Multinary selenides with unusual coordination environment of bismuth

Ming Yan Chung, Chi-Shen Lee*

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

New multinary selenides Ae3SnPn2Se8 (Ae = Sr, Ba; Pn = Sb, Bi), Sr8.01Ge2.04Bi7.95Se 24, and Sr8YGe2Bi7Se24 were synthesized by solid-state reaction, and their structures were determined by single-crystal X-ray diffraction. These compounds crystallize in orthorhombic space group Pnma (no. 62) for Ae3SnPn2Se8 (Ae = Sr, Ba; Pn = Sb, Bi) and in Pna21 (no. 33) for Sr 8.01Ge2.04Bi7.95Se24 and Sr 8YGe2Bi7Se24. The structures feature one-dimensional corner sharing tetrahedral ∞1[MSe3] units, and one-dimensional edge sharing octahedral ∞1[M 4Se10], packed with the alkaline earth or rare earth cations. Sr8.01Ge2.04Bi7.95Se24 and Sr8YGe2Bi7Se24 contain a triple cell superlattice structure derived from a special arrangement of Bi and Ge in the tetrahedrally coordinated ∞1[MSe3] chain. Diffuse reflectance spectra and electronic resistivity measurements indicate semiconducting behaviors; the Sr8YGe2Bi7Se 24 Seebeck coefficient is -180 μV/K at 303 K. Electronic structure calculations confirm that the electron count for Sr8YGe 2Bi7Se24 is optimal for interatomic bonding in the ionic network.

Original languageEnglish
Pages (from-to)13328-13333
Number of pages6
JournalInorganic Chemistry
Volume51
Issue number24
DOIs
StatePublished - 17 Dec 2012

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