Eu2Sn2O7 crystallizes in the cubic Fd-3m space group. Eu(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(2) and six equivalent O(1) atoms. Sn(1) is bonded to six equivalent O(1) atoms to form corner-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles are 51°. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Eu(1) and two equivalent Sn(1) atoms to form distorted OEu2Sn2 tetrahedra that share corners with two equivalent O(2)Eu4 tetrahedra, corners with twelve equivalent O(1)Eu2Sn2 tetrahedra,  an edgeedge with one O(2)Eu4 tetrahedra, and edges with four equivalent O(1)Eu2Sn2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Eu(1) atoms to form OEu4 tetrahedra that share corners with four equivalent O(2)Eu4 tetrahedra, corners with twelve equivalent O(1)Eu2Sn2 tetrahedra, and edges with six equivalent O(1)Eu2Sn2 tetrahedra.
Eu2Sn2O7 crystallizes in the cubic Fd-3m space group. Eu(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(2) and six equivalent O(1) atoms. Both Eu(1)-O(2) bond lengths are 2.28 Å. All Eu(1)-O(1) bond lengths are 2.55 Å. Sn(1) is bonded to six equivalent O(1) atoms to form corner-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles are 51°. All Sn(1)-O(1) bond lengths are 2.06 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Eu(1) and two equivalent Sn(1) atoms to form distorted OEu2Sn2 tetrahedra that share corners with two equivalent O(2)Eu4 tetrahedra, corners with twelve equivalent O(1)Eu2Sn2 tetrahedra,  an edgeedge with one O(2)Eu4 tetrahedra, and edges with four equivalent O(1)Eu2Sn2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Eu(1) atoms to form OEu4 tetrahedra that share corners with four equivalent O(2)Eu4 tetrahedra, corners with twelve equivalent O(1)Eu2Sn2 tetrahedra, and edges with six equivalent O(1)Eu2Sn2 tetrahedra.