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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Structural elucidation of the Bi 1) + (n = 3, 4, 5 and 6) family of fluorite superstructures by transmission electron microscopy
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Structural elucidation of the Bi 1) + (n = 3, 4, 5 and 6) family of fluorite superstructures by transmission electron microscopy

机译：透射电子显微镜对萤石超结构Bi 1）+（n = 3、4、5和6）族的结构解析

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摘要

The cationic framework structure of a whole new family of compounds with the general formula Bii 2( + 2) M0 n 0 6(n + 1) (n = 3, 4, 5 and 6) has been elucidated by transmission electron microscopy (TEM) methods. High-resolution transmission electron microscopy (HRTEM) has been used to postulate heavy-atom models based on the known structure of the n = 3 phase, Bi10Mo3024. These models were tested by HRTEM image simulation, electron diffraction and powder X-ray diffraction simulation methods which agreed with the experimental results. The four known phases of this family correspond to n = 3, 4, 5 and 6 members and all show fluorite superstructures. They consist of a commonδ -Bi2O 3 fluoritetype framework, inside of which are distributed ribbons of {MoO4} tetrahedra which are infinite along b, one tetrahedron thick along c, and of variable widths of 3, 4, 5 or 6 (MoO4) tetrahedra along a depending on the family member (n value). These {MoO4} tetrahedra are isolated, i. e. without sharing any corner as in the [Bi 12O14] columnar structural-type phase Bi[Bi12O14][Mo04]4[VO4]. The structure of all these family members can be described as crystallographic shear derivatives from Aurivillius-type phases such as Bi2MoO6, the n =oo end member. All these compounds are good oxygen-ion conductors.
机译：已通过透射电子显微镜（TEM）阐明了通式为Bii 2（+ 2）M0 n 0 6（n +1）（n = 3、4、5和6）的全新化合物家族的阳离子骨架结构） 方法。基于n = 3相的已知结构Bi10Mo3024，高分辨率透射电子显微镜（HRTEM）已被用于假设重原子模型。通过HRTEM图像模拟，电子衍射和粉末X射线衍射模拟方法对这些模型进行了测试，结果与实验结果吻合。该族的四个已知相对应于n = 3、4、5和6个成员，并且都显示出萤石超结构。它们由共同的δ-Bi2O 3萤石型骨架组成，其内部是{MoO4}四面体的分布带，它们沿b是无限的，沿c是一个四面体厚，并且具有3、4、5或6（MoO4）可变宽度的四面体取决于家庭成员（n值）。这些{MoO4}四面体是分离的，即。 e。不像[Bi 12O14]柱状结构型相Bi [Bi12O14] [Mo04] 4 [VO4]那样共享任何角。所有这些家族成员的结构都可以描述为Aurivillius型相（如Bi2MoO6，n = oo端基）的结晶剪切衍生物。所有这些化合物都是良好的氧离子导体。

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