Materials Data on K3Nb6SBr17 by Materials Project
K3Nb6SBr17 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 10-coordinate geometry to ten Br1- atoms. There are a spread of K–Br bond distances ranging from 3.31–4.00 Å. In the second K1+ site, K1+ is bonded in a 10-coordinate geometry to ten Br1- atoms. There are a spread of K–Br bond distances ranging from 3.47–3.93 Å. There are three inequivalent Nb+2.67+ sites. In the first Nb+2.67+ site, Nb+2.67+ is bonded to one S2- and five Br1- atoms to form a mixture of face, edge, and corner-sharing NbSBr5 octahedra. The corner-sharing octahedra tilt angles range from 40–50°. The Nb–S bond length is 2.38 Å. There are a spread of Nb–Br bond distances ranging from 2.62–2.84 Å. In the second Nb+2.67+ site, Nb+2.67+ is bonded to one S2- and five Br1- atoms to form a mixture of face, edge, and corner-sharing NbSBr5 octahedra. The corner-sharing octahedra tilt angles range from 42–44°. The Nb–S bond length is 2.38 Å. There are a spread of Nb–Br bond distances ranging from 2.60–2.76 Å. In the third Nb+2.67+ site, Nb+2.67+ is bonded to one S2- and five Br1- atoms to form a mixture of face, edge, and corner-sharing NbSBr5 octahedra. The corner-sharing octahedra tilt angles range from 42–43°. The Nb–S bond length is 2.39 Å. There are a spread of Nb–Br bond distances ranging from 2.62–2.73 Å. S2- is bonded in a distorted pentagonal pyramidal geometry to six Nb+2.67+ atoms. There are nine inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a distorted trigonal non-coplanar geometry to two equivalent K1+ and one Nb+2.67+ atom. In the second Br1- site, Br1- is bonded in a 4-coordinate geometry to two equivalent K1+ and two Nb+2.67+ atoms. In the third Br1- site, Br1- is bonded in a 2-coordinate geometry to one K1+ and two Nb+2.67+ atoms. In the fourth Br1- site, Br1- is bonded in a 3-coordinate geometry to one K1+ and two Nb+2.67+ atoms. In the fifth Br1- site, Br1- is bonded in a 2-coordinate geometry to one K1+ and two Nb+2.67+ atoms. In the sixth Br1- site, Br1- is bonded in a 2-coordinate geometry to three K1+ and two equivalent Nb+2.67+ atoms. In the seventh Br1- site, Br1- is bonded in a 5-coordinate geometry to four K1+ and one Nb+2.67+ atom. In the eighth Br1- site, Br1- is bonded in a bent 120 degrees geometry to two equivalent Nb+2.67+ atoms. In the ninth Br1- site, Br1- is bonded in a 3-coordinate geometry to one K1+ and two Nb+2.67+ atoms.