Cu2CdSnSe4 is Stannite structured and crystallizes in the tetragonal I-42m space group. Cu(1) is bonded to four equivalent Se(1) atoms to form CuSe4 tetrahedra that share corners with four equivalent Cu(1)Se4 tetrahedra, corners with four equivalent Cd(1)Se4 tetrahedra, and corners with four equivalent Sn(1)Se4 tetrahedra. Cd(1) is bonded to four equivalent Se(1) atoms to form CdSe4 tetrahedra that share corners with four equivalent Sn(1)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. Sn(1) is bonded to four equivalent Se(1) atoms to form SnSe4 tetrahedra that share corners with four equivalent Cd(1)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. Se(1) is bonded to two equivalent Cu(1), one Cd(1), and one Sn(1) atom to form corner-sharing SeCdCu2Sn tetrahedra.
Cu2CdSnSe4 is Stannite structured and crystallizes in the tetragonal I-42m space group. Cu(1) is bonded to four equivalent Se(1) atoms to form CuSe4 tetrahedra that share corners with four equivalent Cu(1)Se4 tetrahedra, corners with four equivalent Cd(1)Se4 tetrahedra, and corners with four equivalent Sn(1)Se4 tetrahedra. All Cu(1)-Se(1) bond lengths are 2.44 Å. Cd(1) is bonded to four equivalent Se(1) atoms to form CdSe4 tetrahedra that share corners with four equivalent Sn(1)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. All Cd(1)-Se(1) bond lengths are 2.69 Å. Sn(1) is bonded to four equivalent Se(1) atoms to form SnSe4 tetrahedra that share corners with four equivalent Cd(1)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. All Sn(1)-Se(1) bond lengths are 2.62 Å. Se(1) is bonded to two equivalent Cu(1), one Cd(1), and one Sn(1) atom to form corner-sharing SeCdCu2Sn tetrahedra.