CeMg2Si2 crystallizes in the tetragonal P4/mmm space group. Mg(1) is bonded in a distorted square co-planar geometry to four equivalent Si(1) atoms. Ce(1) is bonded to eight equivalent Si(1) atoms to form a mixture of distorted face and edge-sharing CeSi8 hexagonal bipyramids. Si(1) is bonded in a 9-coordinate geometry to four equivalent Mg(1), four equivalent Ce(1), and one Si(1) atom.
CeMg2Si2 crystallizes in the tetragonal P4/mmm 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 2.76 Å. Ce(1) is bonded to eight equivalent Si(1) atoms to form a mixture of distorted face and edge-sharing CeSi8 hexagonal bipyramids. All Ce(1)-Si(1) bond lengths are 3.21 Å. Si(1) is bonded in a 9-coordinate geometry to four equivalent Mg(1), four equivalent Ce(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.30 Å.