Er3Gd is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. Er(1) is bonded to eight equivalent Er(1) and four equivalent Gd(1) atoms to form ErGd4Er8 cuboctahedra that share corners with four equivalent Gd(1)Er12 cuboctahedra, corners with fourteen equivalent Er(1)Gd4Er8 cuboctahedra, edges with six equivalent Gd(1)Er12 cuboctahedra, edges with twelve equivalent Er(1)Gd4Er8 cuboctahedra, faces with four equivalent Gd(1)Er12 cuboctahedra, and faces with sixteen equivalent Er(1)Gd4Er8 cuboctahedra. Gd(1) is bonded to twelve equivalent Er(1) atoms to form GdEr12 cuboctahedra that share corners with six equivalent Gd(1)Er12 cuboctahedra, corners with twelve equivalent Er(1)Gd4Er8 cuboctahedra, edges with eighteen equivalent Er(1)Gd4Er8 cuboctahedra, faces with eight equivalent Gd(1)Er12 cuboctahedra, and faces with twelve equivalent Er(1)Gd4Er8 cuboctahedra.
Er3Gd is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. Er(1) is bonded to eight equivalent Er(1) and four equivalent Gd(1) atoms to form ErGd4Er8 cuboctahedra that share corners with four equivalent Gd(1)Er12 cuboctahedra, corners with fourteen equivalent Er(1)Gd4Er8 cuboctahedra, edges with six equivalent Gd(1)Er12 cuboctahedra, edges with twelve equivalent Er(1)Gd4Er8 cuboctahedra, faces with four equivalent Gd(1)Er12 cuboctahedra, and faces with sixteen equivalent Er(1)Gd4Er8 cuboctahedra. There are a spread of Er(1)-Er(1) bond distances ranging from 3.54-3.59 Å. There are two shorter (3.52 Å) and two longer (3.57 Å) Er(1)-Gd(1) bond lengths. Gd(1) is bonded to twelve equivalent Er(1) atoms to form GdEr12 cuboctahedra that share corners with six equivalent Gd(1)Er12 cuboctahedra, corners with twelve equivalent Er(1)Gd4Er8 cuboctahedra, edges with eighteen equivalent Er(1)Gd4Er8 cuboctahedra, faces with eight equivalent Gd(1)Er12 cuboctahedra, and faces with twelve equivalent Er(1)Gd4Er8 cuboctahedra.