Ba3Cd2Sb4 crystallizes in the monoclinic C2/m space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to three equivalent Cd(1), three equivalent Sb(2), and four equivalent Sb(1) atoms. In the second Ba site, Ba(2) is bonded to two equivalent Sb(2) and four equivalent Sb(1) atoms to form edge-sharing BaSb6 octahedra. Cd(1) is bonded in a 4-coordinate geometry to three equivalent Ba(1), one Sb(1), and three equivalent Sb(2) atoms. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 8-coordinate geometry to two equivalent Ba(2), four equivalent Ba(1), one Cd(1), and one Sb(1) atom. In the second Sb site, Sb(2) is bonded in a 7-coordinate geometry to one Ba(2), three equivalent Ba(1), and three equivalent Cd(1) atoms.
Ba3Cd2Sb4 crystallizes in the monoclinic C2/m space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to three equivalent Cd(1), three equivalent Sb(2), and four equivalent Sb(1) atoms. There are two shorter (3.74 Å) and one longer (3.83 Å) Ba(1)-Cd(1) bond length. There are two shorter (3.58 Å) and one longer (3.71 Å) Ba(1)-Sb(2) bond length. There are two shorter (3.65 Å) and two longer (3.80 Å) Ba(1)-Sb(1) bond lengths. In the second Ba site, Ba(2) is bonded to two equivalent Sb(2) and four equivalent Sb(1) atoms to form edge-sharing BaSb6 octahedra. Both Ba(2)-Sb(2) bond lengths are 3.47 Å. All Ba(2)-Sb(1) bond lengths are 3.50 Å. Cd(1) is bonded in a 4-coordinate geometry to three equivalent Ba(1), one Sb(1), and three equivalent Sb(2) atoms. The Cd(1)-Sb(1) bond length is 2.97 Å. There are two shorter (2.94 Å) and one longer (2.99 Å) Cd(1)-Sb(2) bond length. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 8-coordinate geometry to two equivalent Ba(2), four equivalent Ba(1), one Cd(1), and one Sb(1) atom. The Sb(1)-Sb(1) bond length is 2.84 Å. In the second Sb site, Sb(2) is bonded in a 7-coordinate geometry to one Ba(2), three equivalent Ba(1), and three equivalent Cd(1) atoms.