Ce2NiSi3 is hexagonal omega structure-derived structured and crystallizes in the hexagonal P-6m2 space group. Ce(1) is bonded to three equivalent Ni(1), three equivalent Si(1), three equivalent Si(2), and three equivalent Si(3) atoms to form a mixture of edge and face-sharing CeSi9Ni3 cuboctahedra. Ni(1) is bonded in a 9-coordinate geometry to six equivalent Ce(1) and three equivalent Si(2) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent Ce(1) and three equivalent Si(3) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Ce(1) and three equivalent Ni(1) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to six equivalent Ce(1) and three equivalent Si(1) atoms.
Ce2NiSi3 is hexagonal omega structure-derived structured and crystallizes in the hexagonal P-6m2 space group. Ce(1) is bonded to three equivalent Ni(1), three equivalent Si(1), three equivalent Si(2), and three equivalent Si(3) atoms to form a mixture of edge and face-sharing CeSi9Ni3 cuboctahedra. All Ce(1)-Ni(1) bond lengths are 3.05 Å. All Ce(1)-Si(1) bond lengths are 3.13 Å. All Ce(1)-Si(2) bond lengths are 3.05 Å. All Ce(1)-Si(3) bond lengths are 3.13 Å. Ni(1) is bonded in a 9-coordinate geometry to six equivalent Ce(1) and three equivalent Si(2) atoms. All Ni(1)-Si(2) bond lengths are 2.35 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent Ce(1) and three equivalent Si(3) atoms. All Si(1)-Si(3) bond lengths are 2.35 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Ce(1) and three equivalent Ni(1) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to six equivalent Ce(1) and three equivalent Si(1) atoms.