NdCo9Ga4 crystallizes in the tetragonal I4/mcm space group. Nd(1) is bonded in a 24-coordinate geometry to eight equivalent Co(1), eight equivalent Co(2), and eight equivalent Ga(1) atoms. There are three inequivalent Co sites. In the first Co site, Co(3) is bonded in a cuboctahedral geometry to four equivalent Co(1), four equivalent Co(2), and four equivalent Ga(1) atoms. In the second Co site, Co(1) is bonded in a 12-coordinate geometry to two equivalent Nd(1), one Co(3), two equivalent Co(2), three equivalent Co(1), and four equivalent Ga(1) atoms. In the third Co site, Co(2) is bonded in a 12-coordinate geometry to two equivalent Nd(1), one Co(3), two equivalent Co(1), three equivalent Co(2), and four equivalent Ga(1) atoms. Ga(1) is bonded in a 11-coordinate geometry to two equivalent Nd(1), one Co(3), four equivalent Co(1), and four equivalent Co(2) atoms.
NdCo9Ga4 crystallizes in the tetragonal I4/mcm space group. Nd(1) is bonded in a 24-coordinate geometry to eight equivalent Co(1), eight equivalent Co(2), and eight equivalent Ga(1) atoms. All Nd(1)-Co(1) bond lengths are 3.36 Å. All Nd(1)-Co(2) bond lengths are 3.34 Å. All Nd(1)-Ga(1) bond lengths are 3.27 Å. There are three inequivalent Co sites. In the first Co site, Co(3) is bonded in a cuboctahedral geometry to four equivalent Co(1), four equivalent Co(2), and four equivalent Ga(1) atoms. All Co(3)-Co(1) bond lengths are 2.46 Å. All Co(3)-Co(2) bond lengths are 2.41 Å. All Co(3)-Ga(1) bond lengths are 2.51 Å. In the second Co site, Co(1) is bonded in a 12-coordinate geometry to two equivalent Nd(1), one Co(3), two equivalent Co(2), three equivalent Co(1), and four equivalent Ga(1) atoms. Both Co(1)-Co(2) bond lengths are 2.57 Å. There are two shorter (2.34 Å) and one longer (2.72 Å) Co(1)-Co(1) bond length. There are two shorter (2.55 Å) and two longer (2.62 Å) Co(1)-Ga(1) bond lengths. In the third Co site, Co(2) is bonded in a 12-coordinate geometry to two equivalent Nd(1), one Co(3), two equivalent Co(1), three equivalent Co(2), and four equivalent Ga(1) atoms. There are two shorter (2.54 Å) and one longer (2.56 Å) Co(2)-Co(2) bond length. There are a spread of Co(2)-Ga(1) bond distances ranging from 2.40-2.47 Å. Ga(1) is bonded in a 11-coordinate geometry to two equivalent Nd(1), one Co(3), four equivalent Co(1), and four equivalent Co(2) atoms.