標題: Multinary Selenides with Unusual Coordination Environment of Bismuth
作者: Chung, Ming-Yan
Lee, Chi-Shen
應用化學系
Department of Applied Chemistry
公開日期: 17-十二月-2012
摘要: New multinary selenides Ae(3)SnPn(2)Se(8) (Ae = Sr, Ba; Pn = Sb, Bi), Sr8.01Ge2.04Bi7.95Se24, 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 Ae(3)SnPn(2)Se(8) (Ae = Sr, Ba; Pn = Sb, Bi) and in Pna2(1) (no. 33) for Sr8.01Ge2.04Bi7.95Se24 and Sr8YGe2Bi7Se24. The structures feature one-dimensional corner sharing tetrahedral (1)(infinity)[MSe3] units, and one-dimensional edge sharing octahedral (1)(infinity)[M4Se10], 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)(infinity)[MSe3] chain. Diffuse reflectance spectra and electronic resistivity measurements indicate semiconducting behaviors; the Sr8YGe2Bi7Se24 Seebeck coefficient is -180 mu V/K at 303 K Electronic structure calculations confirm that the electron count for Sr8YGe2Bi7Se24 is optimal for interatomic bonding in the ionic network.
URI: http://dx.doi.org/10.1021/ic302027b
http://hdl.handle.net/11536/20823
ISSN: 0020-1669
DOI: 10.1021/ic302027b
期刊: INORGANIC CHEMISTRY
Volume: 51
Issue: 24
起始頁: 13328
結束頁: 13333
顯示於類別:期刊論文


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