Pr2NiO4 is Orthorhombic Perovskite-like structured and crystallizes in the orthorhombic Cmce space group. Pr(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. Ni(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles are 14°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to four equivalent Pr(1) and one Ni(1) atom. In the second O site, O(2) is bonded to four equivalent Pr(1) and two equivalent Ni(1) atoms to form a mixture of distorted edge, corner, and face-sharing OPr4Ni2 octahedra. The corner-sharing octahedra are not tilted.
Pr2NiO4 is Orthorhombic Perovskite-like structured and crystallizes in the orthorhombic Cmce space group. Pr(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. There are a spread of Pr(1)-O(1) bond distances ranging from 2.32-2.79 Å. There are two shorter (2.50 Å) and two longer (2.71 Å) Pr(1)-O(2) bond lengths. Ni(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles are 14°. Both Ni(1)-O(1) bond lengths are 2.24 Å. All Ni(1)-O(2) bond lengths are 1.99 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to four equivalent Pr(1) and one Ni(1) atom. In the second O site, O(2) is bonded to four equivalent Pr(1) and two equivalent Ni(1) atoms to form a mixture of distorted edge, corner, and face-sharing OPr4Ni2 octahedra. The corner-sharing octahedra are not tilted.