NaMgCoO2 is Hausmannite-derived structured and crystallizes in the monoclinic Cm space group. Na(1) is bonded in a distorted rectangular see-saw-like geometry to one Co(1) and three equivalent O(1) atoms. Mg(1) is bonded to one O(2) and three equivalent O(1) atoms to form corner-sharing MgO4 tetrahedra. Co(1) is bonded in a 3-coordinate geometry to one Na(1) and three equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Na(1) and three equivalent Mg(1) atoms to form distorted ONa3Mg3 octahedra that share corners with three equivalent O(2)MgCo3 tetrahedra and edges with six equivalent O(1)Na3Mg3 octahedra. In the second O site, O(2) is bonded to one Mg(1) and three equivalent Co(1) atoms to form OMgCo3 tetrahedra that share corners with three equivalent O(1)Na3Mg3 octahedra and corners with six equivalent O(2)MgCo3 tetrahedra. The corner-sharing octahedral tilt angles range from 67-68°.
NaMgCoO2 is Hausmannite-derived structured and crystallizes in the monoclinic Cm space group. Na(1) is bonded in a distorted rectangular see-saw-like geometry to one Co(1) and three equivalent O(1) atoms. The Na(1)-Co(1) bond length is 2.87 Å. All Na(1)-O(1) bond lengths are 2.44 Å. Mg(1) is bonded to one O(2) and three equivalent O(1) atoms to form corner-sharing MgO4 tetrahedra. The Mg(1)-O(2) bond length is 1.98 Å. All Mg(1)-O(1) bond lengths are 2.07 Å. Co(1) is bonded in a 3-coordinate geometry to one Na(1) and three equivalent O(2) atoms. All Co(1)-O(2) bond lengths are 1.95 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Na(1) and three equivalent Mg(1) atoms to form distorted ONa3Mg3 octahedra that share corners with three equivalent O(2)MgCo3 tetrahedra and edges with six equivalent O(1)Na3Mg3 octahedra. In the second O site, O(2) is bonded to one Mg(1) and three equivalent Co(1) atoms to form OMgCo3 tetrahedra that share corners with three equivalent O(1)Na3Mg3 octahedra and corners with six equivalent O(2)MgCo3 tetrahedra. The corner-sharing octahedral tilt angles range from 67-68°.