NaMgNiO2 crystallizes in the monoclinic Cm space group. Na(1) is bonded in a 2-coordinate geometry to one O(2) and three equivalent O(1) atoms. Mg(1) is bonded to one O(1) and three equivalent O(2) atoms to form corner-sharing MgO4 tetrahedra. Ni(1) is bonded in a distorted trigonal planar geometry to three equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to three equivalent Na(1), one Mg(1), and three equivalent Ni(1) atoms. In the second O site, O(2) is bonded to one Na(1) and three equivalent Mg(1) atoms to form corner-sharing ONaMg3 tetrahedra.
NaMgNiO2 crystallizes in the monoclinic Cm space group. Na(1) is bonded in a 2-coordinate geometry to one O(2) and three equivalent O(1) atoms. The Na(1)-O(2) bond length is 2.26 Å. There is one shorter (2.47 Å) and two longer (2.81 Å) Na(1)-O(1) bond lengths. Mg(1) is bonded to one O(1) and three equivalent O(2) atoms to form corner-sharing MgO4 tetrahedra. The Mg(1)-O(1) bond length is 2.13 Å. There is one shorter (2.04 Å) and two longer (2.05 Å) Mg(1)-O(2) bond lengths. Ni(1) is bonded in a distorted trigonal planar geometry to three equivalent O(1) atoms. There are two shorter (1.93 Å) and one longer (2.01 Å) Ni(1)-O(1) bond length. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to three equivalent Na(1), one Mg(1), and three equivalent Ni(1) atoms. In the second O site, O(2) is bonded to one Na(1) and three equivalent Mg(1) atoms to form corner-sharing ONaMg3 tetrahedra.