Materials Data on K4Sb2O5 by Materials Project
K4Sb2O5 is Krennerite-derived structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are four inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are four shorter (2.84 Å) and two longer (3.33 Å) K–O bond lengths. In the second K1+ site, K1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are two shorter (2.70 Å) and four longer (2.93 Å) K–O bond lengths. In the third K1+ site, K1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are one shorter (2.77 Å) and four longer (2.83 Å) K–O bond lengths. In the fourth K1+ site, K1+ is bonded to six O2- atoms to form distorted edge-sharing KO6 pentagonal pyramids. There are two shorter (2.68 Å) and four longer (2.94 Å) K–O bond lengths. There are two inequivalent Sb3+ sites. In the first Sb3+ site, Sb3+ is bonded in a distorted trigonal non-coplanar geometry to three O2- atoms. There is two shorter (1.94 Å) and one longer (2.04 Å) Sb–O bond length. In the second Sb3+ site, Sb3+ is bonded in a distorted trigonal non-coplanar geometry to three O2- atoms. There is two shorter (1.94 Å) and one longer (2.04 Å) Sb–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to three K1+ and two Sb3+ atoms. In the second O2- site, O2- is bonded to five K1+ and one Sb3+ atom to form a mixture of distorted edge, corner, and face-sharing OK5Sb octahedra. The corner-sharing octahedra tilt angles range from 41–65°. In the third O2- site, O2- is bonded to five K1+ and one Sb3+ atom to form a mixture of distorted edge, corner, and face-sharing OK5Sb octahedra. The corner-sharing octahedra tilt angles range from 41–65°.