EuFe4(CuO4)3 crystallizes in the cubic Im-3 space group. Eu(1) is bonded to twelve equivalent O(1) atoms to form EuO12 cuboctahedra that share faces with eight equivalent Fe(1)O6 octahedra. Fe(1) is bonded to six equivalent O(1) atoms to form FeO6 octahedra that share corners with six equivalent Fe(1)O6 octahedra and faces with two equivalent Eu(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 45°. Cu(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. O(1) is bonded in a 4-coordinate geometry to one Eu(1), two equivalent Fe(1), and one Cu(1) atom.
EuFe4(CuO4)3 crystallizes in the cubic Im-3 space group. Eu(1) is bonded to twelve equivalent O(1) atoms to form EuO12 cuboctahedra that share faces with eight equivalent Fe(1)O6 octahedra. All Eu(1)-O(1) bond lengths are 2.65 Å. Fe(1) is bonded to six equivalent O(1) atoms to form FeO6 octahedra that share corners with six equivalent Fe(1)O6 octahedra and faces with two equivalent Eu(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 45°. All Fe(1)-O(1) bond lengths are 2.03 Å. Cu(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. All Cu(1)-O(1) bond lengths are 1.88 Å. O(1) is bonded in a 4-coordinate geometry to one Eu(1), two equivalent Fe(1), and one Cu(1) atom.