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A Layered Tin Bismuth Selenide with Three Different Building Blocks that Account for an Extremely Large Lattice Parameter of 283?A.

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, Sn0.3 Bi1.7 Se3 quintuple ("5") layers and Sn0.4 Bi2.6 Se4 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(00?)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.

SUBMITTER: Nentwig M 

PROVIDER: S-EPMC7497267 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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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.

Nentwig Markus M   Eisenburger Lucien L   Heinke Frank F   Souchay Daniel D   Oeckler Oliver O  

Chemistry (Weinheim an der Bergstrasse, Germany) 20200727 47

The layered compound Sn<sub>2.8(4)</sub> Bi<sub>20.2(4)</sub> Se<sub>27</sub> 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 Bi<sub>2</sub> double ("2") layers similar to those in elemental bismuth, Sn<sub>0.3</sub> Bi<sub>1.7</sub> Se<sub>3</sub> quintuple ("5") layers and Sn<sub>0.4</sub> Bi<sub>2.6</sub> Se<sub>4</sub> septuple ("7") lay  ...[more]

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