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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Disorder in crystals of dioxofluorotungstates, (NH4)(2)WO2F4 and Rb2WO2F4
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Disorder in crystals of dioxofluorotungstates, (NH4)(2)WO2F4 and Rb2WO2F4

机译:二氧氟钨酸盐(NH4)(2)WO2F4和Rb2WO2F4的晶体失序

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摘要

Dioxotetrafluorotungstates (NH4)(2)WO2F4 [(I) at 297 K and (II) at 133 K] and Rb2WO2F4 (III) were synthesized in a single-crystal form and their structures were determined by Xray diffraction. Two independent states of the cis-WO2F4 octahedron are characteristic of static and dynamic disorder in structure (I). Dynamically disordered W2 is displaced from the symmetry axis producing four possible orientations of anion that permits O and F atoms to be identified in separate orientations owing to the inherent differences between W-O and W-F bonding. After the phase transition at lower temperature (201 K), (I) transforms into the twin structure (II) with complete O/F ordering. Structure (III) is characterized by full O/F static disorder without any phase transitions at lower temperature.
机译:以单晶形式合成了二氧四氟钨酸盐(NH4)(2)WO2F4 [(I)在297 K和(II)在133 K]和Rb2WO2F4(III),并通过X射线衍射确定了它们的结构。顺式-WO 2 F 4八面体的两个独立状态是结构(I)中静态和动态无序的特征。动态无序的W2从对称轴移开,产生四个可能的阴离子方向,由于W-O和W-F键之间的固有差异,允许O和F原子以不同的方向被识别。在较低温度(201 K)下进行相变后,(I)转变为具有完整O / F有序的孪晶结构(II)。结构(III)的特征在于完全的O / F静态无序,在较低温度下没有任何相变。

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