MnNiO2 is Caswellsilverite-like structured and crystallizes in the tetragonal P4/mmm 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 six equivalent Mn(1)O6 octahedra, edges with four equivalent Mn(1)O6 octahedra, and edges with eight equivalent Ni(1)O6 octahedra. The corner-sharing octahedra are not tilted. Ni(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form NiO6 octahedra that share corners with six equivalent Ni(1)O6 octahedra, edges with four equivalent Ni(1)O6 octahedra, and edges with eight equivalent Mn(1)O6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mn(1) and four equivalent Ni(1) atoms to form OMn2Ni4 octahedra that share corners with six equivalent O(1)Mn2Ni4 octahedra, edges with four equivalent O(1)Mn2Ni4 octahedra, and edges with eight equivalent O(2)Mn4Ni2 octahedra. The corner-sharing octahedra are not tilted. In the second O site, O(2) is bonded to four equivalent Mn(1) and two equivalent Ni(1) atoms to form OMn4Ni2 octahedra that share corners with six equivalent O(2)Mn4Ni2 octahedra, edges with four equivalent O(2)Mn4Ni2 octahedra, and edges with eight equivalent O(1)Mn2Ni4 octahedra. The corner-sharing octahedra are not tilted.
MnNiO2 is Caswellsilverite-like structured and crystallizes in the tetragonal P4/mmm 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 six equivalent Mn(1)O6 octahedra, edges with four equivalent Mn(1)O6 octahedra, and edges with eight equivalent Ni(1)O6 octahedra. The corner-sharing octahedra are not tilted. Both Mn(1)-O(1) bond lengths are 2.19 Å. All Mn(1)-O(2) bond lengths are 2.19 Å. Ni(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form NiO6 octahedra that share corners with six equivalent Ni(1)O6 octahedra, edges with four equivalent Ni(1)O6 octahedra, and edges with eight equivalent Mn(1)O6 octahedra. The corner-sharing octahedra are not tilted. Both Ni(1)-O(2) bond lengths are 2.19 Å. All Ni(1)-O(1) bond lengths are 2.19 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mn(1) and four equivalent Ni(1) atoms to form OMn2Ni4 octahedra that share corners with six equivalent O(1)Mn2Ni4 octahedra, edges with four equivalent O(1)Mn2Ni4 octahedra, and edges with eight equivalent O(2)Mn4Ni2 octahedra. The corner-sharing octahedra are not tilted. In the second O site, O(2) is bonded to four equivalent Mn(1) and two equivalent Ni(1) atoms to form OMn4Ni2 octahedra that share corners with six equivalent O(2)Mn4Ni2 octahedra, edges with four equivalent O(2)Mn4Ni2 octahedra, and edges with eight equivalent O(1)Mn2Ni4 octahedra. The corner-sharing octahedra are not tilted.