A layered tin bismuth selenide with three different building blocks that account for an extremely large lattice parameter of 283 Å
| Autor: | Daniel Souchay, Frank Heinke, Lucien Eisenburger, Oliver Oeckler, Markus Nentwig |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Layered Compounds
long-periodic crystal structure Stacking chemistry.chemical_element Crystal structure 010402 general chemistry 01 natural sciences Catalysis Bismuth chemistry.chemical_compound Lattice constant tin bismuth Atom Scanning transmission electron microscopy selenium 010405 organic chemistry Communication Organic Chemistry General Chemistry Communications 0104 chemical sciences Crystallography chemistry Bismuth selenide Tin |
| Zdroj: | 'Chemistry-A European Journal ', vol: 26, pages: 10676-10681 (2020) Chemistry (Weinheim an Der Bergstrasse, Germany) |
| ISSN: | 0947-6539 |
| Popis: | 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 3‾ 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 3‾ 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. Layering up: 150R‐Sn2.8(4)Bi20.2(4)Se27 exhibits an extraordinarily long‐periodic layered structure with a lattice parameter of c=282.6(6) Å. The structure is built up from three different kinds of slabs, that is, double, quintuple and septuple layers, which has been confirmed by STEM‐HAADF and EDX with atomic resolution. |
| Databáze: | OpenAIRE |
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