Materials Data on Sn2Pb2O7 by Materials Project
Pb2Sn2O7 crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Pb3+ is bonded to eight O2- atoms to form distorted PbO8 hexagonal bipyramids that share edges with six equivalent PbO8 hexagonal bipyramids and edges with six equivalent SnO6 octahedra. There are two shorter (2.33 Å) and six longer (2.62 Å) Pb–O bond lengths. Sn4+ is bonded to six equivalent O2- atoms to form SnO6 octahedra that share corners with six equivalent SnO6 octahedra and edges with six equivalent PbO8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 50°. All Sn–O bond lengths are 2.10 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Pb3+ and two equivalent Sn4+ atoms. In the second O2- site, O2- is bonded to four equivalent Pb3+ atoms to form corner-sharing OPb4 tetrahedra.