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Cation ordering at fluoride sites in silicate glasses: a high-resolution F-19 NMR study

机译:硅酸盐玻璃中氟化物位点的阳离子有序:高分辨率F-19 NMR研究

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摘要

High-resolution F-19 NMR, with sample spinning rates to 25 kHz, can provide quantitative, new information about the structure of fluoride sites in F-doped silicate glasses. Here we present results for sodium-, potassium-, calcium-, lanthanum- and mixed cation silicate glasses, containing 1-2 wt% F. In the end member compositions, most fluoride is in sites that are structurally similar to the corresponding simple metal fluoride, although a few percent of Si-F bonds can be detected in the sodium silicates. In the mixed cation glasses, partially resolved peaks are observed for series of distinct mixed cation coordination environments for fluoride. Fluoride ions seem to be preferentially bonded to higher field-strength modifier cations, but considerable disorder is present for all cation pairs (Na-K, Na-Ca, Na-La) studied. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 13]
机译:样品旋转速率高达25 kHz的高分辨率F-19 NMR可以提供有关F掺杂硅酸盐玻璃中氟化物位点结构的定量新信息。在这里,我们介绍了含有1-2 wt%F的钠,钾,钙,镧和混合阳离子硅酸盐玻璃的结果。在端部组成中,大多数氟化物的位置与相应的简单金属相似尽管可以在硅酸钠中检测到百分之几的Si-F键,但氟化物仍然是氟化物。在混合阳离子玻璃中,对于一系列独特的氟化物混合阳离子配位环境,观察到部分分解的峰。氟离子似乎优先与较高场强的改性剂阳离子键合,但是对于所有研究的阳离子对(Na-K​​,Na-Ca,Na-La)都存在相当大的无序性。 (C)2000 Elsevier Science B.V.保留所有权利。 [参考:13]

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