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Confined acoustic modes and spectral determination of network connectivity: Raman signatures of nanometric structure in g-GexSe1-x

机译:有限的声学模式和网络连通性的频谱确定:g-GexSe1-x中纳米结构的拉曼特征

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Low-temperature Raman scattering results are presented on three glass compositions of GexSe1-x (15, 20, and 27 At. Ge%), and conciled with their reported structural data. The acoustic range is marked by the absence of Boson peak, and features discrete modes corresponding to nanometric dynamic aggregates. First sharp diffraction peak (FSDP) in structure factor S(k), due to Ge-Ge correlations brought about by shared Ge[Se-1/2](4) tetrahedra medium-range structures, signifies 3D networking of Se-chains. A measure of volume-fraction of these entities determined from the FSDP area, and their number density rho(MRS) infinity (k(3) Area)(FSDP) is found to relate directly to the network connectivity, defined from optical Raman spectra in terms of the degree of cross-linking of Se-chains. (c) 2005 Elsevier Ltd. All rights reserved.
机译:低温拉曼散射结果显示在GexSe1-x的三种玻璃成分(15、20和27 At。Ge%)上,并与报道的结构数据相符。声学范围的特征在于不存在玻色子峰,并且具有与纳米动态聚集体相对应的离散模式。由于共享的Ge [Se-1 / 2](4)四面体中程结构带来的Ge-Ge相关性,结构因子S(k)中的第一个尖锐衍射峰(FSDP)表示Se链的3D网络。从FSDP区域确定的这些实体的体积分数的度量及其数密度rho(MRS)无穷大(k(3)区域)(FSDP)被发现与网络连通性直接相关,从光拉曼光谱中定义硒链交联度的术语。 (c)2005 Elsevier Ltd.保留所有权利。

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