Er4PdGa12 crystallizes in the cubic Im-3m space group. Er(1) is bonded to six equivalent Ga(1) and six equivalent Ga(2) atoms to form ErGa12 cuboctahedra that share corners with twelve equivalent Er(1)Ga12 cuboctahedra, edges with twelve equivalent Ga(1)Er4Ga8 cuboctahedra, faces with six equivalent Er(1)Ga12 cuboctahedra, faces with six equivalent Ga(1)Er4Ga8 cuboctahedra, and faces with two equivalent Pd(1)Ga6 octahedra. Pd(1) is bonded to six equivalent Ga(2) atoms to form PdGa6 octahedra that share corners with twenty-four equivalent Ga(1)Er4Ga8 cuboctahedra and faces with eight equivalent Er(1)Ga12 cuboctahedra. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to four equivalent Er(1), four equivalent Ga(1), and four equivalent Ga(2) atoms to form distorted GaEr4Ga8 cuboctahedra that share corners with four equivalent Ga(1)Er4Ga8 cuboctahedra, corners with four equivalent Pd(1)Ga6 octahedra, edges with eight equivalent Er(1)Ga12 cuboctahedra, edges with eight equivalent Ga(1)Er4Ga8 cuboctahedra, faces with four equivalent Er(1)Ga12 cuboctahedra, and faces with six equivalent Ga(1)Er4Ga8 cuboctahedra. The corner-sharing octahedral tilt angles are 51°. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to four equivalent Er(1), one Pd(1), and four equivalent Ga(1) atoms.
Er4PdGa12 crystallizes in the cubic Im-3m space group. Er(1) is bonded to six equivalent Ga(1) and six equivalent Ga(2) atoms to form ErGa12 cuboctahedra that share corners with twelve equivalent Er(1)Ga12 cuboctahedra, edges with twelve equivalent Ga(1)Er4Ga8 cuboctahedra, faces with six equivalent Er(1)Ga12 cuboctahedra, faces with six equivalent Ga(1)Er4Ga8 cuboctahedra, and faces with two equivalent Pd(1)Ga6 octahedra. All Er(1)-Ga(1) bond lengths are 3.01 Å. All Er(1)-Ga(2) bond lengths are 3.03 Å. Pd(1) is bonded to six equivalent Ga(2) atoms to form PdGa6 octahedra that share corners with twenty-four equivalent Ga(1)Er4Ga8 cuboctahedra and faces with eight equivalent Er(1)Ga12 cuboctahedra. All Pd(1)-Ga(2) bond lengths are 2.53 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to four equivalent Er(1), four equivalent Ga(1), and four equivalent Ga(2) atoms to form distorted GaEr4Ga8 cuboctahedra that share corners with four equivalent Ga(1)Er4Ga8 cuboctahedra, corners with four equivalent Pd(1)Ga6 octahedra, edges with eight equivalent Er(1)Ga12 cuboctahedra, edges with eight equivalent Ga(1)Er4Ga8 cuboctahedra, faces with four equivalent Er(1)Ga12 cuboctahedra, and faces with six equivalent Ga(1)Er4Ga8 cuboctahedra. The corner-sharing octahedral tilt angles are 51°. All Ga(1)-Ga(1) bond lengths are 3.01 Å. All Ga(1)-Ga(2) bond lengths are 2.74 Å. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to four equivalent Er(1), one Pd(1), and four equivalent Ga(1) atoms.