Title: Synthesis and characterization of a new quaternary selenide Sr(3)GeSb(2)Se(8)
Authors: Yu, Ching-Yi
Wang, Ming-Fang
Chung, Ming-Yang
Jang, Shyue-Ming
Huang, Jih-Chen
Lee, Chi-Shen
Department of Applied Chemistry
Institute of Molecular science
Keywords: crystal structure;germanium;antimony;selenium;solid-state synthesis;semiconductor
Issue Date: 1-Sep-2008
Abstract: A new quaternary selenide Sr(3)GeSb(2)Se(8) has been synthesized at 750 degrees C from pure elements in a stoichiometric ratio under vacuum. The product as-synthesized is characterized by single-crystal X-ray diffraction, diffuse reflectance spectroscopy, and thermoanalysis. The title compound crystallizes in the orthorhombic space group Pnma with a = 12.633(4) angstrom, b = 4.301(1) angstrom, c = 28.693(7) angstrom, V = 1558.8(8) angstrom(3), Z = 4, R(1)/wR(2) = 0.0582/0.1221, and GOF = 1.077. The structure of Sr(3)GeSb(2)Se(8) features a new structural type that consists of one-dimensional chains of vertex-sharing tetrahedra (1)(infinity)[MSe(3)] (M = Ge/Sb) and fused double chains of edge-shared square pyramids (1)(infinity)[M(2)Se(5)], which are held together by Sr(2+) ions. A band gap of 0.75 eV for Sr(3)GeSb(2)Se(8) was derived from its diffuse reflectance spectrum. (C) 2007 Elsevier Masson SAS. All rights reserved.
URI: http://dx.doi.org/10.1016/j.solidstatesciences.2007.12.010
ISSN: 1293-2558
DOI: 10.1016/j.solidstatesciences.2007.12.010
Volume: 10
Issue: 9
Begin Page: 1145
End Page: 1149
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