A new quaternary selenide Sr3GeSb2Se8 has been synthesized at 750 °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) Å, b = 4.301(1) Å, c = 28.693(7) Å, V = 1558.8(8) Å3, Z = 4, R1/wR2 = 0.0582/0.1221, and GOF = 1.077. The structure of Sr3GeSb2Se8 features a new structural type that consists of one-dimensional chains of vertex-sharing tetrahedra ∞1[MSe3] (M = Ge/Sb) and fused double chains of edge-shared square pyramids ∞1[M2 Se5], which are held together by Sr2+ ions. A band gap of 0.75 eV for Sr3GeSb2Se8 was derived from its diffuse reflectance spectrum.
|Number of pages||5|
|Journal||Solid State Sciences|
|State||Published - 1 Sep 2008|
- Crystal structure
- Solid-state synthesis