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A Layered Tin Bismuth Selenide with Three Different Building Blocks that Account for an Extremely Large Lattice Parameter of 283 Å.
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-03-27 , DOI: 10.1002/chem.202000663 Markus Nentwig 1 , Lucien Eisenburger 2 , Frank Heinke 1 , Daniel Souchay 1 , Oliver Oeckler 1
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-03-27 , DOI: 10.1002/chem.202000663 Markus Nentwig 1 , Lucien Eisenburger 2 , Frank Heinke 1 , Daniel Souchay 1 , Oliver Oeckler 1
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The layered compound Sn2.8(4)Bi20.2(4)Se27 exhibits an extraordinarily long‐periodic 150R stacking sequence. The crystal structure contains three different building blocks, which form upon the addition of Sn to a Bi‐rich bismuth selenide. Sn‐doped Bi2 double (“2”) layers similar to those in elemental bismuth, Sn0.3Bi1.7Se3 quintuple (“5”) layers and Sn0.4Bi2.6Se4 septuple (“7”) layers are arranged in a 7525757525|7525757525|7525757525 sequence, which corresponds to a structure with a=4.1819(4) and c=282.64(6) Å in space group R
m. The structure of a microcrystal was determined using microfocused synchrotron radiation and refined as a formally commensurately modulated structure in (3+1)D superspace (superspace group R
m(00γ)00), with a trivial basic structure that contains just one atom. The stacking sequence as well as the cation distribution are confirmed by aberration‐corrected scanning transmission electron microscopy (STEM) in combination with chemical mapping by X‐ray spectroscopy with atomic resolution. Stacking faults are not typical but have been observed occasionally.
中文翻译：
具有三种不同结构单元的层状硒化锡铋，具有 283 Å 的极大晶格参数。
层状化合物Sn 2.8(4) Bi 20.2(4) Se 27表现出非常长的周期150 R堆积序列。该晶体结构包含三种不同的结构单元，这些结构单元是在富铋硒化铋中添加 Sn 后形成的。Sn掺杂Bi 2双（“2”）层与元素铋类似，Sn 0.3 Bi 1.7 Se 3五重（“5”）层和Sn 0.4 Bi 2.6 Se 4七重（“7”）层排列成a 7525757525|7525757525|7525757525 序列，对应于空间群R m 中a= 4.1819(4) 和c= 282.64(6) Å 的结构 。使用微聚焦同步加速器辐射确定微晶体的结构，并将其细化为 (3+1)D 超空间（超空间群R m(00 γ )00）中的形式相当调制结构，其基本结构仅包含一个原子。通过像差校正扫描透射电子显微镜 (STEM) 结合具有原子分辨率的 X 射线光谱化学测绘，确认了堆积顺序和阳离子分布。堆垛错误并不典型，但偶尔也会观察到。
更新日期：2020-03-27
m. The structure of a microcrystal was determined using microfocused synchrotron radiation and refined as a formally commensurately modulated structure in (3+1)D superspace (superspace group R
m(00γ)00), with a trivial basic structure that contains just one atom. The stacking sequence as well as the cation distribution are confirmed by aberration‐corrected scanning transmission electron microscopy (STEM) in combination with chemical mapping by X‐ray spectroscopy with atomic resolution. Stacking faults are not typical but have been observed occasionally.
中文翻译：
具有三种不同结构单元的层状硒化锡铋，具有 283 Å 的极大晶格参数。
层状化合物Sn 2.8(4) Bi 20.2(4) Se 27表现出非常长的周期150 R堆积序列。该晶体结构包含三种不同的结构单元，这些结构单元是在富铋硒化铋中添加 Sn 后形成的。Sn掺杂Bi 2双（“2”）层与元素铋类似，Sn 0.3 Bi 1.7 Se 3五重（“5”）层和Sn 0.4 Bi 2.6 Se 4七重（“7”）层排列成a 7525757525|7525757525|7525757525 序列，对应于空间群R m 中a= 4.1819(4) 和c= 282.64(6) Å 的结构 。使用微聚焦同步加速器辐射确定微晶体的结构，并将其细化为 (3+1)D 超空间（超空间群R m(00 γ )00）中的形式相当调制结构，其基本结构仅包含一个原子。通过像差校正扫描透射电子显微镜 (STEM) 结合具有原子分辨率的 X 射线光谱化学测绘，确认了堆积顺序和阳离子分布。堆垛错误并不典型，但偶尔也会观察到。
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