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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 >Connectivities of coordination polyhedra in phosphate glasses from P-31 double-quantum NMR spectroscopy
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Connectivities of coordination polyhedra in phosphate glasses from P-31 double-quantum NMR spectroscopy

机译：P-31双量子NMR光谱法测定磷酸盐玻璃中配位多面体的连接性

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摘要

High-resolution double-quantum nuclear magnetic resonance (NMR) spectroscopy in solids at a magnetic field of 11.75 T is applied to determine the structure of phosphate glasses. The connectivities between Q((n)) coordination polyhedra, identified by their P-31 chemical shifts are established. Moreover, more extended structural features, such as rings or linear chains composed of Q((2)) groups are resolved, since the chemical shift contains information about the local geometry, i.e. bond lengths and angles, which are in turn influenced by the surrounding Q((n)) groups. From the study of two sodium phosphate glasses, containing 35 and 58 mol% of Na2O a motif involving sequences of at least three Q((2)) groups could be identified in both compositions. Extensions of this new approach are discussed. (C) 1998 Elsevier Science B.V. [References: 31]
机译：固体在11.75 T磁场下的高分辨率双量子核磁共振（NMR）光谱用于确定磷酸盐玻璃的结构。建立Q（（n））配位多面体之间通过P-31化学位移确定的连接性。此外，解析了更多扩展的结构特征，例如由Q（（2））组组成的环或线性链，因为化学位移包含有关局部几何形状的信息，即键的长度和角度，而信息又受周围环境的影响Q（（n））个群组。从两个包含35和58 mol％Na2O的磷酸钠玻璃的研究中，可以在两种组合物中鉴定出涉及至少三个Q（（2））基团的序列的基序。讨论了这种新方法的扩展。 （C）1998 Elsevier Science B.V. [参考：31]

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