Er(NiGe)2 crystallizes in the tetragonal I4/mmm space group. Er(1) is bonded in a 16-coordinate geometry to eight equivalent Ni(1) and eight equivalent Ge(1) atoms. Ni(1) is bonded in a 4-coordinate geometry to four equivalent Er(1) and four equivalent Ge(1) atoms. Ge(1) is bonded in a 9-coordinate geometry to four equivalent Er(1), four equivalent Ni(1), and one Ge(1) atom.
Er(NiGe)2 crystallizes in the tetragonal I4/mmm space group. Er(1) is bonded in a 16-coordinate geometry to eight equivalent Ni(1) and eight equivalent Ge(1) atoms. All Er(1)-Ni(1) bond lengths are 3.15 Å. All Er(1)-Ge(1) bond lengths are 3.10 Å. Ni(1) is bonded in a 4-coordinate geometry to four equivalent Er(1) and four equivalent Ge(1) atoms. All Ni(1)-Ge(1) bond lengths are 2.33 Å. Ge(1) is bonded in a 9-coordinate geometry to four equivalent Er(1), four equivalent Ni(1), and one Ge(1) atom. The Ge(1)-Ge(1) bond length is 2.48 Å.