NdCo9Si4 is Bergman Structure: Mg32(Al,Zn)49 Bergman-like structured and 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 Si(1) atoms. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 11-coordinate geometry to two equivalent Nd(1), one Co(3), two equivalent Co(1), two equivalent Co(2), and four equivalent Si(1) atoms. In the second 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 Si(1) atoms. In the third Co site, Co(3) is bonded in a cuboctahedral geometry to four equivalent Co(1), four equivalent Co(2), and four equivalent Si(1) atoms. Si(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.
NdCo9Si4 is Bergman Structure: Mg32(Al,Zn)49 Bergman-like structured and 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 Si(1) atoms. All Nd(1)-Co(1) bond lengths are 3.13 Å. All Nd(1)-Co(2) bond lengths are 3.31 Å. All Nd(1)-Si(1) bond lengths are 3.21 Å. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 11-coordinate geometry to two equivalent Nd(1), one Co(3), two equivalent Co(1), two equivalent Co(2), and four equivalent Si(1) atoms. The Co(1)-Co(3) bond length is 2.51 Å. Both Co(1)-Co(1) bond lengths are 2.55 Å. Both Co(1)-Co(2) bond lengths are 2.52 Å. There are two shorter (2.31 Å) and two longer (2.38 Å) Co(1)-Si(1) bond lengths. In the second 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 Si(1) atoms. The Co(2)-Co(3) bond length is 2.39 Å. There are two shorter (2.26 Å) and one longer (2.56 Å) Co(2)-Co(2) bond length. There are two shorter (2.50 Å) and two longer (2.54 Å) Co(2)-Si(1) bond lengths. In the third Co site, Co(3) is bonded in a cuboctahedral geometry to four equivalent Co(1), four equivalent Co(2), and four equivalent Si(1) atoms. All Co(3)-Si(1) bond lengths are 2.32 Å. Si(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.