Er5Rh4Ge10 crystallizes in the tetragonal P4/mbm space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 16-coordinate geometry to four equivalent Rh(1), four equivalent Ge(2), and eight equivalent Ge(3) atoms. In the second Er site, Er(2) is bonded to four equivalent Rh(1), two equivalent Ge(1), two equivalent Ge(3), and four equivalent Ge(2) atoms to form face-sharing ErGe8Rh4 cuboctahedra. In the third Er site, Er(3) is bonded in a 14-coordinate geometry to four equivalent Rh(1), two equivalent Ge(3), four equivalent Ge(1), and four equivalent Ge(2) atoms. Rh(1) is bonded in a 10-coordinate geometry to one Er(1), two equivalent Er(2), two equivalent Er(3), one Ge(1), two equivalent Ge(2), and two equivalent Ge(3) atoms. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to two equivalent Er(2), four equivalent Er(3), two equivalent Rh(1), and one Ge(1) atom. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to one Er(1), two equivalent Er(2), two equivalent Er(3), two equivalent Rh(1), and one Ge(2) atom. In the third Ge site, Ge(3) is bonded in a 2-coordinate geometry to one Er(2), one Er(3), two equivalent Er(1), and two equivalent Rh(1) atoms.
Er5Rh4Ge10 crystallizes in the tetragonal P4/mbm space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 16-coordinate geometry to four equivalent Rh(1), four equivalent Ge(2), and eight equivalent Ge(3) atoms. All Er(1)-Rh(1) bond lengths are 3.23 Å. All Er(1)-Ge(2) bond lengths are 3.36 Å. All Er(1)-Ge(3) bond lengths are 2.98 Å. In the second Er site, Er(2) is bonded to four equivalent Rh(1), two equivalent Ge(1), two equivalent Ge(3), and four equivalent Ge(2) atoms to form face-sharing ErGe8Rh4 cuboctahedra. All Er(2)-Rh(1) bond lengths are 3.11 Å. Both Er(2)-Ge(1) bond lengths are 2.94 Å. Both Er(2)-Ge(3) bond lengths are 3.12 Å. All Er(2)-Ge(2) bond lengths are 3.04 Å. In the third Er site, Er(3) is bonded in a 14-coordinate geometry to four equivalent Rh(1), two equivalent Ge(3), four equivalent Ge(1), and four equivalent Ge(2) atoms. All Er(3)-Rh(1) bond lengths are 3.33 Å. Both Er(3)-Ge(3) bond lengths are 3.34 Å. All Er(3)-Ge(1) bond lengths are 3.23 Å. All Er(3)-Ge(2) bond lengths are 3.31 Å. Rh(1) is bonded in a 10-coordinate geometry to one Er(1), two equivalent Er(2), two equivalent Er(3), one Ge(1), two equivalent Ge(2), and two equivalent Ge(3) atoms. The Rh(1)-Ge(1) bond length is 2.52 Å. There is one shorter (2.46 Å) and one longer (2.58 Å) Rh(1)-Ge(2) bond length. Both Rh(1)-Ge(3) bond lengths are 2.44 Å. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to two equivalent Er(2), four equivalent Er(3), two equivalent Rh(1), and one Ge(1) atom. The Ge(1)-Ge(1) bond length is 2.46 Å. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to one Er(1), two equivalent Er(2), two equivalent Er(3), two equivalent Rh(1), and one Ge(2) atom. The Ge(2)-Ge(2) bond length is 2.56 Å. In the third Ge site, Ge(3) is bonded in a 2-coordinate geometry to one Er(2), one Er(3), two equivalent Er(1), and two equivalent Rh(1) atoms.