Y2Sn2O7 crystallizes in the cubic Fd-3m space group. Y(1) is bonded in a body-centered cubic geometry to two equivalent O(1) and six equivalent O(2) atoms. Sn(1) is bonded to six equivalent O(2) atoms to form corner-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles are 53°. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Y(1) atoms to form OY4 tetrahedra that share corners with four equivalent O(1)Y4 tetrahedra, corners with twelve equivalent O(2)Y2Sn2 tetrahedra, and edges with six equivalent O(2)Y2Sn2 tetrahedra. In the second O site, O(2) is bonded to two equivalent Y(1) and two equivalent Sn(1) atoms to form distorted OY2Sn2 tetrahedra that share corners with two equivalent O(1)Y4 tetrahedra, corners with twelve equivalent O(2)Y2Sn2 tetrahedra,  an edgeedge with one O(1)Y4 tetrahedra, and edges with four equivalent O(2)Y2Sn2 tetrahedra.
Y2Sn2O7 crystallizes in the cubic Fd-3m space group. Y(1) is bonded in a body-centered cubic geometry to two equivalent O(1) and six equivalent O(2) atoms. Both Y(1)-O(1) bond lengths are 2.25 Å. All Y(1)-O(2) bond lengths are 2.50 Å. Sn(1) is bonded to six equivalent O(2) atoms to form corner-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles are 53°. All Sn(1)-O(2) bond lengths are 2.05 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Y(1) atoms to form OY4 tetrahedra that share corners with four equivalent O(1)Y4 tetrahedra, corners with twelve equivalent O(2)Y2Sn2 tetrahedra, and edges with six equivalent O(2)Y2Sn2 tetrahedra. In the second O site, O(2) is bonded to two equivalent Y(1) and two equivalent Sn(1) atoms to form distorted OY2Sn2 tetrahedra that share corners with two equivalent O(1)Y4 tetrahedra, corners with twelve equivalent O(2)Y2Sn2 tetrahedra,  an edgeedge with one O(1)Y4 tetrahedra, and edges with four equivalent O(2)Y2Sn2 tetrahedra.