Ca2Sn2O5 crystallizes in the orthorhombic Pbam space group. Ca(1) is bonded in a 7-coordinate geometry to two equivalent O(1), two equivalent O(2), and three equivalent O(3) atoms. Sn(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing SnO5 square pyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Ca(1) and two equivalent Sn(1) atoms to form edge-sharing OCa4Sn2 octahedra. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to two equivalent Ca(1) and two equivalent Sn(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Ca(1) and two equivalent Sn(1) atoms.
Ca2Sn2O5 crystallizes in the orthorhombic Pbam space group. Ca(1) is bonded in a 7-coordinate geometry to two equivalent O(1), two equivalent O(2), and three equivalent O(3) atoms. Both Ca(1)-O(1) bond lengths are 2.70 Å. Both Ca(1)-O(2) bond lengths are 2.50 Å. There are a spread of Ca(1)-O(3) bond distances ranging from 2.41-2.84 Å. Sn(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing SnO5 square pyramids. The Sn(1)-O(1) bond length is 2.16 Å. There is one shorter (2.11 Å) and one longer (2.14 Å) Sn(1)-O(2) bond length. Both Sn(1)-O(3) bond lengths are 2.12 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Ca(1) and two equivalent Sn(1) atoms to form edge-sharing OCa4Sn2 octahedra. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to two equivalent Ca(1) and two equivalent Sn(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Ca(1) and two equivalent Sn(1) atoms.