Nickel(II) uranium(IV) tris­ulfide

Crystals of NiUS₃ were obtained from the reaction of the elements Ni, U, S, and of GeI₂ in a CsCl flux at 1173 K. Nickel(II) uranium(IV) tris­ulfide, NiUS₃, has ortho­rhom­bic (Pnma) symmetry and crystallizes in the GdFeO₃ structure type. The compound has a perovskite ABQ₃-like structure, with U occupying the inter­stitial sites of a NiS₆ framework. The U atoms are coordinated by eight S atoms in a distorted bicapped trigonal–prismatic arrangement. The Ni atoms are coordinated by six S atoms in a slightly distorted octa­hedral arrangement. The asymmetric unit comprises one U site (site symmetry .m.), one Ni site (-1), and two S sites (1 and .m.).