Ce2RhSi3 crystallizes in the hexagonal P6/mmm space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to twelve equivalent Si(1) atoms to form CeSi12 cuboctahedra that share edges with twelve equivalent Ce(2)Si8Rh4 cuboctahedra, faces with two equivalent Ce(1)Si12 cuboctahedra, and faces with six equivalent Ce(2)Si8Rh4 cuboctahedra. In the second Ce site, Ce(2) is bonded to four equivalent Rh(1) and eight equivalent Si(1) atoms to form CeSi8Rh4 cuboctahedra that share edges with four equivalent Ce(1)Si12 cuboctahedra, edges with eight equivalent Ce(2)Si8Rh4 cuboctahedra, faces with two equivalent Ce(1)Si12 cuboctahedra, and faces with six equivalent Ce(2)Si8Rh4 cuboctahedra. Rh(1) is bonded in a 9-coordinate geometry to six equivalent Ce(2) and three equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to two equivalent Ce(1), four equivalent Ce(2), one Rh(1), and two equivalent Si(1) atoms.
Ce2RhSi3 crystallizes in the hexagonal P6/mmm space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to twelve equivalent Si(1) atoms to form CeSi12 cuboctahedra that share edges with twelve equivalent Ce(2)Si8Rh4 cuboctahedra, faces with two equivalent Ce(1)Si12 cuboctahedra, and faces with six equivalent Ce(2)Si8Rh4 cuboctahedra. All Ce(1)-Si(1) bond lengths are 3.17 Å. In the second Ce site, Ce(2) is bonded to four equivalent Rh(1) and eight equivalent Si(1) atoms to form CeSi8Rh4 cuboctahedra that share edges with four equivalent Ce(1)Si12 cuboctahedra, edges with eight equivalent Ce(2)Si8Rh4 cuboctahedra, faces with two equivalent Ce(1)Si12 cuboctahedra, and faces with six equivalent Ce(2)Si8Rh4 cuboctahedra. All Ce(2)-Rh(1) bond lengths are 3.17 Å. All Ce(2)-Si(1) bond lengths are 3.17 Å. Rh(1) is bonded in a 9-coordinate geometry to six equivalent Ce(2) and three equivalent Si(1) atoms. All Rh(1)-Si(1) bond lengths are 2.38 Å. Si(1) is bonded in a 9-coordinate geometry to two equivalent Ce(1), four equivalent Ce(2), one Rh(1), and two equivalent Si(1) atoms. Both Si(1)-Si(1) bond lengths are 2.36 Å.