The structure described by Na5Ti2Si2PO13 is Esseneite-derived structured and crystallizes in the triclinic P-1 space group. There are five inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(5), and one O(7) atom. In the second Na site, Na(2) is bonded to one O(1), one O(11), one O(2), and one O(3) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(5)O8 hexagonal bipyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one Na(5)O8 hexagonal bipyramid. In the third Na site, Na(3) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(3), one O(5), one O(7), and one O(8) atom. In the fourth Na site, Na(4) is bonded in a 6-coordinate geometry to one O(4), one O(9), two equivalent O(12), and two equivalent O(6) atoms. In the fifth Na site, Na(5) is bonded to one O(10), one O(13), one O(2), one O(4), one O(7), one O(8), and two equivalent O(11) atoms to form distorted NaO8 hexagonal bipyramids that share corners with two equivalent Na(5)O8 hexagonal bipyramids, corners with two equivalent Ti(1)O6 octahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one P(1)O4 tetrahedra, edges with two equivalent Ti(2)O6 octahedra,  an edgeedge with one Na(2)O4 tetrahedra, edges with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-59°. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(12), one O(6), two equivalent O(4), and two equivalent O(9) atoms to form TiO6 octahedra that share corners with two equivalent Na(5)O8 hexagonal bipyramids,  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles are 39°. In the second Ti site, Ti(2) is bonded to one O(10), one O(13), one O(5), one O(6), one O(7), and one O(8) atom to form TiO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and edges with two equivalent Na(5)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 39°. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(7), one O(8), and one O(9) atom to form SiO4 tetrahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and edges with two equivalent Na(5)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 34-58°. In the second Si site, Si(2) is bonded to one O(10), one O(11), one O(12), and one O(13) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, and edges with two equivalent Na(5)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 13-50°. P(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Na(5)O8 hexagonal bipyramid,  a cornercorner with one Ti(2)O6 octahedra, and corners with three equivalent Na(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 45°. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Na(3), and one P(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Na(5), and one P(1) atom. In the third O site, O(3) is bonded in a distorted tetrahedral geometry to one Na(1), one Na(2), one Na(3), and one P(1) atom. In the fourth O site, O(4) is bonded to one Na(4), one Na(5), and two equivalent Ti(1) atoms to form distorted edge-sharing ONa2Ti2 tetrahedra. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Ti(2), and one P(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Na(4), one Ti(1), and one Ti(2) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Na(1), one Na(3), one Na(5), one Ti(2), and one Si(1) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Na(3), one Na(5), one Ti(2), and one Si(1) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Na(4), two equivalent Ti(1), and one Si(1) atom. In the tenth O site, O(10) is bonded in a 2-coordinate geometry to one Na(3), one Na(5), one Ti(2), and one Si(2) atom. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one Na(2), two equivalent Na(5), one Si(1), and one Si(2) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to two equivalent Na(4), one Ti(1), and one Si(2) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Na(5), one Ti(2), and one Si(2) atom. is represented by the CIF card [CIF]
data_Na5Ti2Si2PO13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.461
_cell_length_b   7.159
_cell_length_c   14.699
_cell_angle_alpha   100.012
