The structure described by Na2Ti6O13 crystallizes in the monoclinic C2/m space group. Na(1) is bonded in a 4-coordinate geometry to two equivalent O(3) and two equivalent O(7) atoms. There are three inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(3), one O(6), one O(7), and three equivalent O(4) atoms to form a mixture of distorted edge and corner-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles are 34°. In the second Ti site, Ti(2) is bonded to one O(1), one O(5), one O(6), one O(7), and two equivalent O(2) atoms to form a mixture of edge and corner-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 0-28°. In the third Ti site, Ti(3) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and two equivalent O(6) atoms. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Ti(2) and one Ti(3) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Ti(3) and two equivalent Ti(2) atoms. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one Ti(1), and one Ti(3) atom. In the fourth O site, O(4) is bonded to one Ti(3) and three equivalent Ti(1) atoms to form distorted OTi4 trigonal pyramids that share corners with three equivalent O(7)Na2Ti2 tetrahedra,  a cornercorner with one O(6)Ti4 trigonal pyramid, corners with two equivalent O(4)Ti4 trigonal pyramids, edges with two equivalent O(4)Ti4 trigonal pyramids, and edges with two equivalent O(6)Ti4 trigonal pyramids. In the fifth O site, O(5) is bonded in a linear geometry to two equivalent Ti(2) atoms. In the sixth O site, O(6) is bonded to one Ti(1), one Ti(2), and two equivalent Ti(3) atoms to form distorted OTi4 trigonal pyramids that share  a cornercorner with one O(4)Ti4 trigonal pyramid, corners with two equivalent O(6)Ti4 trigonal pyramids,  an edgeedge with one O(7)Na2Ti2 tetrahedra, and edges with two equivalent O(4)Ti4 trigonal pyramids. In the seventh O site, O(7) is bonded to two equivalent Na(1), one Ti(1), and one Ti(2) atom to form ONa2Ti2 tetrahedra that share corners with two equivalent O(7)Na2Ti2 tetrahedra, corners with three equivalent O(4)Ti4 trigonal pyramids, and  an edgeedge with one O(6)Ti4 trigonal pyramid. is represented by the CIF card [CIF]
data_Na2Ti6O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.779
_cell_length_b   7.779
_cell_length_c   9.218
_cell_angle_alpha   81.353
_cell_angle_beta   81.353
_cell_angle_gamma   27.768
_symmetry_Int_Tables_number   1
_cell_volume   256.766
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Na  Na0  1  0.538  0.538  0.269  1.0
  Na  Na1  1  0.462  0.462  0.731  1.0
  Ti  Ti2  1  0.166  0.166  0.565  1.0
  Ti  Ti3  1  0.834  0.834  0.435  1.0
  Ti  Ti4  1  0.115  0.115  0.904  1.0
  Ti  Ti5  1  0.885  0.885  0.096  1.0
  Ti  Ti6  1  0.773  0.773  0.769  1.0
  Ti  Ti7  1  0.227  0.227  0.231  1.0
  O  O8  1  0.163  0.163  0.087  1.0
  O  O9  1  0.837  0.837  0.913  1.0
  O  O10  1  0.356  0.356  0.118  1.0
  O  O11  1  0.644  0.644  0.882  1.0
  O  O12  1  0.126  0.126  0.386  1.0
  O  O13  1  0.874  0.874  0.614  1.0
  O  O14  1  0.297  0.297  0.429  1.0
  O  O15  1  0.703  0.703  0.571  1.0
  O  O16  1  0.000  0.000  0.000  1.0
  O  O17  1  0.759  0.759  0.247  1.0
  O  O18  1  0.241  0.241  0.753  1.0
  O  O19  1  0.931  0.931  0.292  1.0
  O  O20  1  0.069  0.069  0.708  1.0
[/CIF]
.
The structure described by Na2Ti6O13 crystallizes in the monoclinic C2/m space group. Na(1) is bonded in a 4-coordinate geometry to two equivalent O(3) and two equivalent O(7) atoms. There are three inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(3), one O(6), one O(7), and three equivalent O(4) atoms to form a mixture of distorted edge and corner-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles are 34°. In the second Ti site, Ti(2) is bonded to one O(1), one O(5), one O(6), one O(7), and two equivalent O(2) atoms to form a mixture of edge and corner-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 0-28°. In the third Ti site, Ti(3) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and two equivalent O(6) atoms. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Ti(2) and one Ti(3) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Ti(3) and two equivalent Ti(2) atoms. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one Ti(1), and one Ti(3) atom. In the fourth O site, O(4) is bonded to one Ti(3) and three equivalent Ti(1) atoms to form distorted OTi4 trigonal pyramids that share corners with three equivalent O(7)Na2Ti2 tetrahedra,  a cornercorner with one O(6)Ti4 trigonal pyramid, corners with two equivalent O(4)Ti4 trigonal pyramids, edges with two equivalent O(4)Ti4 trigonal pyramids, and edges with two equivalent O(6)Ti4 trigonal pyramids. In the fifth O site, O(5) is bonded in a linear geometry to two equivalent Ti(2) atoms. In the sixth O site, O(6) is bonded to one Ti(1), one Ti(2), and two equivalent Ti(3) atoms to form distorted OTi4 trigonal pyramids that share  a cornercorner with one O(4)Ti4 trigonal pyramid, corners with two equivalent O(6)Ti4 trigonal pyramids,  an edgeedge with one O(7)Na2Ti2 tetrahedra, and edges with two equivalent O(4)Ti4 trigonal pyramids. In the seventh O site, O(7) is bonded to two equivalent Na(1), one Ti(1), and one Ti(2) atom to form ONa2Ti2 tetrahedra that share corners with two equivalent O(7)Na2Ti2 tetrahedra, corners with three equivalent O(4)Ti4 trigonal pyramids, and  an edgeedge with one O(6)Ti4 trigonal pyramid. is represented by the CIF card [CIF]
data_Na2Ti6O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.779
_cell_length_b   7.779
_cell_length_c   9.218
_cell_angle_alpha   81.353
_cell_angle_beta   81.353
_cell_angle_gamma   27.768
_symmetry_Int_Tables_number   1
_cell_volume   256.766
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Na  Na0  1  0.538  0.538  0.269  1.0
  Na  Na1  1  0.462  0.462  0.731  1.0
  Ti  Ti2  1  0.166  0.166  0.565  1.0
  Ti  Ti3  1  0.834  0.834  0.435  1.0
  Ti  Ti4  1  0.115  0.115  0.904  1.0
  Ti  Ti5  1  0.885  0.885  0.096  1.0
  Ti  Ti6  1  0.773  0.773  0.769  1.0
  Ti  Ti7  1  0.227  0.227  0.231  1.0
  O  O8  1  0.163  0.163  0.087  1.0
  O  O9  1  0.837  0.837  0.913  1.0
  O  O10  1  0.356  0.356  0.118  1.0
  O  O11  1  0.644  0.644  0.882  1.0
  O  O12  1  0.126  0.126  0.386  1.0
  O  O13  1  0.874  0.874  0.614  1.0
  O  O14  1  0.297  0.297  0.429  1.0
  O  O15  1  0.703  0.703  0.571  1.0
  O  O16  1  0.000  0.000  0.000  1.0
  O  O17  1  0.759  0.759  0.247  1.0
  O  O18  1  0.241  0.241  0.753  1.0
  O  O19  1  0.931  0.931  0.292  1.0
  O  O20  1  0.069  0.069  0.708  1.0
[/CIF]
.