Ce10NiSi5 crystallizes in the orthorhombic Fmm2 space group. There are four inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to one Ni(1), one Si(2), two equivalent Si(1), and two equivalent Si(3) atoms to form corner-sharing CeSi5Ni octahedra. The corner-sharing octahedral tilt angles range from 0-58°. In the second Ce site, Ce(2) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Si(1), and two equivalent Si(3) atoms. In the third Ce site, Ce(3) is bonded in a 5-coordinate geometry to one Si(2), two equivalent Si(1), and two equivalent Si(3) atoms. In the fourth Ce site, Ce(4) is bonded in a 5-coordinate geometry to one Ni(1), one Si(2), one Si(3), and two equivalent Si(1) atoms. Ni(1) is bonded in a 9-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), four equivalent Ce(4), and one Si(2) atom. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted q6 geometry to two equivalent Ce(1), two equivalent Ce(2), two equivalent Ce(3), and four equivalent Ce(4) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Ce(1), two equivalent Ce(3), four equivalent Ce(4), and one Ni(1) atom. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), two equivalent Ce(3), two equivalent Ce(4), and one Si(3) atom.
Ce10NiSi5 crystallizes in the orthorhombic Fmm2 space group. There are four inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to one Ni(1), one Si(2), two equivalent Si(1), and two equivalent Si(3) atoms to form corner-sharing CeSi5Ni octahedra. The corner-sharing octahedral tilt angles range from 0-58°. The Ce(1)-Ni(1) bond length is 3.10 Å. The Ce(1)-Si(2) bond length is 3.08 Å. Both Ce(1)-Si(1) bond lengths are 3.21 Å. There is one shorter (3.08 Å) and one longer (3.09 Å) Ce(1)-Si(3) bond length. In the second Ce site, Ce(2) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Si(1), and two equivalent Si(3) atoms. The Ce(2)-Ni(1) bond length is 3.03 Å. Both Ce(2)-Si(1) bond lengths are 3.07 Å. Both Ce(2)-Si(3) bond lengths are 3.06 Å. In the third Ce site, Ce(3) is bonded in a 5-coordinate geometry to one Si(2), two equivalent Si(1), and two equivalent Si(3) atoms. The Ce(3)-Si(2) bond length is 3.01 Å. Both Ce(3)-Si(1) bond lengths are 3.07 Å. Both Ce(3)-Si(3) bond lengths are 3.05 Å. In the fourth Ce site, Ce(4) is bonded in a 5-coordinate geometry to one Ni(1), one Si(2), one Si(3), and two equivalent Si(1) atoms. The Ce(4)-Ni(1) bond length is 3.02 Å. The Ce(4)-Si(2) bond length is 3.03 Å. The Ce(4)-Si(3) bond length is 3.00 Å. There is one shorter (3.07 Å) and one longer (3.09 Å) Ce(4)-Si(1) bond length. Ni(1) is bonded in a 9-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), four equivalent Ce(4), and one Si(2) atom. The Ni(1)-Si(2) bond length is 2.47 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted q6 geometry to two equivalent Ce(1), two equivalent Ce(2), two equivalent Ce(3), and four equivalent Ce(4) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Ce(1), two equivalent Ce(3), four equivalent Ce(4), and one Ni(1) atom. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), two equivalent Ce(3), two equivalent Ce(4), and one Si(3) atom. The Si(3)-Si(3) bond length is 2.50 Å.