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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 >Intermediate-range order in glassy GexSe1-x around the stiffness transition composition
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Intermediate-range order in glassy GexSe1-x around the stiffness transition composition

机译：刚度过渡成分周围玻璃态GexSe1-x的中间范围顺序

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摘要

X-ray scattering measurements on glassy GexSe1-x were performed in a concentration range x = 0.07-0.333 in fine steps of 0.005-0.05, in order to explore the relation between the intermediate-range order (IRO) and the stiffness transition in this glassy system. The oscillations beyond the first peak around 20.5 nm(-1) in the structure factor, S(Q), remain almost unchanged or damp very slowly with decreasing the Ge concentration x, suggesting the preserve of the short-range order. On the other hand, the pre-peak around 10-12 nm(-1), indicating the existence of IRO, systematically changes with decreasing x; its Q position shifts towards the higher Q values and its area decreases. Especially near the onset of the stiffness transition, x = 0.20, the peak position starts to deviate from the linear relation. The origin of the pre-peak is discussed in connection with results of a recent anomalous X-ray scattering measurement indicating two contributions of Ge-Ge and Se-Se correlations. Around the onset composition of the stiffness transition, the area of the pre-peak associated with the Ge-Ge correlation has a plateau-like gradual decrease with x followed by a rapid decrease at x < 0.18, which is in good agreement with Raman data. (C) 2004 Elsevier B.V. All rights reserved.
机译：为了探索玻璃态GexSe1-x的X射线散射，其浓度范围x = 0.07-0.333，以0.005-0.05的精细步长进行了研究，目的是探索中间阶数（IRO）与刚度转变之间的关系。玻璃状系统。随着Ge浓度x的降低，结构因子S（Q）的第一个峰值附近的振荡超过20.5 nm（-1），几乎保持不变或非常缓慢地衰减，这表明保留了短程有序。另一方面，前峰值在10-12 nm（-1）附近，表明IRO的存在随着x的减小而系统地变化;它的Q位置移向更高的Q值，并且面积减小。特别是在刚度过渡开始时（x = 0.20），峰值位置开始偏离线性关系。结合最近的异常X射线散射测量结果讨论了峰前的起源，该结果表明Ge-Ge和Se-Se相关性有两个贡献。在刚度过渡的起始成分周围，与Ge-Ge相关的前峰面积随着x呈平台状逐渐减小，然后在x <0.18处迅速减小，这与拉曼数据非常吻合。 （C）2004 Elsevier B.V.保留所有权利。

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