Na8MgTi2O8 crystallizes in the monoclinic C2/m space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(3) atoms. In the second Na site, Na(2) is bonded in a distorted water-like geometry to two equivalent O(2) atoms. In the third Na site, Na(3) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), and two equivalent O(1) atoms. Mg(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. Ti(1) is bonded in a tetrahedral 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), two equivalent Na(3), one Mg(1), and one Ti(1) atom to form a mixture of distorted corner and edge-sharing ONa3MgTi square pyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Na(2), two equivalent Na(3), and one Ti(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Na(1), two equivalent Na(3), and one Ti(1) atom.
Na8MgTi2O8 crystallizes in the monoclinic C2/m space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(3) atoms. Both Na(1)-O(1) bond lengths are 2.33 Å. Both Na(1)-O(3) bond lengths are 2.31 Å. In the second Na site, Na(2) is bonded in a distorted water-like geometry to two equivalent O(2) atoms. Both Na(2)-O(2) bond lengths are 2.43 Å. In the third Na site, Na(3) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), and two equivalent O(1) atoms. The Na(3)-O(2) bond length is 2.39 Å. The Na(3)-O(3) bond length is 2.54 Å. There is one shorter (2.33 Å) and one longer (2.63 Å) Na(3)-O(1) bond length. Mg(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. All Mg(1)-O(1) bond lengths are 2.09 Å. Ti(1) is bonded in a tetrahedral geometry to one O(2), one O(3), and two equivalent O(1) atoms. The Ti(1)-O(2) bond length is 1.85 Å. The Ti(1)-O(3) bond length is 1.81 Å. Both Ti(1)-O(1) bond lengths are 1.86 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), two equivalent Na(3), one Mg(1), and one Ti(1) atom to form a mixture of distorted corner and edge-sharing ONa3MgTi square pyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Na(2), two equivalent Na(3), and one Ti(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Na(1), two equivalent Na(3), and one Ti(1) atom.