The material structure described by Na11TiNb2Si4(PO13)2 is Esseneite-derived structured and crystallizes in the triclinic P1 space group. There are eleven inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(17), one O(18), one O(21), one O(22), one O(23), and one O(26) atom to form NaO6 octahedra that share  a cornercorner with one Na(3)O8 hexagonal bipyramid,  a cornercorner with one Na(4)O8 hexagonal bipyramid,  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, and edges with two equivalent Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-61°. In the second Na site, Na(2) is bonded to one O(17), one O(18), one O(21), one O(22), one O(24), and one O(25) atom to form NaO6 octahedra that share  a cornercorner with one Na(3)O8 hexagonal bipyramid,  a cornercorner with one Na(4)O8 hexagonal bipyramid,  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, and edges with two equivalent Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-61°. In the third Na site, Na(3) is bonded to one O(12), one O(16), one O(18), one O(5), one O(8), one O(9), and two equivalent O(19) atoms to form distorted NaO8 hexagonal bipyramids that share corners with two equivalent Na(3)O8 hexagonal bipyramids,  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, edges with two equivalent Nb(2)O6 octahedra,  an edgeedge with one Na(10)O4 tetrahedra, edges with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 46-70°. In the fourth Na site, Na(4) is bonded to one O(10), one O(11), one O(15), one O(17), one O(6), one O(7), and two equivalent O(20) atoms to form distorted NaO8 hexagonal bipyramids that share corners with two equivalent Na(4)O8 hexagonal bipyramids,  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one P(1)O4 tetrahedra, edges with two equivalent Nb(1)O6 octahedra,  an edgeedge with one Na(11)O4 tetrahedra, edges with two equivalent Si(2)O4 tetrahedra, and edges with two equivalent Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-67°. In the fifth Na site, Na(5) is bonded in a 6-coordinate geometry to one O(12), one O(13), one O(2), one O(3), one O(5), and one O(8) atom. In the sixth Na site, Na(6) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(14), one O(4), one O(6), and one O(7) atom. In the seventh Na site, Na(7) is bonded to one O(21), one O(22), one O(23), one O(24), one O(25), and one O(26) atom to form distorted NaO6 octahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, and edges with two equivalent Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles are 53°. In the eighth Na site, Na(8) is bonded in a 4-coordinate geometry to one O(1), one O(14), one O(15), one O(3), and one O(7) atom. In the ninth Na site, Na(9) is bonded in a 4-coordinate geometry to one O(13), one O(16), one O(2), one O(4), and one O(8) atom. In the tenth Na site, Na(10) is bonded to one O(13), one O(16), one O(19), and one O(3) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(3)O8 hexagonal bipyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and  an edgeedge with one Na(3)O8 hexagonal bipyramid. In the eleventh Na site, Na(11) is bonded to one O(14), one O(15), one O(20), and one O(4) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(4)O8 hexagonal bipyramid,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and  an edgeedge with one Na(4)O8 hexagonal bipyramid. Ti(1) is bonded to one O(17), one O(18), one O(23), one O(24), one O(25), and one O(26) atom to form TiO6 octahedra that share  a cornercorner with one Na(3)O8 hexagonal bipyramid,  a cornercorner with one Na(4)O8 hexagonal bipyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, and edges with two equivalent Na(7)O6 octahedra. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(10), one O(11), one O(21), one O(6), and one O(7) atom to form distorted NbO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra, and edges with two equivalent Na(4)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 53-61°. In the second Nb site, Nb(2) is bonded to one O(12), one O(2), one O(22), one O(5), one O(8), and one O(9) atom to form distorted NbO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, and edges with two equivalent Na(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 53-61°. