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 Sn_2.8(4) Bi_20.2(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, Sn_0.3 Bi_1.7 Se₃ quintuple ("5") layers and Sn_0.4 Bi_2.6 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 str

SUBMITTER: Nentwig M 

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

REPOSITORIES: biostudies-literature