MgTb2Si2 crystallizes in the tetragonal P4/mbm space group. Mg(1) is bonded in a distorted square co-planar geometry to four equivalent Si(1) atoms. Tb(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 Tb(1), and one Si(1) atom.
MgTb2Si2 crystallizes in the tetragonal P4/mbm 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 2.88 Å. Tb(1) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. There are two shorter (2.96 Å) and four longer (3.03 Å) Tb(1)-Si(1) bond lengths. Si(1) is bonded in a 9-coordinate geometry to two equivalent Mg(1), six equivalent Tb(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.38 Å.