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(12), one O(19), one O(25), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one Ti(1)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra,  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and edges with two equivalent Na(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 28-68°. In the second Si site, Si(2) is bonded to one O(10), one O(11), one O(20), and one O(26) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one Ti(1)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra,  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and edges with two equivalent Na(4)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 28-67°. In the third Si site, Si(3) is bonded to one O(19), one O(23), one O(5), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one Ti(1)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra,  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, and edges with two equivalent Na(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 37-61°. In the fourth Si site, Si(4) is bonded to one O(20), one O(24), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one Ti(1)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra,  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and edges with two equivalent Na(4)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 37-62°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(13), one O(15), and one O(4) atom to form PO4 tetrahedra that share  a cornercorner with one Na(4)O8 hexagonal bipyramid,  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Na(10)O4 tetrahedra, and corners with two equivalent Na(11)O4 tetrahedra. The corner-sharing octahedral tilt angles are 46°. In the second P site, P(2) is bonded to one O(14), one O(16), one O(2), and one O(3) atom to form PO4 tetrahedra that share  a cornercorner with one Na(3)O8 hexagonal bipyramid,  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Na(11)O4 tetrahedra, and corners with two equivalent Na(10)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. There are twenty-six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(6), one Na(8), one Nb(1), and one P(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(5), one Na(9), one Nb(2), and one P(2) atom. In the third O site, O(3) is bonded in a distorted tetrahedral geometry to one Na(10), one Na(5), one Na(8), and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted tetrahedral geometry to one Na(11), one Na(6), one Na(9), and one P(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Na(3), one Na(5), one Nb(2), and one Si(3) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Na(4), one Na(6), one Nb(1), and one Si(4) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Na(4), one Na(6), one Na(8), one Nb(1), and one Si(4) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Na(3), one Na(5), one Na(9), one Nb(2), and one Si(3) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Na(3), one Nb(2), and one Si(1) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Na(4), one Nb(1), and one Si(2) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Na(4), one Na(6), one Nb(1), and one Si(2) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Na(3), one Na(5), one Nb(2), and one Si(1) atom. In the thirteenth O site, O(13) is bonded in a distorted rectangular see-saw-like geometry to one Na(10), one Na(5), one Na(9), and one P(1) atom. In the fourteenth O site, O(14) is bonded in a distorted rectangular see-saw-like geometry to one Na(11), one Na(6), one Na(8), and one P(2) atom. In the fifteenth O site, O(15) is bonded in a distorted rectangular see-saw-like geometry to one Na(11), one Na(4), one Na(8), and one P(1) atom. In the sixteenth O site, O(16) is bonded in a distorted rectangular see-saw-like geometry to one Na(10), one Na(3), one Na(9), and one P(2) atom. In the seventeenth O site, O(17) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Na(4), and one Ti(1) atom. In the eighteenth O site, O(18) is bonded to one Na(1), one Na(2), one Na(3), and one Ti(1) atom to form distorted corner-sharing ONa3Ti tetrahedra. In the nineteenth O site, O(19) is bonded in a 5-coordinate geometry to one Na(10), two equivalent Na(3), one Si(1), and one Si(3) atom. In the twentieth O site, O(20) is bonded in a 5-coordinate geometry to one Na(11), two equivalent Na(4), one Si(2), and one Si(4) atom. In the twenty-first O site, O(21) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Na(7), and one Nb(1) atom. In the twenty-second O site, O(22) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Na(7), and one Nb(2) atom. In the twenty-third O site, O(23) is bonded in a 4-coordinate geometry to one Na(1), one Na(7), one Ti(1), and one Si(3) atom. In the twenty-fourth O site, O(24) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Na(7), one Ti(1), and one Si(4) atom. In the twenty-fifth O site, O(25) is bonded to one Na(2), one Na(7), one Ti(1), and one Si(1) atom to form distorted corner-sharing ONa2TiSi tetrahedra. In the twenty-sixth O site, O(26) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(7), one Ti(1), and one Si(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na11TiNb2Si4(PO13)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.575
