Eu2NiO4 is (La,Ba)CuO4-like structured and crystallizes in the orthorhombic Cmce space group. Eu(1) is bonded in a 9-coordinate geometry to four equivalent O(1) and five equivalent O(2) atoms. Ni(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles are 4°. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Eu(1) and two equivalent Ni(1) atoms to form a mixture of distorted edge, face, and corner-sharing OEu4Ni2 octahedra. The corner-sharing octahedra are not tilted. In the second O site, O(2) is bonded in a 6-coordinate geometry to five equivalent Eu(1) and one Ni(1) atom.
Eu2NiO4 is (La,Ba)CuO4-like structured and crystallizes in the orthorhombic Cmce space group. Eu(1) is bonded in a 9-coordinate geometry to four equivalent O(1) and five equivalent O(2) atoms. There are two shorter (2.54 Å) and two longer (2.59 Å) Eu(1)-O(1) bond lengths. There are a spread of Eu(1)-O(2) bond distances ranging from 2.29-2.88 Å. Ni(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles are 4°. Both Ni(1)-O(2) bond lengths are 2.11 Å. All Ni(1)-O(1) bond lengths are 1.91 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Eu(1) and two equivalent Ni(1) atoms to form a mixture of distorted edge, face, and corner-sharing OEu4Ni2 octahedra. The corner-sharing octahedra are not tilted. In the second O site, O(2) is bonded in a 6-coordinate geometry to five equivalent Eu(1) and one Ni(1) atom.