Tc2Cd2O7 crystallizes in the cubic Fd-3m space group. Tc(1) is bonded to six equivalent O(1) atoms to form TcO6 octahedra that share corners with six equivalent Tc(1)O6 octahedra and edges with six equivalent Cd(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 43°. Cd(1) is bonded to two equivalent O(2) and six equivalent O(1) atoms to form distorted CdO8 hexagonal bipyramids that share edges with six equivalent Cd(1)O8 hexagonal bipyramids and edges with six equivalent Tc(1)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Tc(1) and two equivalent Cd(1) atoms. In the second O site, O(2) is bonded to four equivalent Cd(1) atoms to form corner-sharing OCd4 tetrahedra.
Tc2Cd2O7 crystallizes in the cubic Fd-3m space group. Tc(1) is bonded to six equivalent O(1) atoms to form TcO6 octahedra that share corners with six equivalent Tc(1)O6 octahedra and edges with six equivalent Cd(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 43°. All Tc(1)-O(1) bond lengths are 1.93 Å. Cd(1) is bonded to two equivalent O(2) and six equivalent O(1) atoms to form distorted CdO8 hexagonal bipyramids that share edges with six equivalent Cd(1)O8 hexagonal bipyramids and edges with six equivalent Tc(1)O6 octahedra. Both Cd(1)-O(2) bond lengths are 2.21 Å. All Cd(1)-O(1) bond lengths are 2.58 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Tc(1) and two equivalent Cd(1) atoms. In the second O site, O(2) is bonded to four equivalent Cd(1) atoms to form corner-sharing OCd4 tetrahedra.