Sn1Ge3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Sn(1) is bonded to four equivalent Ge(2) and eight equivalent Ge(1) atoms to form SnGe12 cuboctahedra that share corners with four equivalent Sn(1)Ge12 cuboctahedra, corners with eight equivalent Ge(2)Sn4Ge8 cuboctahedra, edges with eight equivalent Sn(1)Ge12 cuboctahedra, edges with sixteen equivalent Ge(1)Sn4Ge8 cuboctahedra, faces with four equivalent Sn(1)Ge12 cuboctahedra, faces with six equivalent Ge(2)Sn4Ge8 cuboctahedra, and faces with eight equivalent Ge(1)Sn4Ge8 cuboctahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to four equivalent Sn(1), four equivalent Ge(1), and four equivalent Ge(2) atoms to form distorted GeSn4Ge8 cuboctahedra that share corners with twelve equivalent Ge(1)Sn4Ge8 cuboctahedra, edges with eight equivalent Sn(1)Ge12 cuboctahedra, edges with eight equivalent Ge(1)Sn4Ge8 cuboctahedra, edges with eight equivalent Ge(2)Sn4Ge8 cuboctahedra, faces with four equivalent Sn(1)Ge12 cuboctahedra, faces with four equivalent Ge(2)Sn4Ge8 cuboctahedra, and faces with ten equivalent Ge(1)Sn4Ge8 cuboctahedra. In the second Ge site, Ge(2) is bonded to four equivalent Sn(1) and eight equivalent Ge(1) atoms to form distorted GeSn4Ge8 cuboctahedra that share corners with four equivalent Ge(2)Sn4Ge8 cuboctahedra, corners with eight equivalent Sn(1)Ge12 cuboctahedra, edges with eight equivalent Ge(2)Sn4Ge8 cuboctahedra, edges with sixteen equivalent Ge(1)Sn4Ge8 cuboctahedra, faces with four equivalent Ge(2)Sn4Ge8 cuboctahedra, faces with six equivalent Sn(1)Ge12 cuboctahedra, and faces with eight equivalent Ge(1)Sn4Ge8 cuboctahedra.
Sn1Ge3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Sn(1) is bonded to four equivalent Ge(2) and eight equivalent Ge(1) atoms to form SnGe12 cuboctahedra that share corners with four equivalent Sn(1)Ge12 cuboctahedra, corners with eight equivalent Ge(2)Sn4Ge8 cuboctahedra, edges with eight equivalent Sn(1)Ge12 cuboctahedra, edges with sixteen equivalent Ge(1)Sn4Ge8 cuboctahedra, faces with four equivalent Sn(1)Ge12 cuboctahedra, faces with six equivalent Ge(2)Sn4Ge8 cuboctahedra, and faces with eight equivalent Ge(1)Sn4Ge8 cuboctahedra. All Sn(1)-Ge(2) bond lengths are 3.09 Å. All Sn(1)-Ge(1) bond lengths are 3.12 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to four equivalent Sn(1), four equivalent Ge(1), and four equivalent Ge(2) atoms to form distorted GeSn4Ge8 cuboctahedra that share corners with twelve equivalent Ge(1)Sn4Ge8 cuboctahedra, edges with eight equivalent Sn(1)Ge12 cuboctahedra, edges with eight equivalent Ge(1)Sn4Ge8 cuboctahedra, edges with eight equivalent Ge(2)Sn4Ge8 cuboctahedra, faces with four equivalent Sn(1)Ge12 cuboctahedra, faces with four equivalent Ge(2)Sn4Ge8 cuboctahedra, and faces with ten equivalent Ge(1)Sn4Ge8 cuboctahedra. All Ge(1)-Ge(1) bond lengths are 3.09 Å. All Ge(1)-Ge(2) bond lengths are 3.12 Å. In the second Ge site, Ge(2) is bonded to four equivalent Sn(1) and eight equivalent Ge(1) atoms to form distorted GeSn4Ge8 cuboctahedra that share corners with four equivalent Ge(2)Sn4Ge8 cuboctahedra, corners with eight equivalent Sn(1)Ge12 cuboctahedra, edges with eight equivalent Ge(2)Sn4Ge8 cuboctahedra, edges with sixteen equivalent Ge(1)Sn4Ge8 cuboctahedra, faces with four equivalent Ge(2)Sn4Ge8 cuboctahedra, faces with six equivalent Sn(1)Ge12 cuboctahedra, and faces with eight equivalent Ge(1)Sn4Ge8 cuboctahedra.