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首页> 外文期刊>IUCrJ >Synthesis of new Ln4(Al2O6F2)O2 (Ln = Sm, Eu, Gd) phases with a cuspidine-related structure
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Synthesis of new Ln4(Al2O6F2)O2 (Ln = Sm, Eu, Gd) phases with a cuspidine-related structure

机译：具有cuspidine相关结构的新Ln4（Al2O6F2）O2（Ln = Sm，Eu，Gd）相的合成

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摘要

The first fluorination of the cuspidine-related phases of Ln4(Al2O7□)O2 (where Ln = Sm, Eu, Gd) is reported. A low-temperature reaction with poly(vinyl­idene difluoride) lead to the fluorine being substituted in place of oxygen and inserted into the vacant position between the dialuminate groups. X-ray photoelectron spectroscopy shows the presence of the F 1s photoelectron together with an increase in Al 2p and rare-earth 4d binding energies supporting F incorporation. Energy-dispersive X-ray spectroscopy analyses are consistent with the formula Ln4(Al2O6F2)O2, confirming that substitution of one oxygen by two fluoride atoms has been achieved. Rietveld refinements show an expansion in the cell upon fluorination and confirm that the incorporation of fluoride in the Ln4(Al2O7□)O2 structure results in changes in Al coordination from four to five. Thus, the isolated tetrahedral dialuminate Al2O7 groups are converted to chains of distorted square-based pyramids. These structural results are also discussed based on Raman spectra.
机译：据报道，Ln4（Al2O7□）O2（其中Ln = Sm，Eu，Gd）与库斯匹定相关的相首次氟化。与聚偏二氟乙烯的低温反应导致氟代替氧而被取代，并被插入到二烯丙基之间的空位。 X射线光电子能谱显示F 1s光电子的存在以及Al 2p和稀土4d结合能的增加，从而支持F的结合。能量色散X射线光谱分析与分子式Ln4（Al2O6F2）O2一致，证实已实现一个氧被两个氟原子取代。 Rietveld的精炼显示出氟化作用后电池中的膨胀，并证实氟化物在Ln4（Al2O7□）O2结构中的掺入会导致Al配位从4变为5。因此，分离出的四面体二铝基Al 2 O 7基团被转化为扭曲的基于正方形的金字塔的链。还基于拉曼光谱讨论了这些结构结果。

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