Abstract
Two new ternary chromium sulfides, Ba 3CrS 5, and Ba 3Cr 2S 6 were synthesized by the reaction of sulfur, barium sulfide, and chromium metal under a high pressure of 5 GPa at 1200°C. Ba 3CrS 5 crystallized in the hexagonal space group P6 3 cm (No. 185) with a=9.1208(3) Å, c=6.1930(3) Å, V=446.17(3) Å 3, and Z=6. It had a column structure with one-dimensional chains of [CrS 3] ∞ composed of face-sharing CrS 6 octahedra surrounded with Ba 2+ ions. Additional S columns surrounded with Ba ions were running along with the CrS 6 columns. Ba 3Cr 2S 6 crystallized in the trigonal space group R-3 c (No. 167) with a=11.8179(7) Å, c=12.796(1) Å, V=1547.7(2) Å 3, and Z=6. The structure of Ba 3Cr 2S 6 also contains [CrS 3] ∞ chains but the chains are composed of octahedral and trigonal prismatic CrS 6 units, which are alternately stacked in a face-sharing manner. The formal charges of Cr ions in Ba 3CrS 5 and Ba 3Cr 2S 6 are 4+ and 3+, respectively.
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