Nd2CdSb4 crystallizes in the tetragonal P-4m2 space group. Nd(1) is bonded in a 10-coordinate geometry to two equivalent Cd(1), two equivalent Sb(2), two equivalent Sb(3), and four equivalent Sb(1) atoms. Cd(1) is bonded to four equivalent Nd(1) and four equivalent Sb(1) atoms to form distorted CdNd4Sb4 tetrahedra that share corners with eight equivalent Sb(1)Nd4Cd2 pentagonal pyramids, edges with four equivalent Sb(1)Nd4Cd2 pentagonal pyramids, and edges with four equivalent Cd(1)Nd4Sb4 tetrahedra. There are three inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to four equivalent Nd(1) and two equivalent Cd(1) atoms to form distorted SbNd4Cd2 pentagonal pyramids that share corners with eight equivalent Sb(1)Nd4Cd2 pentagonal pyramids, corners with four equivalent Cd(1)Nd4Sb4 tetrahedra, edges with two equivalent Sb(1)Nd4Cd2 pentagonal pyramids, edges with two equivalent Cd(1)Nd4Sb4 tetrahedra, and faces with two equivalent Sb(1)Nd4Cd2 pentagonal pyramids. In the second Sb site, Sb(2) is bonded in a 8-coordinate geometry to four equivalent Nd(1) and four equivalent Sb(3) atoms. In the third Sb site, Sb(3) is bonded in a 8-coordinate geometry to four equivalent Nd(1) and four equivalent Sb(2) atoms.
Nd2CdSb4 crystallizes in the tetragonal P-4m2 space group. Nd(1) is bonded in a 10-coordinate geometry to two equivalent Cd(1), two equivalent Sb(2), two equivalent Sb(3), and four equivalent Sb(1) atoms. Both Nd(1)-Cd(1) bond lengths are 3.66 Å. Both Nd(1)-Sb(2) bond lengths are 3.37 Å. Both Nd(1)-Sb(3) bond lengths are 3.37 Å. All Nd(1)-Sb(1) bond lengths are 3.25 Å. Cd(1) is bonded to four equivalent Nd(1) and four equivalent Sb(1) atoms to form distorted CdNd4Sb4 tetrahedra that share corners with eight equivalent Sb(1)Nd4Cd2 pentagonal pyramids, edges with four equivalent Sb(1)Nd4Cd2 pentagonal pyramids, and edges with four equivalent Cd(1)Nd4Sb4 tetrahedra. All Cd(1)-Sb(1) bond lengths are 2.85 Å. There are three inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to four equivalent Nd(1) and two equivalent Cd(1) atoms to form distorted SbNd4Cd2 pentagonal pyramids that share corners with eight equivalent Sb(1)Nd4Cd2 pentagonal pyramids, corners with four equivalent Cd(1)Nd4Sb4 tetrahedra, edges with two equivalent Sb(1)Nd4Cd2 pentagonal pyramids, edges with two equivalent Cd(1)Nd4Sb4 tetrahedra, and faces with two equivalent Sb(1)Nd4Cd2 pentagonal pyramids. In the second Sb site, Sb(2) is bonded in a 8-coordinate geometry to four equivalent Nd(1) and four equivalent Sb(3) atoms. All Sb(2)-Sb(3) bond lengths are 3.06 Å. In the third Sb site, Sb(3) is bonded in a 8-coordinate geometry to four equivalent Nd(1) and four equivalent Sb(2) atoms.