ErZnGe crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 12-coordinate geometry to six equivalent Zn(1) and six equivalent Ge(1) atoms. In the second Er site, Er(2) is bonded to six equivalent Ge(1) atoms to form distorted edge-sharing ErGe6 octahedra. Zn(1) is bonded in a 6-coordinate geometry to three equivalent Er(1) and three equivalent Ge(1) atoms. Ge(1) is bonded in a 9-coordinate geometry to three equivalent Er(1), three equivalent Er(2), and three equivalent Zn(1) atoms.
ErZnGe crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 12-coordinate geometry to six equivalent Zn(1) and six equivalent Ge(1) atoms. All Er(1)-Zn(1) bond lengths are 2.88 Å. All Er(1)-Ge(1) bond lengths are 3.21 Å. In the second Er site, Er(2) is bonded to six equivalent Ge(1) atoms to form distorted edge-sharing ErGe6 octahedra. All Er(2)-Ge(1) bond lengths are 2.98 Å. Zn(1) is bonded in a 6-coordinate geometry to three equivalent Er(1) and three equivalent Ge(1) atoms. All Zn(1)-Ge(1) bond lengths are 2.46 Å. Ge(1) is bonded in a 9-coordinate geometry to three equivalent Er(1), three equivalent Er(2), and three equivalent Zn(1) atoms.