The structure described by Sr2MgTi6N2O11 crystallizes in the monoclinic Cm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(6), two equivalent O(10), 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 N(2), two equivalent O(1), and two equivalent O(9) atoms. Mg(1) is bonded in a rectangular see-saw-like geometry to one O(4), one O(8), and two equivalent O(11) atoms. There are six inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one N(1), one O(11), one O(3), and two equivalent O(4) atoms to form TiNO4 trigonal bipyramids that share  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(6)NO4 trigonal bipyramid, corners with two equivalent Ti(1)NO4 trigonal bipyramids, and edges with two equivalent Ti(4)N3O3 octahedra. The corner-sharing octahedral tilt angles are 22°. In the second Ti site, Ti(2) is bonded in a 6-coordinate geometry to one N(1), one O(1), one O(2), one O(7), and two equivalent O(5) atoms. 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(6) atoms to form TiO6 octahedra that share corners with two equivalent Ti(3)O6 octahedra,  a cornercorner with one Ti(1)NO4 trigonal bipyramid, and edges with two equivalent Ti(6)NO4 trigonal bipyramids. The corner-sharing octahedral tilt angles are 19°. In the fourth Ti site, Ti(4) is bonded to one N(2), two equivalent N(1), one O(4), one O(5), and one O(9) atom to form TiN3O3 octahedra that share corners with two equivalent Ti(4)N3O3 octahedra,  a cornercorner with one Ti(6)NO4 trigonal bipyramid, and edges with two equivalent Ti(1)NO4 trigonal bipyramids. The corner-sharing octahedral tilt angles are 24°. In the fifth Ti site, Ti(5) is bonded in a 6-coordinate geometry to one O(10), one O(5), one O(6), one O(9), and two equivalent O(7) atoms. In the sixth Ti site, Ti(6) is bonded to one N(2), one O(11), one O(6), and two equivalent O(8) atoms to form distorted TiNO4 trigonal bipyramids that share  a cornercorner with one Ti(4)N3O3 octahedra,  a cornercorner with one Ti(1)NO4 trigonal bipyramid, corners with two equivalent Ti(6)NO4 trigonal bipyramids, and edges with two equivalent Ti(3)O6 octahedra. The corner-sharing octahedral tilt angles are 26°. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted see-saw-like geometry to one Ti(1), one Ti(2), and two equivalent Ti(4) atoms. In the second N site, N(2) is bonded in a distorted bent 150 degrees geometry to two equivalent Sr(2), one Ti(4), and one Ti(6) atom. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Sr(2) and one Ti(2) atom. In the second O site, O(2) is bonded in a 4-coordinate 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 in a rectangular see-saw-like geometry to one Mg(1), one Ti(4), and two equivalent Ti(1) atoms. In the fifth O site, O(5) is bonded to one Ti(4), one Ti(5), and two equivalent Ti(2) atoms to form distorted OTi4 trigonal pyramids that share corners with two equivalent O(5)Ti4 trigonal pyramids and  an edgeedge with one O(9)Sr2Ti2 trigonal pyramid. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), one Ti(5), one Ti(6), and two equivalent Ti(3) atoms. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ti(2), one Ti(3), and two equivalent Ti(5) atoms. In the eighth O site, O(8) is bonded in a square co-planar geometry to one Mg(1), one Ti(3), and two equivalent Ti(6) atoms. In the ninth O site, O(9) is bonded to two equivalent Sr(2), one Ti(4), and one Ti(5) atom to form distorted OSr2Ti2 trigonal pyramids that share corners with two equivalent O(9)Sr2Ti2 trigonal pyramids and  an edgeedge with one O(5)Ti4 trigonal pyramid. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one Ti(5) atom. In the eleventh O site, O(11) is bonded in a square co-planar geometry to two equivalent Mg(1), one Ti(1), and one Ti(6) atom. is represented by the CIF file [CIF]
data_Sr2MgTi6N2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.917
_cell_length_b   7.898
_cell_length_c   9.908
_cell_angle_alpha   75.199
_cell_angle_beta   89.998
_cell_angle_gamma   75.639
_symmetry_Int_Tables_number   1
_cell_volume   286.486
_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  0.570  0.856  0.710  1.0
  Sr  Sr1  1  0.422  0.153  0.303  1.0
  Mg  Mg2  1  0.496  0.006  0.013  1.0
  Ti  Ti3  1  0.139  0.718  0.051  1.0
  Ti  Ti4  1  0.156  0.685  0.412  1.0
  Ti  Ti5  1  0.251  0.496  0.750  1.0
  Ti  Ti6  1  0.743  0.512  0.242  1.0
  Ti  Ti7  1  0.841  0.315  0.582  1.0
  Ti  Ti8  1  0.856  0.285  0.959  1.0
  N  N9  1  0.216  0.565  0.247  1.0
  N  N10  1  0.827  0.342  0.123  1.0
  O  O11  1  0.039  0.918  0.326  1.0
  O  O12  1  0.140  0.718  0.610  1.0
  O  O13  1  0.170  0.658  0.883  1.0
  O  O14  1  0.627  0.744  0.068  1.0
  O  O15  1  0.687  0.623  0.429  1.0
  O  O16  1  0.772  0.453  0.755  1.0
  O  O17  1  0.312  0.374  0.587  1.0
  O  O18  1  0.367  0.262  0.918  1.0
  O  O19  1  0.858  0.282  0.403  1.0
  O  O20  1  0.955  0.086  0.682  1.0
  O  O21  1  0.998  0.001  0.009  1.0
[/CIF]
.
