SmCo9Si4 is Bergman Structure: Mg32(Al,Zn)49 Bergman-like structured and crystallizes in the tetragonal I4/mcm space group. Sm(1) is bonded in a 24-coordinate geometry to eight equivalent Co(1), eight equivalent Co(3), 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 Sm(1), one Co(2), two equivalent Co(1), two equivalent Co(3), and four equivalent Si(1) atoms. In the second Co site, Co(2) is bonded in a cuboctahedral geometry to four equivalent Co(1), four equivalent Co(3), and four equivalent Si(1) atoms. In the third Co site, Co(3) is bonded in a 12-coordinate geometry to two equivalent Sm(1), one Co(2), two equivalent Co(1), three equivalent Co(3), and four equivalent Si(1) atoms. Si(1) is bonded in a 11-coordinate geometry to two equivalent Sm(1), one Co(2), four equivalent Co(1), and four equivalent Co(3) atoms.
SmCo9Si4 is Bergman Structure: Mg32(Al,Zn)49 Bergman-like structured and crystallizes in the tetragonal I4/mcm space group. Sm(1) is bonded in a 24-coordinate geometry to eight equivalent Co(1), eight equivalent Co(3), and eight equivalent Si(1) atoms. All Sm(1)-Co(1) bond lengths are 3.12 Å. All Sm(1)-Co(3) bond lengths are 3.30 Å. All Sm(1)-Si(1) bond lengths are 3.20 Å. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 11-coordinate geometry to two equivalent Sm(1), one Co(2), two equivalent Co(1), two equivalent Co(3), and four equivalent Si(1) atoms. The Co(1)-Co(2) bond length is 2.51 Å. Both Co(1)-Co(1) bond lengths are 2.55 Å. Both Co(1)-Co(3) bond lengths are 2.52 Å. There are two shorter (2.30 Å) and two longer (2.38 Å) Co(1)-Si(1) bond lengths. In the second Co site, Co(2) is bonded in a cuboctahedral geometry to four equivalent Co(1), four equivalent Co(3), and four equivalent Si(1) atoms. All Co(2)-Co(3) bond lengths are 2.39 Å. All Co(2)-Si(1) bond lengths are 2.32 Å. In the third Co site, Co(3) is bonded in a 12-coordinate geometry to two equivalent Sm(1), one Co(2), two equivalent Co(1), three equivalent Co(3), and four equivalent Si(1) atoms. There are two shorter (2.25 Å) and one longer (2.56 Å) Co(3)-Co(3) bond length. There are two shorter (2.50 Å) and two longer (2.53 Å) Co(3)-Si(1) bond lengths. Si(1) is bonded in a 11-coordinate geometry to two equivalent Sm(1), one Co(2), four equivalent Co(1), and four equivalent Co(3) atoms.