Na2MgV2Cd2O8 crystallizes in the monoclinic C2/m space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form NaO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, and edges with two equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 5°. In the second Na site, Na(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form NaO6 octahedra that share corners with four equivalent Mg(1)O6 octahedra and edges with two equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles are 13°. Mg(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form distorted MgO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with four equivalent Na(2)O6 octahedra, and edges with two equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 5-13°. V(1) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), and two equivalent O(1) atoms. Cd(1) is bonded in a 4-coordinate geometry to one O(2), one O(3), and two equivalent O(1) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(2), one Mg(1), one V(1), and one Cd(1) atom to form a mixture of distorted face, corner, and edge-sharing ONa2MgVCd trigonal bipyramids. In the second O site, O(2) is bonded in a trigonal planar geometry to one Na(2), one V(1), and one Cd(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), one Mg(1), one V(1), and one Cd(1) atom.
Na2MgV2Cd2O8 crystallizes in the monoclinic C2/m space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form NaO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, and edges with two equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 5°. Both Na(1)-O(3) bond lengths are 2.73 Å. All Na(1)-O(1) bond lengths are 2.50 Å. In the second Na site, Na(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form NaO6 octahedra that share corners with four equivalent Mg(1)O6 octahedra and edges with two equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles are 13°. Both Na(2)-O(2) bond lengths are 2.27 Å. All Na(2)-O(1) bond lengths are 2.71 Å. Mg(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form distorted MgO6 octahedra that share corners with two equivalent Na(1)O6 octahedra, corners with four equivalent Na(2)O6 octahedra, and edges with two equivalent Na(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 5-13°. Both Mg(1)-O(3) bond lengths are 2.17 Å. All Mg(1)-O(1) bond lengths are 2.13 Å. V(1) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), and two equivalent O(1) atoms. The V(1)-O(2) bond length is 1.79 Å. The V(1)-O(3) bond length is 1.79 Å. Both V(1)-O(1) bond lengths are 1.89 Å. Cd(1) is bonded in a 4-coordinate geometry to one O(2), one O(3), and two equivalent O(1) atoms. The Cd(1)-O(2) bond length is 2.12 Å. The Cd(1)-O(3) bond length is 2.35 Å. Both Cd(1)-O(1) bond lengths are 2.35 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(2), one Mg(1), one V(1), and one Cd(1) atom to form a mixture of distorted face, corner, and edge-sharing ONa2MgVCd trigonal bipyramids. In the second O site, O(2) is bonded in a trigonal planar geometry to one Na(2), one V(1), and one Cd(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), one Mg(1), one V(1), and one Cd(1) atom.