Mn2NiO3 is Caswellsilverite-like structured and crystallizes in the orthorhombic Immm space group. Mn(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form MnO6 octahedra that share corners with two equivalent Ni(1)O6 octahedra, corners with four equivalent Mn(1)O6 octahedra, edges with five equivalent Ni(1)O6 octahedra, and edges with seven equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. Ni(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form NiO6 octahedra that share corners with two equivalent Ni(1)O6 octahedra, corners with four equivalent Mn(1)O6 octahedra, edges with two equivalent Ni(1)O6 octahedra, and edges with ten equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Mn(1) and two equivalent Ni(1) atoms to form a mixture of corner and edge-sharing OMn4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the second O site, O(2) is bonded to four equivalent Mn(1) and two equivalent Ni(1) atoms to form a mixture of corner and edge-sharing OMn4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 0-3°.
Mn2NiO3 is Caswellsilverite-like structured and crystallizes in the orthorhombic Immm space group. Mn(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form MnO6 octahedra that share corners with two equivalent Ni(1)O6 octahedra, corners with four equivalent Mn(1)O6 octahedra, edges with five equivalent Ni(1)O6 octahedra, and edges with seven equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. Both Mn(1)-O(1) bond lengths are 2.19 Å. There are two shorter (2.21 Å) and two longer (2.27 Å) Mn(1)-O(2) bond lengths. Ni(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form NiO6 octahedra that share corners with two equivalent Ni(1)O6 octahedra, corners with four equivalent Mn(1)O6 octahedra, edges with two equivalent Ni(1)O6 octahedra, and edges with ten equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. Both Ni(1)-O(1) bond lengths are 2.21 Å. All Ni(1)-O(2) bond lengths are 2.15 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Mn(1) and two equivalent Ni(1) atoms to form a mixture of corner and edge-sharing OMn4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the second O site, O(2) is bonded to four equivalent Mn(1) and two equivalent Ni(1) atoms to form a mixture of corner and edge-sharing OMn4Ni2 octahedra. The corner-sharing octahedral tilt angles range from 0-3°.