Materials Data on Ca2Sn3O8 by Materials Project
Ca2Sn3O8 is beta indium sulfide-derived structured and crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Ca2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ca–O bond distances ranging from 2.33–2.53 Å. There are two inequivalent Sn4+ sites. In the first Sn4+ site, Sn4+ is bonded to six O2- atoms to form edge-sharing SnO6 octahedra. There are four shorter (2.10 Å) and two longer (2.13 Å) Sn–O bond lengths. In the second Sn4+ site, Sn4+ is bonded to six O2- atoms to form edge-sharing SnO6 octahedra. There are a spread of Sn–O bond distances ranging from 2.07–2.19 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ca2+ and two equivalent Sn4+ atoms. In the second O2- site, O2- is bonded in a distorted see-saw-like geometry to one Ca2+ and three Sn4+ atoms. In the third O2- site, O2- is bonded to two equivalent Ca2+ and two Sn4+ atoms to form a mixture of distorted edge and corner-sharing OCa2Sn2 tetrahedra.