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Die trikline Kristallstruktur von Ag2Bi2S3Cl2: Pseudosymmetrie und Zwillingsbildung
Author(s) -
Ruck Michael
Publication year - 2002
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/1521-3749(200202)628:2<453::aid-zaac453>3.0.co;2-6
Subject(s) - crystallography , triclinic crystal system , monoclinic crystal system , crystal twinning , crystal structure , stacking , ion , lattice constant , slow cooling , chemistry , sulfide , materials science , diffraction , microstructure , metallurgy , physics , organic chemistry , optics
Ruby‐red crystals of Ag 2 Bi 2 S 3 Cl 2 were synthesized from AgCl and Bi 2 S 3 by cooling a melt from 770 K to room temperature. X‐ray diffraction on powders and single‐crystals revealed a triclinic crystal structure with special lattice constants ( P &1macr; (No. 2), a = 1085.0(2), b = 717.2(1), c = 1137.6(1) pm, α = 89.80(1)?, β = 74.80(1)?, γ = 87.81(1)?). In the structure [Bi III S 3 Cl 4 ] polyhedra form 2[BiS 3/2 Cl 4/4 ] ‐ double‐layers by sharing common faces and edges. The silver(I) cations between the layers are coordinated either octahedrally by sulfide ions or tetrahedrally by sulfide and chloride ions. The deviations from the monoclinic space group P 1 2 1 / c 1 are small and induce twinning along [010]. Further pseudosymmetry is based on the stacking of layer packages with the symmetry of the layer group P ( 2/c ) 2 1 /c 2/b .