ErGa2 is hexagonal omega structure structured and crystallizes in the hexagonal P6/mmm space group. Er(1) is bonded to twelve equivalent Ga(1) atoms to form a mixture of face and edge-sharing ErGa12 cuboctahedra. Ga(1) is bonded in a 9-coordinate geometry to six equivalent Er(1) and three equivalent Ga(1) atoms.
ErGa2 is hexagonal omega structure structured and crystallizes in the hexagonal P6/mmm space group. Er(1) is bonded to twelve equivalent Ga(1) atoms to form a mixture of face and edge-sharing ErGa12 cuboctahedra. All Er(1)-Ga(1) bond lengths are 3.14 Å. Ga(1) is bonded in a 9-coordinate geometry to six equivalent Er(1) and three equivalent Ga(1) atoms. All Ga(1)-Ga(1) bond lengths are 2.39 Å.