Na2Ti2O5 crystallizes in the monoclinic C2/m space group. Na(1) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. Ti(1) is bonded to one O(1), one O(3), and three equivalent O(2) atoms to form a mixture of distorted edge and corner-sharing TiO5 trigonal bipyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Na(1) and one Ti(1) atom. In the second O site, O(2) is bonded to one Na(1) and three equivalent Ti(1) atoms to form a mixture of edge and corner-sharing ONaTi3 tetrahedra. In the third O site, O(3) is bonded in a distorted linear geometry to four equivalent Na(1) and two equivalent Ti(1) atoms.
Na2Ti2O5 crystallizes in the monoclinic C2/m space group. Na(1) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. The Na(1)-O(2) bond length is 2.30 Å. Both Na(1)-O(1) bond lengths are 2.29 Å. Both Na(1)-O(3) bond lengths are 2.82 Å. Ti(1) is bonded to one O(1), one O(3), and three equivalent O(2) atoms to form a mixture of distorted edge and corner-sharing TiO5 trigonal bipyramids. The Ti(1)-O(1) bond length is 1.72 Å. The Ti(1)-O(3) bond length is 1.90 Å. There are two shorter (1.95 Å) and one longer (2.05 Å) Ti(1)-O(2) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Na(1) and one Ti(1) atom. In the second O site, O(2) is bonded to one Na(1) and three equivalent Ti(1) atoms to form a mixture of edge and corner-sharing ONaTi3 tetrahedra. In the third O site, O(3) is bonded in a distorted linear geometry to four equivalent Na(1) and two equivalent Ti(1) atoms.