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Na 6 CoS 4  crystallizes in the hexagonal space group P 6 3 mc with a = 890.9(2) pm and c = 687.8(2) pm, Z = 2. The crystal structure was determined from four circle diffractometer data and refined to a conventional R-value of 0.020. Na 6 CoS 4  is isotypic with Na 6 ZnO 4 . The crystal structure can be derived from a h.c.p. arrangement of S atoms. Co atoms occupy tetrahedral voids, the resulting CoS 4 -tetrahedra being almost regular with an average Co-S distance of 235 pm. Na atoms occupy tetrahedral and octahedral voids in the ratio 1:1.

Na 6 CoS 4 - ein Thiocobaltat mit isolierten CoS 4 -Anionen / Na 6 CoS 4 - A Thiocobaltate with Isolated CoS 4 Anions