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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 potassium germanophosphate glasses by X-ray and neutron diffraction: 2. Medium-range order
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Structure of potassium germanophosphate glasses by X-ray and neutron diffraction: 2. Medium-range order

机译：X射线和中子衍射的锗磷酸钾玻璃的结构：2.中程级

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Characteristics of the medium-range order (MRO) of K2O-GeO2-P2O5 (KGP) glasses are obtained from Xray and neutron scattering data. The behavior of the MRO is expressed in changes of pre-peaks and smooth contributions in the structure factors, S(Q), for Q < 12 nm(-1). Peaks at Q = (7.5 +/- 0.5) nm(-1) (Q - magnitude of the scattering vector) are the outstanding features and reach maximum intensity for a glass of similar to 25/50/25 mol% K2O/GeO2/P2O5. The pre-peaks are explained by a structural model in which K-rich and Ge-rich regions are separated by PO4 units. The distance of repetition of similar regions (similar to 1 nm) is responsible for the pre-peak at similar to 7.5 nm(-1). The intensity of this pre-peak is reduced and finally eliminated for glass compositions approaching the binary GeO2-P2O5 system. The pre-peak is changed to a smooth scattering contribution and finally shifted to similar to 9 nm(-1) for glass compositions approaching the binary K2O-GeO2 system. The strong tendency of the PO4 units to coordinate K+ and Ge neighbors at their four corners is the source for the special MRO of the KGP glasses. (c) 2008 Elsevier B.V. All rights reserved.
机译：从X射线和中子散射数据获得K2O-GeO2-P2O5（KGP）玻璃的中程量级（MRO）特性。对于Q <12 nm（-1），MRO的行为表示为峰前变化和结构因子S（Q）的平滑贡献。 Q =（7.5 +/- 0.5）nm（-1）（Q-散射矢量的大小）处的峰是突出的特征，并达到了类似于25/50/25 mol％K2O / GeO2 /的玻璃的最大强度P2O5。通过结构模型解释峰前，其中富钾和富锗区域被PO4单元分隔。相似区域（相似于1 nm）的重复距离是造成峰前相似于7.5 nm（-1）的原因。对于接近二元GeO2-P2O5体系的玻璃组合物，此峰前的强度会降低，最终消除。对于接近二元K2O-GeO2系统的玻璃组合物，将预峰更改为平滑的散射贡献，最后移至类似于9 nm（-1）。 PO4单元在四个角协调K +和Ge邻居的强烈趋势是KGP眼镜特殊MRO的来源。 （c）2008 Elsevier B.V.保留所有权利。

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