Sm2Pt2O7 crystallizes in the cubic Fd-3m space group. Sm(1) is bonded in a body-centered cubic geometry to two equivalent O(2) and six equivalent O(1) atoms. Pt(1) is bonded to six equivalent O(1) atoms to form corner-sharing PtO6 octahedra. The corner-sharing octahedral tilt angles are 52°. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sm(1) and two equivalent Pt(1) atoms to form distorted OSm2Pt2 tetrahedra that share corners with two equivalent O(2)Sm4 tetrahedra, corners with twelve equivalent O(1)Sm2Pt2 tetrahedra,  an edgeedge with one O(2)Sm4 tetrahedra, and edges with four equivalent O(1)Sm2Pt2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Sm(1) atoms to form OSm4 tetrahedra that share corners with four equivalent O(2)Sm4 tetrahedra, corners with twelve equivalent O(1)Sm2Pt2 tetrahedra, and edges with six equivalent O(1)Sm2Pt2 tetrahedra.
Sm2Pt2O7 crystallizes in the cubic Fd-3m space group. Sm(1) is bonded in a body-centered cubic geometry to two equivalent O(2) and six equivalent O(1) atoms. Both Sm(1)-O(2) bond lengths are 2.24 Å. All Sm(1)-O(1) bond lengths are 2.49 Å. Pt(1) is bonded to six equivalent O(1) atoms to form corner-sharing PtO6 octahedra. The corner-sharing octahedral tilt angles are 52°. All Pt(1)-O(1) bond lengths are 2.04 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sm(1) and two equivalent Pt(1) atoms to form distorted OSm2Pt2 tetrahedra that share corners with two equivalent O(2)Sm4 tetrahedra, corners with twelve equivalent O(1)Sm2Pt2 tetrahedra,  an edgeedge with one O(2)Sm4 tetrahedra, and edges with four equivalent O(1)Sm2Pt2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Sm(1) atoms to form OSm4 tetrahedra that share corners with four equivalent O(2)Sm4 tetrahedra, corners with twelve equivalent O(1)Sm2Pt2 tetrahedra, and edges with six equivalent O(1)Sm2Pt2 tetrahedra.