_cell_length_b   7.247
_cell_length_c   14.714
_cell_angle_alpha   92.588
_cell_angle_beta   95.400
_cell_angle_gamma   90.551
_symmetry_Int_Tables_number   1
_cell_volume   591.129
_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  0.506  0.761  0.497  1.0
  Na  Na1  1  0.496  0.242  0.500  1.0
  Na  Na2  1  0.295  0.009  0.265  1.0
  Na  Na3  1  0.705  0.991  0.736  1.0
  Na  Na4  1  0.805  0.493  0.134  1.0
  Na  Na5  1  0.195  0.507  0.866  1.0
  Na  Na6  1  1.000  0.500  0.500  1.0
  Na  Na7  1  0.753  0.264  0.922  1.0
  Na  Na8  1  0.247  0.736  0.078  1.0
  Na  Na9  1  0.818  0.018  0.100  1.0
  Na  Na10  1  0.182  0.982  0.900  1.0
  Ti  Ti11  1  0.026  0.001  0.492  1.0
  Nb  Nb12  1  0.698  0.507  0.716  1.0
  Nb  Nb13  1  0.302  0.492  0.284  1.0
  Si  Si14  1  0.802  0.205  0.316  1.0
  Si  Si15  1  0.196  0.796  0.685  1.0
  Si  Si16  1  0.817  0.781  0.304  1.0
  Si  Si17  1  0.183  0.218  0.695  1.0
  P  P18  1  0.687  0.744  0.934  1.0
  P  P19  1  0.313  0.256  0.067  1.0
  O  O20  1  0.744  0.570  0.870  1.0
  O  O21  1  0.255  0.430  0.130  1.0
  O  O22  1  0.588  0.257  0.057  1.0
  O  O23  1  0.412  0.743  0.943  1.0
  O  O24  1  0.567  0.677  0.258  1.0
  O  O25  1  0.433  0.323  0.742  1.0
  O  O26  1  0.950  0.304  0.744  1.0
  O  O27  1  0.050  0.697  0.255  1.0
  O  O28  1  0.542  0.290  0.281  1.0
  O  O29  1  0.458  0.711  0.718  1.0
  O  O30  1  0.982  0.685  0.728  1.0
  O  O31  1  0.017  0.314  0.273  1.0
  O  O32  1  0.829  0.726  0.029  1.0
  O  O33  1  0.170  0.274  0.971  1.0
  O  O34  1  0.764  0.927  0.892  1.0
  O  O35  1  0.236  0.073  0.108  1.0
  O  O36  1  0.741  0.991  0.579  1.0
  O  O37  1  0.266  0.003  0.424  1.0
  O  O38  1  0.796  0.994  0.265  1.0
  O  O39  1  0.204  0.006  0.735  1.0
  O  O40  1  0.678  0.484  0.593  1.0
  O  O41  1  0.322  0.515  0.407  1.0
  O  O42  1  0.842  0.790  0.414  1.0
  O  O43  1  0.164  0.211  0.585  1.0
  O  O44  1  0.837  0.199  0.426  1.0
  O  O45  1  0.153  0.802  0.574  1.0
[/CIF]
.
The material structure described by Na11TiNb2Si4(PO13)2 is Esseneite-derived structured and crystallizes in the triclinic P1 space group. There are eleven inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(17), one O(18), one O(21), one O(22), one O(23), and one O(26) atom to form NaO6 octahedra that share  a cornercorner with one Na(3)O8 hexagonal bipyramid,  a cornercorner with one Na(4)O8 hexagonal bipyramid,  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, and edges with two equivalent Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-61°. In the second Na site, Na(2) is bonded to one O(17), one O(18), one O(21), one O(22), one O(24), and one O(25) atom to form NaO6 octahedra that share  a cornercorner with one Na(3)O8 hexagonal bipyramid,  a cornercorner with one Na(4)O8 hexagonal bipyramid,  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(7)O6 octahedra, and edges with two equivalent Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-61°. In the third Na site, Na(3) is bonded to one O(12), one O(16), one O(18), one O(5), one O(8), one O(9), and two equivalent O(19) atoms to form distorted NaO8 hexagonal bipyramids that share corners with two equivalent Na(3)O8 hexagonal bipyramids,  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, edges with two equivalent Nb(2)O6 octahedra,  an edgeedge with one Na(10)O4 tetrahedra, edges with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 46-70°. In the fourth Na site, Na(4) is bonded to one O(10), one O(11), one O(15), one O(17), one O(6), one O(7), and two equivalent O(20) atoms to form distorted NaO8 hexagonal bipyramids that share corners with two equivalent Na(4)O8 hexagonal bipyramids,  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one P(1)O4 tetrahedra, edges with two equivalent Nb(1)O6 octahedra,  an edgeedge with one Na(11)O4 tetrahedra, edges with two equivalent Si(2)O4 tetrahedra, and edges with two equivalent Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-67°. In the fifth Na site, Na(5) is bonded in a 6-coordinate geometry to one O(12), one O(13), one O(2), one O(3), one O(5), and one O(8) atom. In the sixth Na site, Na(6) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(14), one O(4), one O(6), and one O(7) atom. In the seventh Na site, Na(7) is bonded to one O(21), one O(22), one O(23), one O(24), one O(25), and one O(26) atom to form distorted NaO6 octahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, and edges with two equivalent Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles are 53°. In the eighth Na site, Na(8) is bonded in a 4-coordinate geometry to one O(1), one O(14), one O(15), one O(3), and one O(7) atom. In the ninth Na site, Na(9) is bonded in a 4-coordinate geometry to one O(13), one O(16), one O(2), one O(4), and one O(8) atom. In the tenth Na site, Na(10) is bonded to one O(13), one O(16), one O(19), and one O(3) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(3)O8 hexagonal bipyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and  an edgeedge with one Na(3)O8 hexagonal bipyramid. In the eleventh Na site, Na(11) is bonded to one O(14), one O(15), one O(20), and one O(4) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(4)O8 hexagonal bipyramid,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and  an edgeedge with one Na(4)O8 hexagonal bipyramid. Ti(1) is bonded to one O(17), one O(18), one O(23), one O(24), one O(25), and one O(26) atom to form TiO6 octahedra that share  a cornercorner with one Na(3)O8 hexagonal bipyramid,  a cornercorner with one Na(4)O8 hexagonal bipyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, and edges with two equivalent Na(7)O6 octahedra. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(1), one O(10), one O(11), one O(21), one O(6), and one O(7) atom to form distorted NbO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra, and edges with two equivalent Na(4)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 53-61°. In the second Nb site, Nb(2) is bonded to one O(12), one O(2), one O(22), one O(5), one O(8), and one O(9) atom to form distorted NbO6 octahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, and edges with two equivalent Na(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 53-61°. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(12), one O(19), one O(25), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one Ti(1)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra,  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and edges with two equivalent Na(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 28-68°. In the second Si site, Si(2) is bonded to one O(10), one O(11), one O(20), and one O(26) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one Ti(1)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra,  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and edges with two equivalent Na(4)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 28-67°. In the third Si site, Si(3) is bonded to one O(19), one O(23), one O(5), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one Ti(1)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra,  a cornercorner with one Na(10)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, and edges with two equivalent Na(3)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 37-61°. In the fourth Si site, Si(4) is bonded to one O(20), one O(24), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(2)O6 octahedra,  a cornercorner with one Na(7)O6 octahedra,  a cornercorner with one Ti(1)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra,  a cornercorner with one Na(11)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and edges with two equivalent Na(4)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 37-62°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(13), one O(15), and one O(4) atom to form PO4 tetrahedra that share  a cornercorner with one Na(4)O8 hexagonal bipyramid,  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Na(10)O4 tetrahedra, and corners with two equivalent Na(11)O4 tetrahedra. The corner-sharing octahedral tilt angles are 46°. In the second P site, P(2) is bonded to one O(14), one O(16), one O(2), and one O(3) atom to form PO4 tetrahedra that share  a cornercorner with one Na(3)O8 hexagonal bipyramid,  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Na(11)O4 tetrahedra, and corners with two equivalent Na(10)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. There are twenty-six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(6), one Na(8), one Nb(1), and one P(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(5), one Na(9), one Nb(2), and one P(2) atom. In the third O site, O(3) is bonded in a distorted tetrahedral geometry to one Na(10), one Na(5), one Na(8), and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted tetrahedral geometry to one Na(11), one Na(6), one Na(9), and one P(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Na(3), one Na(5), one Nb(2), and one