Eu4Sb2O is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a linear geometry to four equivalent Sb(1) and two equivalent O(1) atoms. In the second Eu site, Eu(2) is bonded in a 6-coordinate geometry to five equivalent Sb(1) and one O(1) atom. Sb(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1) and five equivalent Eu(2) atoms. O(1) is bonded to two equivalent Eu(2) and four equivalent Eu(1) atoms to form corner-sharing OEu6 octahedra. The corner-sharing octahedra are not tilted.
Eu4Sb2O is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a linear geometry to four equivalent Sb(1) and two equivalent O(1) atoms. All Eu(1)-Sb(1) bond lengths are 3.38 Å. Both Eu(1)-O(1) bond lengths are 2.44 Å. In the second Eu site, Eu(2) is bonded in a 6-coordinate geometry to five equivalent Sb(1) and one O(1) atom. There is one shorter (3.29 Å) and four longer (3.49 Å) Eu(2)-Sb(1) bond lengths. The Eu(2)-O(1) bond length is 2.85 Å. Sb(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1) and five equivalent Eu(2) atoms. O(1) is bonded to two equivalent Eu(2) and four equivalent Eu(1) atoms to form corner-sharing OEu6 octahedra. The corner-sharing octahedra are not tilted.