Materials Data on RbSn2(PO4)3 by Materials Project
RbSn2(PO4)3 crystallizes in the trigonal R-3 space group. The structure is three-dimensional. there are two inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded to twelve O2- atoms to form RbO12 cuboctahedra that share corners with six equivalent SnO6 octahedra, edges with six equivalent PO4 tetrahedra, and faces with two equivalent SnO6 octahedra. The corner-sharing octahedral tilt angles are 51°. There are six shorter (2.83 Å) and six longer (3.33 Å) Rb–O bond lengths. In the second Rb1+ site, Rb1+ is bonded to twelve O2- atoms to form RbO12 cuboctahedra that share corners with six equivalent SnO6 octahedra, edges with six equivalent PO4 tetrahedra, and faces with two equivalent SnO6 octahedra. The corner-sharing octahedral tilt angles are 54°. There are six shorter (2.99 Å) and six longer (3.42 Å) Rb–O bond lengths. There are two inequivalent Sn4+ sites. In the first Sn4+ site, Sn4+ is bonded to six O2- atoms to form SnO6 octahedra that share corners with three equivalent RbO12 cuboctahedra, corners with six equivalent PO4 tetrahedra, and a faceface with one RbO12 cuboctahedra. There are three shorter (2.05 Å) and three longer (2.08 Å) Sn–O bond lengths. In the second Sn4+ site, Sn4+ is bonded to six O2- atoms to form SnO6 octahedra that share corners with three equivalent RbO12 cuboctahedra, corners with six equivalent PO4 tetrahedra, and a faceface with one RbO12 cuboctahedra. All Sn–O bond lengths are 2.07 Å. P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with four SnO6 octahedra and edges with two RbO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 31–46°. There is one shorter (1.54 Å) and three longer (1.55 Å) P–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Rb1+, one Sn4+, and one P5+ atom. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Rb1+, one Sn4+, and one P5+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to one Rb1+, one Sn4+, and one P5+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to one Rb1+, one Sn4+, and one P5+ atom.