Materials Data on KSc(WO4)2 by Materials Project

Abstract

KSc(WO4)2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. K1+ is bonded to twelve O2- atoms to form KO12 cuboctahedra that share edges with six equivalent KO12 cuboctahedra, edges with six equivalent WO4 tetrahedra, and faces with two equivalent ScO6 octahedra. There are six shorter (3.13 Å) and six longer (3.44 Å) K–O bond lengths. Sc3+ is bonded to six equivalent O2- atoms to form ScO6 octahedra that share corners with six equivalent WO4 tetrahedra and faces with two equivalent KO12 cuboctahedra. All Sc–O bond lengths are 2.10 Å. W6+ is bonded to four O2- atoms to form WO4 tetrahedra that share corners with three equivalent ScO6 octahedra and edges with three equivalent KO12 cuboctahedra. The corner-sharing octahedral tilt angles are 18°. There is one shorter (1.78 Å) and three longer (1.83 Å) W–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Sc3+, and one W6+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to three equivalent K1+ and one W6+ atom.