Ru2Cd2O7 crystallizes in the tetragonal I4_1/amd space group. Ru(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form RuO6 octahedra that share corners with six equivalent Ru(1)O6 octahedra and edges with six equivalent Cd(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 42-46°. Cd(1) is bonded to two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms to form distorted CdO8 hexagonal bipyramids that share edges with six equivalent Cd(1)O8 hexagonal bipyramids and edges with six equivalent Ru(1)O6 octahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ru(1) and two equivalent Cd(1) atoms to form distorted OCd2Ru2 tetrahedra that share corners with two equivalent O(3)Cd4 tetrahedra, corners with four equivalent O(1)Cd2Ru2 tetrahedra, and  an edgeedge with one O(3)Cd4 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ru(1) and two equivalent Cd(1) atoms. In the third O site, O(3) is bonded to four equivalent Cd(1) atoms to form OCd4 tetrahedra that share corners with four equivalent O(1)Cd2Ru2 tetrahedra, corners with four equivalent O(3)Cd4 tetrahedra, and edges with two equivalent O(1)Cd2Ru2 tetrahedra.
Ru2Cd2O7 crystallizes in the tetragonal I4_1/amd space group. Ru(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form RuO6 octahedra that share corners with six equivalent Ru(1)O6 octahedra and edges with six equivalent Cd(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 42-46°. Both Ru(1)-O(1) bond lengths are 1.95 Å. All Ru(1)-O(2) bond lengths are 1.92 Å. Cd(1) is bonded to two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms to form distorted CdO8 hexagonal bipyramids that share edges with six equivalent Cd(1)O8 hexagonal bipyramids and edges with six equivalent Ru(1)O6 octahedra. Both Cd(1)-O(1) bond lengths are 2.52 Å. Both Cd(1)-O(3) bond lengths are 2.20 Å. All Cd(1)-O(2) bond lengths are 2.58 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ru(1) and two equivalent Cd(1) atoms to form distorted OCd2Ru2 tetrahedra that share corners with two equivalent O(3)Cd4 tetrahedra, corners with four equivalent O(1)Cd2Ru2 tetrahedra, and  an edgeedge with one O(3)Cd4 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ru(1) and two equivalent Cd(1) atoms. In the third O site, O(3) is bonded to four equivalent Cd(1) atoms to form OCd4 tetrahedra that share corners with four equivalent O(1)Cd2Ru2 tetrahedra, corners with four equivalent O(3)Cd4 tetrahedra, and edges with two equivalent O(1)Cd2Ru2 tetrahedra.