Materials Data on K2SbPCO7 by Materials Project
K2CSbPO7 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. K1+ is bonded to six O2- atoms to form distorted KO6 octahedra that share corners with three equivalent PO4 tetrahedra, an edgeedge with one KO6 octahedra, and a faceface with one KO6 octahedra. There are a spread of K–O bond distances ranging from 2.66–2.90 Å. C4+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of C–O bond distances ranging from 1.25–1.36 Å. Sb3+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Sb–O bond distances ranging from 2.08–2.45 Å. P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with six equivalent KO6 octahedra. The corner-sharing octahedra tilt angles range from 48–59°. There are a spread of P–O bond distances ranging from 1.52–1.61 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent K1+ and one C4+ atom. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent K1+, one C4+, and one Sb3+ atom. In the third O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two equivalent K1+, one C4+, and one Sb3+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to one K1+, one Sb3+, and one P5+ atom. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent K1+, one Sb3+, and one P5+ atom. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent K1+ and one P5+ atom.