The structure described by Sr2MgTi6N2O11 crystallizes in the monoclinic Cm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(6), two equivalent O(10), 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 N(2), two equivalent O(1), and two equivalent O(9) atoms. Mg(1) is bonded in a rectangular see-saw-like geometry to one O(4), one O(8), and two equivalent O(11) atoms. There are six inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one N(1), one O(11), one O(3), and two equivalent O(4) atoms to form TiNO4 trigonal bipyramids that share  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(6)NO4 trigonal bipyramid, corners with two equivalent Ti(1)NO4 trigonal bipyramids, and edges with two equivalent Ti(4)N3O3 octahedra. The corner-sharing octahedral tilt angles are 22°. In the second Ti site, Ti(2) is bonded in a 6-coordinate geometry to one N(1), one O(1), one O(2), one O(7), and two equivalent O(5) atoms. 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(6) atoms to form TiO6 octahedra that share corners with two equivalent Ti(3)O6 octahedra,  a cornercorner with one Ti(1)NO4 trigonal bipyramid, and edges with two equivalent Ti(6)NO4 trigonal bipyramids. The corner-sharing octahedral tilt angles are 19°. In the fourth Ti site, Ti(4) is bonded to one N(2), two equivalent N(1), one O(4), one O(5), and one O(9) atom to form TiN3O3 octahedra that share corners with two equivalent Ti(4)N3O3 octahedra,  a cornercorner with one Ti(6)NO4 trigonal bipyramid, and edges with two equivalent Ti(1)NO4 trigonal bipyramids. The corner-sharing octahedral tilt angles are 24°. In the fifth Ti site, Ti(5) is bonded in a 6-coordinate geometry to one O(10), one O(5), one O(6), one O(9), and two equivalent O(7) atoms. In the sixth Ti site, Ti(6) is bonded to one N(2), one O(11), one O(6), and two equivalent O(8) atoms to form distorted TiNO4 trigonal bipyramids that share  a cornercorner with one Ti(4)N3O3 octahedra,  a cornercorner with one Ti(1)NO4 trigonal bipyramid, corners with two equivalent Ti(6)NO4 trigonal bipyramids, and edges with two equivalent Ti(3)O6 octahedra. The corner-sharing octahedral tilt angles are 26°. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted see-saw-like geometry to one Ti(1), one Ti(2), and two equivalent Ti(4) atoms. In the second N site, N(2) is bonded in a distorted bent 150 degrees geometry to two equivalent Sr(2), one Ti(4), and one Ti(6) atom. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Sr(2) and one Ti(2) atom. In the second O site, O(2) is bonded in a 4-coordinate 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 in a rectangular see-saw-like geometry to one Mg(1), one Ti(4), and two equivalent Ti(1) atoms. In the fifth O site, O(5) is bonded to one Ti(4), one Ti(5), and two equivalent Ti(2) atoms to form distorted OTi4 trigonal pyramids that share corners with two equivalent O(5)Ti4 trigonal pyramids and  an edgeedge with one O(9)Sr2Ti2 trigonal pyramid. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), one Ti(5), one Ti(6), and two equivalent Ti(3) atoms. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ti(2), one Ti(3), and two equivalent Ti(5) atoms. In the eighth O site, O(8) is bonded in a square co-planar geometry to one Mg(1), one Ti(3), and two equivalent Ti(6) atoms. In the ninth O site, O(9) is bonded to two equivalent Sr(2), one Ti(4), and one Ti(5) atom to form distorted OSr2Ti2 trigonal pyramids that share corners with two equivalent O(9)Sr2Ti2 trigonal pyramids and  an edgeedge with one O(5)Ti4 trigonal pyramid. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one Ti(5) atom. In the eleventh O site, O(11) is bonded in a square co-planar geometry to two equivalent Mg(1), one Ti(1), and one Ti(6) atom. is represented by the CIF file [CIF]
data_Sr2MgTi6N2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.917
_cell_length_b   7.898
_cell_length_c   9.908
_cell_angle_alpha   75.199
_cell_angle_beta   89.998
_cell_angle_gamma   75.639
_symmetry_Int_Tables_number   1
_cell_volume   286.486
_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  0.570  0.856  0.710  1.0
  Sr  Sr1  1  0.422  0.153  0.303  1.0
  Mg  Mg2  1  0.496  0.006  0.013  1.0
  Ti  Ti3  1  0.139  0.718  0.051  1.0
  Ti  Ti4  1  0.156  0.685  0.412  1.0
  Ti  Ti5  1  0.251  0.496  0.750  1.0
  Ti  Ti6  1  0.743  0.512  0.242  1.0
  Ti  Ti7  1  0.841  0.315  0.582  1.0
  Ti  Ti8  1  0.856  0.285  0.959  1.0
  N  N9  1  0.216  0.565  0.247  1.0
  N  N10  1  0.827  0.342  0.123  1.0
  O  O11  1  0.039  0.918  0.326  1.0
  O  O12  1  0.140  0.718  0.610  1.0
  O  O13  1  0.170  0.658  0.883  1.0
  O  O14  1  0.627  0.744  0.068  1.0
  O  O15  1  0.687  0.623  0.429  1.0
  O  O16  1  0.772  0.453  0.755  1.0
  O  O17  1  0.312  0.374  0.587  1.0
  O  O18  1  0.367  0.262  0.918  1.0
  O  O19  1  0.858  0.282  0.403  1.0
  O  O20  1  0.955  0.086  0.682  1.0
  O  O21  1  0.998  0.001  0.009  1.0
[/CIF]
.