The crystal structure described by Sr2Ti6N2O11 crystallizes in the monoclinic Cm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 11-coordinate geometry to one N(1), two equivalent N(2), one O(5), one O(8), two equivalent O(11), two equivalent O(2), and two equivalent O(3) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(10), and two equivalent O(9) atoms. There are six inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one N(2), two equivalent N(1), one O(1), one O(3), and one O(6) atom to form distorted TiN3O3 octahedra that share  a cornercorner with one Ti(6)NO5 octahedra,  a cornercorner with one Ti(3)O6 octahedra, corners with two equivalent Ti(1)N3O3 octahedra,  an edgeedge with one Ti(2)O6 octahedra, and edges with two equivalent Ti(4)NO5 octahedra. The corner-sharing octahedral tilt angles range from 1-26°. In the second Ti site, Ti(2) is bonded to one O(1), one O(2), one O(6), one O(7), and two equivalent O(4) atoms to form distorted TiO6 octahedra that share corners with two equivalent Ti(2)O6 octahedra,  an edgeedge with one Ti(1)N3O3 octahedra,  an edgeedge with one Ti(3)O6 octahedra, and edges with two equivalent Ti(4)NO5 octahedra. The corner-sharing octahedral tilt angles are 32°. In the third Ti site, Ti(3) is bonded to one O(2), one O(3), one O(7), one O(8), and two equivalent O(5) atoms to form distorted TiO6 octahedra that share  a cornercorner with one Ti(1)N3O3 octahedra, corners with two equivalent Ti(3)O6 octahedra,  an edgeedge with one Ti(2)O6 octahedra, and edges with two equivalent Ti(6)NO5 octahedra. The corner-sharing octahedral tilt angles range from 18-21°. In the fourth Ti site, Ti(4) is bonded to one N(1), one O(10), one O(4), one O(9), and two equivalent O(6) atoms to form distorted TiNO5 octahedra that share  a cornercorner with one Ti(6)NO5 octahedra, corners with two equivalent Ti(4)NO5 octahedra, edges with two equivalent Ti(1)N3O3 octahedra, and edges with two equivalent Ti(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 20-21°. In the fifth Ti site, Ti(5) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(4), one O(5), and two equivalent O(7) atoms. In the sixth Ti site, Ti(6) is bonded to one N(2), one O(11), one O(5), one O(9), and two equivalent O(8) atoms to form distorted TiNO5 octahedra that share  a cornercorner with one Ti(1)N3O3 octahedra,  a cornercorner with one Ti(4)NO5 octahedra, corners with two equivalent Ti(6)NO5 octahedra, and edges with two equivalent Ti(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 1-27°. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted T-shaped geometry to one Sr(1), one Ti(4), and two equivalent Ti(1) atoms. In the second N site, N(2) is bonded in a linear geometry to two equivalent Sr(1), one Ti(1), and one Ti(6) atom. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(2), one Ti(1), and one Ti(2) atom. In the second O site, O(2) is bonded in a distorted water-like geometry to two equivalent Sr(1), one Ti(2), and one Ti(3) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(1), one Ti(1), and one Ti(3) atom. In the fourth O site, O(4) is bonded to one Ti(4), one Ti(5), and two equivalent Ti(2) atoms to form a mixture of distorted edge and corner-sharing OTi4 trigonal pyramids. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Sr(1), one Ti(5), one Ti(6), and two equivalent Ti(3) atoms. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ti(1), one Ti(2), and two equivalent Ti(4) atoms. In the seventh O site, O(7) is bonded to one Ti(2), one Ti(3), and two equivalent Ti(5) atoms to form a mixture of distorted edge and corner-sharing OTi4 trigonal pyramids. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Sr(1), one Ti(3), and two equivalent Ti(6) atoms. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to two equivalent Sr(2), one Ti(4), and one Ti(6) atom. In the tenth O site, O(10) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(2), one Ti(4), and one Ti(5) atom. In the eleventh O site, O(11) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(1), one Ti(5), and one Ti(6) atom. is represented by the CIF file [CIF]
data_Sr2Ti6N2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.852
_cell_length_b   7.852
_cell_length_c   9.311
_cell_angle_alpha   82.482
_cell_angle_beta   82.482
_cell_angle_gamma   28.263
_symmetry_Int_Tables_number   1
_cell_volume   269.352
_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
  Sr  Sr0  1  0.547  0.547  0.220  1.0
  Sr  Sr1  1  0.450  0.450  0.769  1.0
  Ti  Ti2  1  0.115  0.115  0.909  1.0
  Ti  Ti3  1  0.168  0.168  0.563  1.0
  Ti  Ti4  1  0.236  0.236  0.235  1.0
  Ti  Ti5  1  0.755  0.755  0.777  1.0
  Ti  Ti6  1  0.838  0.838  0.443  1.0
  Ti  Ti7  1  0.884  0.884  0.089  1.0
  N  N8  1  0.644  0.644  0.890  1.0
  N  N9  1  0.999  0.999  0.001  1.0
  O  O10  1  0.070  0.070  0.701  1.0
  O  O11  1  0.127  0.127  0.386  1.0
  O  O12  1  0.161  0.161  0.101  1.0
  O  O13  1  0.703  0.703  0.572  1.0
  O  O14  1  0.757  0.757  0.248  1.0
  O  O15  1  0.247  0.247  0.745  1.0
  O  O16  1  0.300  0.300  0.431  1.0
  O  O17  1  0.358  0.358  0.121  1.0
  O  O18  1  0.838  0.838  0.906  1.0
  O  O19  1  0.883  0.883  0.611  1.0
  O  O20  1  0.932  0.932  0.296  1.0
[/CIF]
.
