STRUCTURAL STUDY OF A NEW HEXAGONAL FORM OF TUNGSTEN TRIOXIDE
STRUCTURAL STUDY OF A NEW HEXAGONAL FORM OF TUNGSTEN TRIOXIDE
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DOI：
10.1016/0022-4596(79)90199-3
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发表时间：
1979-01-01
影响因子：
3.3
通讯作者：
FIGLARZ, M
中科院分区：
文献类型：
--
作者：
GERAND, B;NOWOGROCKI, G;FIGLARZ, M
通过WO3·13H2O水合物的脱水反应，得到了一种新形式的三氧化钨。用X射线粉末衍射法和选区电子衍射法对其结构进行了研究。其结晶学特征为：六方晶系；a=7.298(2)？，c=7.798(3)？；Z=6。这种六方WO_3是由轻微扭曲的(WO_6)八面体组成的，它们的角以六元环的形式排列在垂直于六角形轴线的层中；这些层的堆积导致形成大的六角形隧道。用高分辨电子显微镜对该结构进行了验证。粉末X射线衍射使我们能够确定平均结构。由于没有合适的单晶，我们不能进行完整的结构测定。尽管纯WO_3可能存在这样的六方结构，但到目前为止还没有观察到这种结构。
A new form of tungsten trioxide WO 3 has been obtained by dehydration of WO 3· 1 3 H 2 O hydrate. The structural study was carried out from X-ray powder diffraction and selected area electron diffraction data. The crystallographic characteristics are: the hexagonal system; a= 7.298 (2) Å, c= 7.798 (3) Å; Z= 6. This hexagonal WO 3 is built up of slightly distorted (WO 6) octahedra sharing their corners arranged in six-membered rings in layers normal to the hexagonal axis; stacking of such layers leads to formation of large hexagonal tunnels. Some confirmations of this structure were made by high-resolution electron microscopy. Powder X-ray diffraction allowed us to determine an average structure. Absence of suitable single crystals has not permitted us to perform a complete structural determination. Although the existence of such a hexagonal structure for pure WO 3 had been considered as likely, it had not been hitherto observed.