CaRh2Si2 crystallizes in the tetragonal I4/mmm space group. Ca(1) is bonded in a 16-coordinate geometry to eight equivalent Rh(1) and eight equivalent Si(1) atoms. Rh(1) is bonded to four equivalent Ca(1) and four equivalent Si(1) atoms to form a mixture of distorted corner, edge, and face-sharing RhCa4Si4 tetrahedra. Si(1) is bonded in a 9-coordinate geometry to four equivalent Ca(1), four equivalent Rh(1), and one Si(1) atom.
CaRh2Si2 crystallizes in the tetragonal I4/mmm space group. Ca(1) is bonded in a 16-coordinate geometry to eight equivalent Rh(1) and eight equivalent Si(1) atoms. All Ca(1)-Rh(1) bond lengths are 3.23 Å. All Ca(1)-Si(1) bond lengths are 3.15 Å. Rh(1) is bonded to four equivalent Ca(1) and four equivalent Si(1) atoms to form a mixture of distorted corner, edge, and face-sharing RhCa4Si4 tetrahedra. All Rh(1)-Si(1) bond lengths are 2.38 Å. Si(1) is bonded in a 9-coordinate geometry to four equivalent Ca(1), four equivalent Rh(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.55 Å.