ErNiO3 is Orthorhombic Perovskite structured and crystallizes in the monoclinic P2_1/c space group. Er(1) is bonded in a 8-coordinate geometry to two equivalent O(1), three equivalent O(2), and three equivalent O(3) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 34-35°. In the second Ni site, Ni(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 34-35°. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Er(1), one Ni(1), and one Ni(2) atom to form distorted corner-sharing OEr2Ni2 trigonal pyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent Er(1), one Ni(1), and one Ni(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Er(1), one Ni(1), and one Ni(2) atom.
ErNiO3 is Orthorhombic Perovskite structured and crystallizes in the monoclinic P2_1/c space group. Er(1) is bonded in a 8-coordinate geometry to two equivalent O(1), three equivalent O(2), and three equivalent O(3) atoms. There is one shorter (2.23 Å) and one longer (2.26 Å) Er(1)-O(1) bond length. There are a spread of Er(1)-O(2) bond distances ranging from 2.27-2.58 Å. There are a spread of Er(1)-O(3) bond distances ranging from 2.28-2.62 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 34-35°. Both Ni(1)-O(1) bond lengths are 1.98 Å. Both Ni(1)-O(2) bond lengths are 2.05 Å. Both Ni(1)-O(3) bond lengths are 2.02 Å. In the second Ni site, Ni(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 34-35°. Both Ni(2)-O(1) bond lengths are 1.91 Å. Both Ni(2)-O(2) bond lengths are 1.92 Å. Both Ni(2)-O(3) bond lengths are 1.97 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Er(1), one Ni(1), and one Ni(2) atom to form distorted corner-sharing OEr2Ni2 trigonal pyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent Er(1), one Ni(1), and one Ni(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Er(1), one Ni(1), and one Ni(2) atom.