Er2Rh3Si crystallizes in the trigonal R-3m space group. Er(1) is bonded in a 3-coordinate geometry to nine equivalent Rh(1) atoms. Rh(1) is bonded in a 12-coordinate geometry to six equivalent Er(1), four equivalent Rh(1), and two equivalent Si(1) atoms. Si(1) is bonded to six equivalent Rh(1) atoms to form distorted corner-sharing SiRh6 cuboctahedra.
Er2Rh3Si crystallizes in the trigonal R-3m space group. Er(1) is bonded in a 3-coordinate geometry to nine equivalent Rh(1) atoms. There are three shorter (2.83 Å) and six longer (3.14 Å) Er(1)-Rh(1) bond lengths. Rh(1) is bonded in a 12-coordinate geometry to six equivalent Er(1), four equivalent Rh(1), and two equivalent Si(1) atoms. All Rh(1)-Rh(1) bond lengths are 2.76 Å. Both Rh(1)-Si(1) bond lengths are 2.49 Å. Si(1) is bonded to six equivalent Rh(1) atoms to form distorted corner-sharing SiRh6 cuboctahedra.