_cell_angle_beta   96.560
_cell_angle_gamma   90.566
_symmetry_Int_Tables_number   1
_cell_volume   561.866
_cell_formula_units_Z   2
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  0.756  0.256  0.581  1.0
  Na  Na1  1  0.244  0.744  0.419  1.0
  Na  Na2  1  0.326  0.540  0.605  1.0
  Na  Na3  1  0.674  0.460  0.395  1.0
  Na  Na4  1  0.321  0.033  0.638  1.0
  Na  Na5  1  0.679  0.967  0.362  1.0
  Na  Na6  1  0.754  0.877  0.001  1.0
  Na  Na7  1  0.173  0.421  0.232  1.0
  Na  Na8  1  0.827  0.579  0.768  1.0
  Na  Na9  1  0.246  0.123  0.999  1.0
  Ti  Ti10  1  0.779  0.382  0.990  1.0
  Ti  Ti11  1  0.221  0.618  0.010  1.0
  Ti  Ti12  1  0.829  0.070  0.779  1.0
  Ti  Ti13  1  0.171  0.930  0.221  1.0
  Si  Si14  1  0.353  0.358  0.803  1.0
  Si  Si15  1  0.328  0.795  0.824  1.0
  Si  Si16  1  0.647  0.642  0.197  1.0
  Si  Si17  1  0.672  0.205  0.176  1.0
  P  P18  1  0.178  0.227  0.430  1.0
  P  P19  1  0.822  0.773  0.570  1.0
  O  O20  1  0.670  0.770  0.474  1.0
  O  O21  1  0.330  0.230  0.526  1.0
  O  O22  1  0.748  0.599  0.612  1.0
  O  O23  1  0.252  0.401  0.388  1.0
  O  O24  1  0.101  0.774  0.560  1.0
  O  O25  1  0.899  0.226  0.440  1.0
  O  O26  1  0.918  0.578  0.933  1.0
  O  O27  1  0.082  0.422  0.067  1.0
  O  O28  1  0.766  0.965  0.636  1.0
  O  O29  1  0.234  0.035  0.364  1.0
  O  O30  1  0.862  0.173  0.908  1.0
  O  O31  1  0.138  0.827  0.092  1.0
  O  O32  1  0.587  0.269  0.751  1.0
  O  O33  1  0.413  0.731  0.249  1.0
  O  O34  1  0.098  0.241  0.758  1.0
  O  O35  1  0.902  0.759  0.242  1.0
  O  O36  1  0.413  0.394  0.918  1.0
  O  O37  1  0.587  0.606  0.082  1.0
  O  O38  1  0.555  0.902  0.791  1.0
  O  O39  1  0.445  0.098  0.209  1.0
  O  O40  1  0.679  0.430  0.230  1.0
  O  O41  1  0.321  0.570  0.770  1.0
  O  O42  1  0.641  0.200  0.064  1.0
  O  O43  1  0.359  0.800  0.936  1.0
  O  O44  1  0.940  0.124  0.208  1.0
  O  O45  1  0.060  0.876  0.792  1.0
[/CIF]
.
The structure described by Na5Ti2Si2PO13 is Esseneite-derived structured and crystallizes in the triclinic P-1 space group. There are five inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(5), and one O(7) atom. In the second Na site, Na(2) is bonded to one O(1), one O(11), one O(2), and one O(3) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(5)O8 hexagonal bipyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one Na(5)O8 hexagonal bipyramid. In the third Na site, Na(3) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(3), one O(5), one O(7), and one O(8) atom. In the fourth Na site, Na(4) is bonded in a 6-coordinate geometry to one O(4), one O(9), two equivalent O(12), and two equivalent O(6) atoms. In the fifth Na site, Na(5) is bonded to one O(10), one O(13), one O(2), one O(4), one O(7), one O(8), and two equivalent O(11) atoms to form distorted NaO8 hexagonal bipyramids that share corners with two equivalent Na(5)O8 hexagonal bipyramids, corners with two equivalent Ti(1)O6 octahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one P(1)O4 tetrahedra, edges with two equivalent Ti(2)O6 octahedra,  an edgeedge with one Na(2)O4 tetrahedra, edges with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-59°. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(12), one O(6), two equivalent O(4), and two equivalent O(9) atoms to form TiO6 octahedra that share corners with two equivalent Na(5)O8 hexagonal bipyramids,  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles are 39°. In the second Ti site, Ti(2) is bonded to one O(10), one O(13), one O(5), one O(6), one O(7), and one O(8) atom to form TiO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and edges with two equivalent Na(5)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 39°. