CeMgSi2 crystallizes in the tetragonal I4_1/amd space group. Mg(1) is bonded in a distorted square co-planar geometry to four equivalent Si(1) atoms. Ce(1) is bonded in a 10-coordinate geometry to four equivalent Si(1) and six Si(2,2) atoms. There are six inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Mg(1), four equivalent Ce(1), and one Si(2) atom. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Ce(1), one Si(1), and two equivalent Si(2) atoms. In the third Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Ce(1), one Si(1), and two equivalent Si(2) atoms. In the fourth Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Ce(1), one Si(1), and two equivalent Si(2) atoms. In the fifth Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Ce(1), one Si(1), and two equivalent Si(2) atoms. In the sixth Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Ce(1), one Si(1), and two equivalent Si(2) atoms.
CeMgSi2 crystallizes in the tetragonal I4_1/amd space group. Mg(1) is bonded in a distorted square co-planar geometry to four equivalent Si(1) atoms. All Mg(1)-Si(1) bond lengths are 2.77 Å. Ce(1) is bonded in a 10-coordinate geometry to four equivalent Si(1) and six Si(2,2) atoms. All Ce(1)-Si(1) bond lengths are 3.19 Å. There are two shorter (3.12 Å) and four longer (3.24 Å) Ce(1)-Si(2,2) bond lengths. There are six inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Mg(1), four equivalent Ce(1), and one Si(2) atom. The Si(1)-Si(2) bond length is 2.31 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Ce(1), one Si(1), and two equivalent Si(2) atoms. Both Si(2)-Si(2) bond lengths are 2.37 Å. In the third Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Ce(1), one Si(1), and two equivalent Si(2) atoms. There are two shorter (3.12 Å) and four longer (3.24 Å) Si(2)-Ce(1) bond lengths. The Si(2)-Si(1) bond length is 2.31 Å. In the fourth Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Ce(1), one Si(1), and two equivalent Si(2) atoms. There are two shorter (3.12 Å) and four longer (3.24 Å) Si(2)-Ce(1) bond lengths. The Si(2)-Si(1) bond length is 2.31 Å. Both Si(2)-Si(2) bond lengths are 2.37 Å. In the fifth Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Ce(1), one Si(1), and two equivalent Si(2) atoms. The Si(2)-Si(1) bond length is 2.31 Å. Both Si(2)-Si(2) bond lengths are 2.37 Å. In the sixth Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Ce(1), one Si(1), and two equivalent Si(2) atoms. There are two shorter (3.12 Å) and four longer (3.24 Å) Si(2)-Ce(1) bond lengths. The Si(2)-Si(1) bond length is 2.31 Å.