Ce6Ni4Si crystallizes in the hexagonal P6_3/m space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 5-coordinate geometry to two equivalent Ni(2) and three equivalent Ni(1) atoms. In the second Ce site, Ce(2) is bonded in a 7-coordinate geometry to five equivalent Ni(1) and two equivalent Si(1) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 9-coordinate geometry to three equivalent Ce(1), five equivalent Ce(2), and one Si(1) atom. In the second Ni site, Ni(2) is bonded in a body-centered cubic geometry to six equivalent Ce(1) and two equivalent Ni(2) atoms. Si(1) is bonded in a distorted q6 geometry to six equivalent Ce(2) and three equivalent Ni(1) atoms.
Ce6Ni4Si crystallizes in the hexagonal P6_3/m space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 5-coordinate geometry to two equivalent Ni(2) and three equivalent Ni(1) atoms. Both Ce(1)-Ni(2) bond lengths are 2.81 Å. There is one shorter (2.66 Å) and two longer (2.98 Å) Ce(1)-Ni(1) bond lengths. In the second Ce site, Ce(2) is bonded in a 7-coordinate geometry to five equivalent Ni(1) and two equivalent Si(1) atoms. There are a spread of Ce(2)-Ni(1) bond distances ranging from 2.83-3.27 Å. Both Ce(2)-Si(1) bond lengths are 3.01 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 9-coordinate geometry to three equivalent Ce(1), five equivalent Ce(2), and one Si(1) atom. The Ni(1)-Si(1) bond length is 2.38 Å. In the second Ni site, Ni(2) is bonded in a body-centered cubic geometry to six equivalent Ce(1) and two equivalent Ni(2) atoms. Both Ni(2)-Ni(2) bond lengths are 2.34 Å. Si(1) is bonded in a distorted q6 geometry to six equivalent Ce(2) and three equivalent Ni(1) atoms.