MgDy2Si2 crystallizes in the tetragonal P4/mbm space group. Mg(1) is bonded in a square co-planar geometry to four equivalent Si(1) atoms. Dy(1) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to two equivalent Mg(1), six equivalent Dy(1), and one Si(1) atom.
MgDy2Si2 crystallizes in the tetragonal P4/mbm space group. Mg(1) is bonded in a square co-planar geometry to four equivalent Si(1) atoms. All Mg(1)-Si(1) bond lengths are 2.86 Å. Dy(1) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. There are two shorter (2.95 Å) and four longer (3.02 Å) Dy(1)-Si(1) bond lengths. Si(1) is bonded in a 9-coordinate geometry to two equivalent Mg(1), six equivalent Dy(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.38 Å.