Abstract
Nine new compounds of composition AB 4 C 5 X 12 with distinct elements being among A: K, Rb, Cs; B: Zn, Cd; C: Ga; X: S, Se, Te were prepared by solving ZnGa 2 S 4 , CdGa 2 S 4 , ZnGa 2 Se 4 , CdGa 2 Se 4 , and CdGa 2 Te 4 in KBr, RbBr, and CsBr, respectively. The crystal structure of KCd 4 Ga 5 S 12 was solved and refined to R = 0.03. It crystallizes with space group R3, the hexagonal lattice parameters being a 0 = 13.782(3) A and c 0 = 9.330(3) A [rhombohedral setting: a 0 = 8.543(2) A, α = 107.53(1)°], and shows a thirteenfold superstructure. KCd 4 Ga 5 S 12 consists of a cubic close packing of sulfur atoms with partially ordered Cd and Ga cations in the tetrahedral interstices. The potassium ion substitutes one sulfur atom and is located inside a cubooctahedral interstice of the sulfur sublattice
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