Nb9Co4Ge is beta Uranium-derived structured and crystallizes in the tetragonal I4/mcm space group. There are three inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 14-coordinate geometry to two equivalent Nb(3), three equivalent Nb(1), four equivalent Nb(2), two equivalent Co(2), and three equivalent Co(1) atoms. In the second Nb site, Nb(2) is bonded in a 6-coordinate geometry to four equivalent Nb(1), one Co(1), two equivalent Co(2), and two equivalent Ge(1) atoms. In the third Nb site, Nb(3) is bonded in a 6-coordinate geometry to two equivalent Nb(3), eight equivalent Nb(1), and four equivalent Co(1) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent Nb(2), two equivalent Nb(3), six equivalent Nb(1), and two equivalent Co(2) atoms to form CoNb10Co2 cuboctahedra that share corners with two equivalent Co(1)Nb10Co2 cuboctahedra, corners with four equivalent Co(2)Nb8Co4 cuboctahedra, edges with three equivalent Co(1)Nb10Co2 cuboctahedra, faces with four equivalent Co(1)Nb10Co2 cuboctahedra, and faces with four equivalent Co(2)Nb8Co4 cuboctahedra. In the second Co site, Co(2) is bonded to four equivalent Nb(1), four equivalent Nb(2), two equivalent Co(1), and two equivalent Co(2) atoms to form CoNb8Co4 cuboctahedra that share corners with two equivalent Co(2)Nb8Co4 cuboctahedra, corners with four equivalent Co(1)Nb10Co2 cuboctahedra, faces with two equivalent Co(2)Nb8Co4 cuboctahedra, and faces with four equivalent Co(1)Nb10Co2 cuboctahedra. Ge(1) is bonded in a 10-coordinate geometry to eight equivalent Nb(2) and two equivalent Ge(1) atoms.
Nb9Co4Ge is beta Uranium-derived structured and crystallizes in the tetragonal I4/mcm space group. There are three inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 14-coordinate geometry to two equivalent Nb(3), three equivalent Nb(1), four equivalent Nb(2), two equivalent Co(2), and three equivalent Co(1) atoms. Both Nb(1)-Nb(3) bond lengths are 3.13 Å. There is one shorter (2.54 Å) and two longer (3.12 Å) Nb(1)-Nb(1) bond lengths. There are a spread of Nb(1)-Nb(2) bond distances ranging from 2.67-3.06 Å. Both Nb(1)-Co(2) bond lengths are 2.76 Å. There are two shorter (2.83 Å) and one longer (2.84 Å) Nb(1)-Co(1) bond length. In the second Nb site, Nb(2) is bonded in a 6-coordinate geometry to four equivalent Nb(1), one Co(1), two equivalent Co(2), and two equivalent Ge(1) atoms. The Nb(2)-Co(1) bond length is 2.73 Å. Both Nb(2)-Co(2) bond lengths are 2.73 Å. Both Nb(2)-Ge(1) bond lengths are 2.78 Å. In the third Nb site, Nb(3) is bonded in a 6-coordinate geometry to two equivalent Nb(3), eight equivalent Nb(1), and four equivalent Co(1) atoms. Both Nb(3)-Nb(3) bond lengths are 2.53 Å. All Nb(3)-Co(1) bond lengths are 2.78 Å. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent Nb(2), two equivalent Nb(3), six equivalent Nb(1), and two equivalent Co(2) atoms to form CoNb10Co2 cuboctahedra that share corners with two equivalent Co(1)Nb10Co2 cuboctahedra, corners with four equivalent Co(2)Nb8Co4 cuboctahedra, edges with three equivalent Co(1)Nb10Co2 cuboctahedra, faces with four equivalent Co(1)Nb10Co2 cuboctahedra, and faces with four equivalent Co(2)Nb8Co4 cuboctahedra. Both Co(1)-Co(2) bond lengths are 2.53 Å. In the second Co site, Co(2) is bonded to four equivalent Nb(1), four equivalent Nb(2), two equivalent Co(1), and two equivalent Co(2) atoms to form CoNb8Co4 cuboctahedra that share corners with two equivalent Co(2)Nb8Co4 cuboctahedra, corners with four equivalent Co(1)Nb10Co2 cuboctahedra, faces with two equivalent Co(2)Nb8Co4 cuboctahedra, and faces with four equivalent Co(1)Nb10Co2 cuboctahedra. Both Co(2)-Co(2) bond lengths are 2.53 Å. Ge(1) is bonded in a 10-coordinate geometry to eight equivalent Nb(2) and two equivalent Ge(1) atoms. Both Ge(1)-Ge(1) bond lengths are 2.53 Å.