CaFeRhSi2 crystallizes in the tetragonal I-4m2 space group. Ca(1) is bonded in a 16-coordinate geometry to four equivalent Fe(1), four equivalent Rh(1), and eight equivalent Si(1) atoms. Fe(1) is bonded to four equivalent Ca(1), four equivalent Rh(1), and four equivalent Si(1) atoms to form a mixture of distorted face and corner-sharing FeCa4Si4Rh4 cuboctahedra. Rh(1) is bonded in a 4-coordinate geometry to four equivalent Ca(1), four equivalent Fe(1), and four equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to four equivalent Ca(1), two equivalent Fe(1), two equivalent Rh(1), and one Si(1) atom.
CaFeRhSi2 crystallizes in the tetragonal I-4m2 space group. Ca(1) is bonded in a 16-coordinate geometry to four equivalent Fe(1), four equivalent Rh(1), and eight equivalent Si(1) atoms. All Ca(1)-Fe(1) bond lengths are 3.18 Å. All Ca(1)-Rh(1) bond lengths are 3.18 Å. All Ca(1)-Si(1) bond lengths are 3.16 Å. Fe(1) is bonded to four equivalent Ca(1), four equivalent Rh(1), and four equivalent Si(1) atoms to form a mixture of distorted face and corner-sharing FeCa4Si4Rh4 cuboctahedra. All Fe(1)-Rh(1) bond lengths are 2.88 Å. All Fe(1)-Si(1) bond lengths are 2.34 Å. Rh(1) is bonded in a 4-coordinate geometry to four equivalent Ca(1), four equivalent Fe(1), and four equivalent Si(1) atoms. All Rh(1)-Si(1) bond lengths are 2.34 Å. Si(1) is bonded in a 9-coordinate geometry to four equivalent Ca(1), two equivalent Fe(1), two equivalent Rh(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.58 Å.