TbAg2Si2 crystallizes in the tetragonal I4/mmm space group. Tb(1) is bonded in a 16-coordinate geometry to eight equivalent Ag(1) and eight equivalent Si(1) atoms. Ag(1) is bonded to four equivalent Tb(1), four equivalent Ag(1), and four equivalent Si(1) atoms to form a mixture of distorted corner, face, and edge-sharing AgTb4Si4Ag4 cuboctahedra. Si(1) is bonded in a 9-coordinate geometry to four equivalent Tb(1), four equivalent Ag(1), and one Si(1) atom.
TbAg2Si2 crystallizes in the tetragonal I4/mmm space group. Tb(1) is bonded in a 16-coordinate geometry to eight equivalent Ag(1) and eight equivalent Si(1) atoms. All Tb(1)-Ag(1) bond lengths are 3.39 Å. All Tb(1)-Si(1) bond lengths are 3.14 Å. Ag(1) is bonded to four equivalent Tb(1), four equivalent Ag(1), and four equivalent Si(1) atoms to form a mixture of distorted corner, face, and edge-sharing AgTb4Si4Ag4 cuboctahedra. All Ag(1)-Ag(1) bond lengths are 2.93 Å. All Ag(1)-Si(1) bond lengths are 2.58 Å. Si(1) is bonded in a 9-coordinate geometry to four equivalent Tb(1), four equivalent Ag(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.28 Å.