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- Title
A Layered Tin Bismuth Selenide with Three Different Building Blocks that Account for an Extremely Large Lattice Parameter of 283 Å.
- Authors
Nentwig, Markus; Eisenburger, Lucien; Heinke, Frank; Souchay, Daniel; Oeckler, Oliver
- Abstract
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 R3‾ 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 R3‾ 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.
- Subjects
BISMUTH selenide; TIN selenide; SCANNING transmission electron microscopy; LATTICE constants; JAHN-Teller effect; ATOMIC spectroscopy; SYNCHROTRON radiation
- Publication
Chemistry - A European Journal, 2020, Vol 26, Issue 47, p10676
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.202000663