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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >An in situ spectroscopic study of the local structure of oxyfluoride melts: NMR insights into the speciation in molten LiF-LaF3-Li2O systems
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An in situ spectroscopic study of the local structure of oxyfluoride melts: NMR insights into the speciation in molten LiF-LaF3-Li2O systems

机译：氟氧化物熔体局部结构的原位光谱研究：NMR洞悉LiF-LaF3-Li2O熔融体系中的形态

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The local structure of molten LaF3-LiF-Li2O has been investigated by high temperature NMR spectroscopy. The La-139 and F-19 chemical shifts have been measured as a function of temperature and composition. The NMR spectra show that Li2O reacts completely with LaF3 to form a LaOF compound in the solid state below the melting temperature of the sample. LaOF is not completely dissolved in the fluoride melt and solid LaOF is observed in the F-19 spectra for Li2O concentrations above 10 mol%. We discuss the local environment of lanthanum ions in molten LaF3-LiF-Li2O and compare the results to those with the LaF3-LiF-CaO system. The analysis of the temperature and Li2O concentration dependences of the La-139 and F-19 chemical shifts suggests that several kinds of lanthanum oxyfluoride long-lived LaOxFy3-x-y units are present in the melt.
机译：熔融LaF3-LiF-Li2O的局部结构已通过高温NMR光谱进行了研究。已测量了La-139和F-19的化学位移与温度和组成的关系。 NMR光谱显示Li2O与LaF3完全反应，在低于样品熔融温度的固态下形成LaOF化合物。 LaOF不能完全溶解在氟化物熔体中，并且在F-19光谱中，对于浓度高于10 mol％的Li2O，可以观察到固体LaOF。我们讨论了熔融LaF3-LiF-Li2O中镧离子的局部环境，并将结果与​​LaF3-LiF-CaO系统的结果进行了比较。对La-139和F-19化学位移的温度和Li2O浓度依赖性的分析表明，熔体中存在多种类型的氟氧化镧长寿命LaOxFy3-x-y单元。

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