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(7), one O(8), and one O(9) atom to form SiO4 tetrahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and edges with two equivalent Na(5)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 34-58°. In the second Si site, Si(2) is bonded to one O(10), one O(11), one O(12), and one O(13) atom to form SiO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra,  a cornercorner with one Na(2)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, and edges with two equivalent Na(5)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 13-50°. P(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Na(5)O8 hexagonal bipyramid,  a cornercorner with one Ti(2)O6 octahedra, and corners with three equivalent Na(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 45°. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Na(3), and one P(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Na(5), and one P(1) atom. In the third O site, O(3) is bonded in a distorted tetrahedral geometry to one Na(1), one Na(2), one Na(3), and one P(1) atom. In the fourth O site, O(4) is bonded to one Na(4), one Na(5), and two equivalent Ti(1) atoms to form distorted edge-sharing ONa2Ti2 tetrahedra. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Ti(2), and one P(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Na(4), one Ti(1), and one Ti(2) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Na(1), one Na(3), one Na(5), one Ti(2), and one Si(1) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Na(3), one Na(5), one Ti(2), and one Si(1) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Na(4), two equivalent Ti(1), and one Si(1) atom. In the tenth O site, O(10) is bonded in a 2-coordinate geometry to one Na(3), one Na(5), one Ti(2), and one Si(2) atom. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one Na(2), two equivalent Na(5), one Si(1), and one Si(2) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to two equivalent Na(4), one Ti(1), and one Si(2) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Na(5), one Ti(2), and one Si(2) atom. is represented by the CIF card [CIF]
data_Na5Ti2Si2PO13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.461
_cell_length_b   7.159
_cell_length_c   14.699
_cell_angle_alpha   100.012
_cell_angle_beta   96.560
_cell_angle_gamma   90.566
_symmetry_Int_Tables_number   1
_cell_volume   561.866
_cell_formula_units_Z   2
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  0.756  0.256  0.581  1.0
  Na  Na1  1  0.244  0.744  0.419  1.0
  Na  Na2  1  0.326  0.540  0.605  1.0
  Na  Na3  1  0.674  0.460  0.395  1.0
  Na  Na4  1  0.321  0.033  0.638  1.0
  Na  Na5  1  0.679  0.967  0.362  1.0
  Na  Na6  1  0.754  0.877  0.001  1.0
  Na  Na7  1  0.173  0.421  0.232  1.0
  Na  Na8  1  0.827  0.579  0.768  1.0
  Na  Na9  1  0.246  0.123  0.999  1.0
  Ti  Ti10  1  0.779  0.382  0.990  1.0
  Ti  Ti11  1  0.221  0.618  0.010  1.0
  Ti  Ti12  1  0.829  0.070  0.779  1.0
  Ti  Ti13  1  0.171  0.930  0.221  1.0
  Si  Si14  1  0.353  0.358  0.803  1.0
  Si  Si15  1  0.328  0.795  0.824  1.0
  Si  Si16  1  0.647  0.642  0.197  1.0
  Si  Si17  1  0.672  0.205  0.176  1.0
  P  P18  1  0.178  0.227  0.430  1.0
  P  P19  1  0.822  0.773  0.570  1.0
  O  O20  1  0.670  0.770  0.474  1.0
  O  O21  1  0.330  0.230  0.526  1.0
  O  O22  1  0.748  0.599  0.612  1.0
  O  O23  1  0.252  0.401  0.388  1.0
  O  O24  1  0.101  0.774  0.560  1.0
  O  O25  1  0.899  0.226  0.440  1.0
  O  O26  1  0.918  0.578  0.933  1.0
  O  O27  1  0.082  0.422  0.067  1.0
  O  O28  1  0.766  0.965  0.636  1.0
  O  O29  1  0.234  0.035  0.364  1.0
  O  O30  1  0.862  0.173  0.908  1.0
  O  O31  1  0.138  0.827  0.092  1.0
  O  O32  1  0.587  0.269  0.751  1.0
  O  O33  1  0.413  0.731  0.249  1.0
  O  O34  1  0.098  0.241  0.758  1.0
  O  O35  1  0.902  0.759  0.242  1.0
  O  O36  1  0.413  0.394  0.918  1.0
  O  O37  1  0.587  0.606  0.082  1.0
  O  O38  1  0.555  0.902  0.791  1.0
  O  O39  1  0.445  0.098  0.209  1.0
  O  O40  1  0.679  0.430  0.230  1.0
  O  O41  1  0.321  0.570  0.770  1.0
  O  O42  1  0.641  0.200  0.064  1.0
  O  O43  1  0.359  0.800  0.936  1.0
  O  O44  1  0.940  0.124  0.208  1.0
  O  O45  1  0.060  0.876  0.792  1.0
[/CIF]
.