Si(3) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Na(4), one Na(6), one Nb(1), and one Si(4) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Na(4), one Na(6), one Na(8), one Nb(1), and one Si(4) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Na(3), one Na(5), one Na(9), one Nb(2), and one Si(3) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Na(3), one Nb(2), and one Si(1) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Na(4), one Nb(1), and one Si(2) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Na(4), one Na(6), one Nb(1), and one Si(2) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Na(3), one Na(5), one Nb(2), and one Si(1) atom. In the thirteenth O site, O(13) is bonded in a distorted rectangular see-saw-like geometry to one Na(10), one Na(5), one Na(9), and one P(1) atom. In the fourteenth O site, O(14) is bonded in a distorted rectangular see-saw-like geometry to one Na(11), one Na(6), one Na(8), and one P(2) atom. In the fifteenth O site, O(15) is bonded in a distorted rectangular see-saw-like geometry to one Na(11), one Na(4), one Na(8), and one P(1) atom. In the sixteenth O site, O(16) is bonded in a distorted rectangular see-saw-like geometry to one Na(10), one Na(3), one Na(9), and one P(2) atom. In the seventeenth O site, O(17) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Na(4), and one Ti(1) atom. In the eighteenth O site, O(18) is bonded to one Na(1), one Na(2), one Na(3), and one Ti(1) atom to form distorted corner-sharing ONa3Ti tetrahedra. In the nineteenth O site, O(19) is bonded in a 5-coordinate geometry to one Na(10), two equivalent Na(3), one Si(1), and one Si(3) atom. In the twentieth O site, O(20) is bonded in a 5-coordinate geometry to one Na(11), two equivalent Na(4), one Si(2), and one Si(4) atom. In the twenty-first O site, O(21) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Na(7), and one Nb(1) atom. In the twenty-second O site, O(22) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Na(7), and one Nb(2) atom. In the twenty-third O site, O(23) is bonded in a 4-coordinate geometry to one Na(1), one Na(7), one Ti(1), and one Si(3) atom. In the twenty-fourth O site, O(24) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Na(7), one Ti(1), and one Si(4) atom. In the twenty-fifth O site, O(25) is bonded to one Na(2), one Na(7), one Ti(1), and one Si(1) atom to form distorted corner-sharing ONa2TiSi tetrahedra. In the twenty-sixth O site, O(26) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(7), one Ti(1), and one Si(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na11TiNb2Si4(PO13)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.575
_cell_length_b   7.247
_cell_length_c   14.714
_cell_angle_alpha   92.588
_cell_angle_beta   95.400
_cell_angle_gamma   90.551
_symmetry_Int_Tables_number   1
_cell_volume   591.129
_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  0.506  0.761  0.497  1.0
  Na  Na1  1  0.496  0.242  0.500  1.0
  Na  Na2  1  0.295  0.009  0.265  1.0
  Na  Na3  1  0.705  0.991  0.736  1.0
  Na  Na4  1  0.805  0.493  0.134  1.0
  Na  Na5  1  0.195  0.507  0.866  1.0
  Na  Na6  1  1.000  0.500  0.500  1.0
  Na  Na7  1  0.753  0.264  0.922  1.0
  Na  Na8  1  0.247  0.736  0.078  1.0
  Na  Na9  1  0.818  0.018  0.100  1.0
  Na  Na10  1  0.182  0.982  0.900  1.0
  Ti  Ti11  1  0.026  0.001  0.492  1.0
  Nb  Nb12  1  0.698  0.507  0.716  1.0
  Nb  Nb13  1  0.302  0.492  0.284  1.0
  Si  Si14  1  0.802  0.205  0.316  1.0
  Si  Si15  1  0.196  0.796  0.685  1.0
  Si  Si16  1  0.817  0.781  0.304  1.0
  Si  Si17  1  0.183  0.218  0.695  1.0
  P  P18  1  0.687  0.744  0.934  1.0
  P  P19  1  0.313  0.256  0.067  1.0
  O  O20  1  0.744  0.570  0.870  1.0
  O  O21  1  0.255  0.430  0.130  1.0
  O  O22  1  0.588  0.257  0.057  1.0
  O  O23  1  0.412  0.743  0.943  1.0
  O  O24  1  0.567  0.677  0.258  1.0
  O  O25  1  0.433  0.323  0.742  1.0
  O  O26  1  0.950  0.304  0.744  1.0
  O  O27  1  0.050  0.697  0.255  1.0
  O  O28  1  0.542  0.290  0.281  1.0
  O  O29  1  0.458  0.711  0.718  1.0
  O  O30  1  0.982  0.685  0.728  1.0
  O  O31  1  0.017  0.314  0.273  1.0
  O  O32  1  0.829  0.726  0.029  1.0
  O  O33  1  0.170  0.274  0.971  1.0
  O  O34  1  0.764  0.927  0.892  1.0
  O  O35  1  0.236  0.073  0.108  1.0
  O  O36  1  0.741  0.991  0.579  1.0
  O  O37  1  0.266  0.003  0.424  1.0
  O  O38  1  0.796  0.994  0.265  1.0
  O  O39  1  0.204  0.006  0.735  1.0
  O  O40  1  0.678  0.484  0.593  1.0
  O  O41  1  0.322  0.515  0.407  1.0
  O  O42  1  0.842  0.790  0.414  1.0
  O  O43  1  0.164  0.211  0.585  1.0
  O  O44  1  0.837  0.199  0.426  1.0
  O  O45  1  0.153  0.802  0.574  1.0
[/CIF]
.