了由As（Se，Te）_3金字塔构成的玻璃状网络，其中Te原子替代了Se原子。 As-Se相关函数在2.4？以及在3.7和5.6？处的两个较宽且强度较小的峰，分别与As-Se键的第一，第二和第三相邻距离有关。它们是所研究眼镜中存在短和中等有序性的证据。 Θ_（Te-As-Te）和Θ_（Se-As-Se）键分布的相似性表明，Te原子在结构形成中的作用与Se原子相似。 FTIR光谱分析显示玻璃中的Se-H，As-O，Se-O和Te-O杂质键有助于提高可见光谱范围内的吸收。通过椭圆偏振数据分析，建立了所研究眼镜的光学常数和能量参数。这些参数的组成变化是根据化学键的形成和带电缺陷密度的变化来解释的。

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