Ce2CoSi3 is hexagonal omega structure-derived structured and crystallizes in the hexagonal P-6m2 space group. Ce(1) is bonded to three equivalent Co(1), three equivalent Si(1), three equivalent Si(2), and three equivalent Si(3) atoms to form a mixture of face and edge-sharing CeCo3Si9 cuboctahedra. Co(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 Co(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.
Ce2CoSi3 is hexagonal omega structure-derived structured and crystallizes in the hexagonal P-6m2 space group. Ce(1) is bonded to three equivalent Co(1), three equivalent Si(1), three equivalent Si(2), and three equivalent Si(3) atoms to form a mixture of face and edge-sharing CeCo3Si9 cuboctahedra. All Ce(1)-Co(1) bond lengths are 3.03 Å. All Ce(1)-Si(1) bond lengths are 3.16 Å. All Ce(1)-Si(2) bond lengths are 3.03 Å. All Ce(1)-Si(3) bond lengths are 3.16 Å. Co(1) is bonded in a 9-coordinate geometry to six equivalent Ce(1) and three equivalent Si(2) atoms. All Co(1)-Si(2) bond lengths are 2.34 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 2.34 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Ce(1) and three equivalent Co(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.