Several new quaternary sulfides, K2Y4Sn2S11 and BaLnAgS3 (Ln = Er, Y, Gd), have been synthesized by the reaction of the constituent binary chalcogenides and elements at 1000°C. The crystal structures of K2Y4Sn2S11 and BaErAgS3 have been determined by single-crystal X-ray diffraction techniques. Crystal data: K2Y4Sn2S11-space group D84h - P4/ncc, M = 1023.88, Z = 4, a = 8.587(1), c = 27.892(4) Å (T = 115 K), V = 2056.7(4) Å3, Rw (F2) = 0.093 for 1965 observations and 48 variables, R(F) = 0.034 for 1319 observations having F2o > 2σ(F2o); BaEr AgS3-space group C32h - C2/m, M = 508.65, Z = 4, a = 17.340(4), b = 4.014(1), c = 8.509(2) Å, β = 103.23(3)°, (T = 115 K), V = 576.5(2) Å3Rw(F2) = 0.049 for 1404 observations and 48 variables, R(F) = 0.018 for 1299 observations having F2o > 2σ(F2o). In both structures the rare-earth atoms have octahedral coordination and the octahedra form slabs through edge- and corner-sharing. These slabs are separated by K+ or Ba2+ cations, and are crosslinked into three-dimensional frameworks by Sn2S6 units as edge-sharing SnS4 tetrahedral pairs in K2Y4Sn2S11, and by Ag2S9 units as corner-sharing trigonal-bipyramidal AgS5 pairs in BaEr AgS3. From their powder diffraction patterns, BaYAgS3 and Ba GdAgS3 appear to be isostructural with BaErAgS3.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry