NiMn2O4 is Spinel structured and crystallizes in the orthorhombic Fdd2 space group. Mn(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form MnO6 octahedra that share corners with six equivalent Ni(1)O4 tetrahedra and edges with six equivalent Mn(1)O6 octahedra. Ni(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form NiO4 tetrahedra that share corners with twelve equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-65°. There are two inequivalent O sites. In the first O site, O(2) is bonded in a rectangular see-saw-like geometry to three equivalent Mn(1) and one Ni(1) atom. In the second O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to three equivalent Mn(1) and one Ni(1) atom.
NiMn2O4 is Spinel structured and crystallizes in the orthorhombic Fdd2 space group. Mn(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form MnO6 octahedra that share corners with six equivalent Ni(1)O4 tetrahedra and edges with six equivalent Mn(1)O6 octahedra. There are a spread of Mn(1)-O(1) bond distances ranging from 1.96-2.28 Å. There are a spread of Mn(1)-O(2) bond distances ranging from 1.96-2.34 Å. Ni(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form NiO4 tetrahedra that share corners with twelve equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-65°. Both Ni(1)-O(1) bond lengths are 2.00 Å. Both Ni(1)-O(2) bond lengths are 2.01 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded in a rectangular see-saw-like geometry to three equivalent Mn(1) and one Ni(1) atom. In the second O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to three equivalent Mn(1) and one Ni(1) atom.