The crystal structure described by Sr2Ti6N2O11 crystallizes in the monoclinic Cm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 11-coordinate geometry to one N(1), two equivalent N(2), one O(5), one O(8), two equivalent O(11), two equivalent O(2), and two equivalent O(3) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(10), and two equivalent O(9) atoms. There are six inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one N(2), two equivalent N(1), one O(1), one O(3), and one O(6) atom to form distorted TiN3O3 octahedra that share  a cornercorner with one Ti(6)NO5 octahedra,  a cornercorner with one Ti(3)O6 octahedra, corners with two equivalent Ti(1)N3O3 octahedra,  an edgeedge with one Ti(2)O6 octahedra, and edges with two equivalent Ti(4)NO5 octahedra. The corner-sharing octahedral tilt angles range from 1-26°. In the second Ti site, Ti(2) is bonded to one O(1), one O(2), one O(6), one O(7), and two equivalent O(4) atoms to form distorted TiO6 octahedra that share corners with two equivalent Ti(2)O6 octahedra,  an edgeedge with one Ti(1)N3O3 octahedra,  an edgeedge with one Ti(3)O6 octahedra, and edges with two equivalent Ti(4)NO5 octahedra. The corner-sharing octahedral tilt angles are 32°. In the third Ti site, Ti(3) is bonded to one O(2), one O(3), one O(7), one O(8), and two equivalent O(5) atoms to form distorted TiO6 octahedra that share  a cornercorner with one Ti(1)N3O3 octahedra, corners with two equivalent Ti(3)O6 octahedra,  an edgeedge with one Ti(2)O6 octahedra, and edges with two equivalent Ti(6)NO5 octahedra. The corner-sharing octahedral tilt angles range from 18-21°. In the fourth Ti site, Ti(4) is bonded to one N(1), one O(10), one O(4), one O(9), and two equivalent O(6) atoms to form distorted TiNO5 octahedra that share  a cornercorner with one Ti(6)NO5 octahedra, corners with two equivalent Ti(4)NO5 octahedra, edges with two equivalent Ti(1)N3O3 octahedra, and edges with two equivalent Ti(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 20-21°. In the fifth Ti site, Ti(5) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(4), one O(5), and two equivalent O(7) atoms. In the sixth Ti site, Ti(6) is bonded to one N(2), one O(11), one O(5), one O(9), and two equivalent O(8) atoms to form distorted TiNO5 octahedra that share  a cornercorner with one Ti(1)N3O3 octahedra,  a cornercorner with one Ti(4)NO5 octahedra, corners with two equivalent Ti(6)NO5 octahedra, and edges with two equivalent Ti(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 1-27°. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted T-shaped geometry to one Sr(1), one Ti(4), and two equivalent Ti(1) atoms. In the second N site, N(2) is bonded in a linear geometry to two equivalent Sr(1), one Ti(1), and one Ti(6) atom. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(2), one Ti(1), and one Ti(2) atom. In the second O site, O(2) is bonded in a distorted water-like geometry to two equivalent Sr(1), one Ti(2), and one Ti(3) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(1), one Ti(1), and one Ti(3) atom. In the fourth O site, O(4) is bonded to one Ti(4), one Ti(5), and two equivalent Ti(2) atoms to form a mixture of distorted edge and corner-sharing OTi4 trigonal pyramids. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Sr(1), one Ti(5), one Ti(6), and two equivalent Ti(3) atoms. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ti(1), one Ti(2), and two equivalent Ti(4) atoms. In the seventh O site, O(7) is bonded to one Ti(2), one Ti(3), and two equivalent Ti(5) atoms to form a mixture of distorted edge and corner-sharing OTi4 trigonal pyramids. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Sr(1), one Ti(3), and two equivalent Ti(6) atoms. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to two equivalent Sr(2), one Ti(4), and one Ti(6) atom. In the tenth O site, O(10) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(2), one Ti(4), and one Ti(5) atom. In the eleventh O site, O(11) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(1), one Ti(5), and one Ti(6) atom. is represented by the CIF file [CIF]
data_Sr2Ti6N2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.852
_cell_length_b   7.852
_cell_length_c   9.311
_cell_angle_alpha   82.482
_cell_angle_beta   82.482
_cell_angle_gamma   28.263
_symmetry_Int_Tables_number   1
_cell_volume   269.352
_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
  Sr  Sr0  1  0.547  0.547  0.220  1.0
  Sr  Sr1  1  0.450  0.450  0.769  1.0
  Ti  Ti2  1  0.115  0.115  0.909  1.0
  Ti  Ti3  1  0.168  0.168  0.563  1.0
  Ti  Ti4  1  0.236  0.236  0.235  1.0
  Ti  Ti5  1  0.755  0.755  0.777  1.0
  Ti  Ti6  1  0.838  0.838  0.443  1.0
  Ti  Ti7  1  0.884  0.884  0.089  1.0
  N  N8  1  0.644  0.644  0.890  1.0
  N  N9  1  0.999  0.999  0.001  1.0
  O  O10  1  0.070  0.070  0.701  1.0
  O  O11  1  0.127  0.127  0.386  1.0
  O  O12  1  0.161  0.161  0.101  1.0
  O  O13  1  0.703  0.703  0.572  1.0
  O  O14  1  0.757  0.757  0.248  1.0
  O  O15  1  0.247  0.247  0.745  1.0
  O  O16  1  0.300  0.300  0.431  1.0
  O  O17  1  0.358  0.358  0.121  1.0
  O  O18  1  0.838  0.838  0.906  1.0
  O  O19  1  0.883  0.883  0.611  1.0
  O  O20  1  0.932  0.932  0.296  1.0
[/CIF]
.