Materials Data on SnPbF4 by Materials Project
PbSnF4 crystallizes in the tetragonal P4/nmm space group. The structure is two-dimensional and consists of one PbSnF4 sheet oriented in the (0, 0, 1) direction. Pb2+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are four shorter (2.55 Å) and four longer (2.96 Å) Pb–F bond lengths. Sn2+ is bonded in a distorted pentagonal planar geometry to five F1- atoms. There are one shorter (2.12 Å) and four longer (2.28 Å) Sn–F bond lengths. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one Sn2+ atom. In the second F1- site, F1- is bonded to four equivalent Pb2+ atoms to form a mixture of edge and corner-sharing FPb4 tetrahedra. In the third F1- site, F1- is bonded in a distorted bent 150 degrees geometry to two equivalent Pb2+ and two equivalent Sn2+ atoms.