Nb9Ni4Ge 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 6-coordinate geometry to two equivalent Nb(1) and four equivalent Ni(2) atoms. In the second Nb site, Nb(2) is bonded in a 7-coordinate geometry to one Nb(2), one Nb(3), two equivalent Ni(1), and three equivalent Ni(2) atoms. In the third Nb site, Nb(3) is bonded in a 6-coordinate geometry to one Nb(2), one Ni(2), two equivalent Ni(1), and two equivalent Ge(1) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to four equivalent Nb(2), four equivalent Nb(3), two equivalent Ni(1), and two equivalent Ni(2) atoms to form NiNb8Ni4 cuboctahedra that share corners with two equivalent Ni(1)Nb8Ni4 cuboctahedra, corners with four equivalent Ni(2)Nb10Ni2 cuboctahedra, faces with two equivalent Ni(1)Nb8Ni4 cuboctahedra, and faces with four equivalent Ni(2)Nb10Ni2 cuboctahedra. In the second Ni site, Ni(2) is bonded to two equivalent Nb(1), two equivalent Nb(3), six equivalent Nb(2), and two equivalent Ni(1) atoms to form NiNb10Ni2 cuboctahedra that share corners with two equivalent Ni(2)Nb10Ni2 cuboctahedra, corners with four equivalent Ni(1)Nb8Ni4 cuboctahedra, edges with three equivalent Ni(2)Nb10Ni2 cuboctahedra, faces with four equivalent Ni(2)Nb10Ni2 cuboctahedra, and faces with four equivalent Ni(1)Nb8Ni4 cuboctahedra. Ge(1) is bonded in a 10-coordinate geometry to eight equivalent Nb(3) and two equivalent Ge(1) atoms.
Nb9Ni4Ge 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 6-coordinate geometry to two equivalent Nb(1) and four equivalent Ni(2) atoms. Both Nb(1)-Nb(1) bond lengths are 2.54 Å. All Nb(1)-Ni(2) bond lengths are 2.76 Å. In the second Nb site, Nb(2) is bonded in a 7-coordinate geometry to one Nb(2), one Nb(3), two equivalent Ni(1), and three equivalent Ni(2) atoms. The Nb(2)-Nb(2) bond length is 2.57 Å. The Nb(2)-Nb(3) bond length is 2.66 Å. Both Nb(2)-Ni(1) bond lengths are 2.77 Å. There is one shorter (2.83 Å) and two longer (2.85 Å) Nb(2)-Ni(2) bond lengths. In the third Nb site, Nb(3) is bonded in a 6-coordinate geometry to one Nb(2), one Ni(2), two equivalent Ni(1), and two equivalent Ge(1) atoms. The Nb(3)-Ni(2) bond length is 2.77 Å. Both Nb(3)-Ni(1) bond lengths are 2.76 Å. Both Nb(3)-Ge(1) bond lengths are 2.76 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to four equivalent Nb(2), four equivalent Nb(3), two equivalent Ni(1), and two equivalent Ni(2) atoms to form NiNb8Ni4 cuboctahedra that share corners with two equivalent Ni(1)Nb8Ni4 cuboctahedra, corners with four equivalent Ni(2)Nb10Ni2 cuboctahedra, faces with two equivalent Ni(1)Nb8Ni4 cuboctahedra, and faces with four equivalent Ni(2)Nb10Ni2 cuboctahedra. Both Ni(1)-Ni(1) bond lengths are 2.54 Å. Both Ni(1)-Ni(2) bond lengths are 2.56 Å. In the second Ni site, Ni(2) is bonded to two equivalent Nb(1), two equivalent Nb(3), six equivalent Nb(2), and two equivalent Ni(1) atoms to form NiNb10Ni2 cuboctahedra that share corners with two equivalent Ni(2)Nb10Ni2 cuboctahedra, corners with four equivalent Ni(1)Nb8Ni4 cuboctahedra, edges with three equivalent Ni(2)Nb10Ni2 cuboctahedra, faces with four equivalent Ni(2)Nb10Ni2 cuboctahedra, and faces with four equivalent Ni(1)Nb8Ni4 cuboctahedra. Ge(1) is bonded in a 10-coordinate geometry to eight equivalent Nb(3) and two equivalent Ge(1) atoms. Both Ge(1)-Ge(1) bond lengths are 2.54 Å.