The crystal 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 5-coordinate geometry to one O(8), two equivalent O(10), and two equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one N(1), two equivalent N(2), one O(4), two equivalent O(1), two equivalent O(11), and two equivalent O(9) atoms. Mg(1) is bonded to one N(2), one O(4), one O(6), and two equivalent O(3) atoms to form MgNO4 trigonal bipyramids that share  a cornercorner with one Ti(5)O6 octahedra, corners with two equivalent Mg(1)NO4 trigonal bipyramids,  an edgeedge with one Ti(4)N3O3 octahedra, edges with two equivalent Ti(1)NO5 octahedra, and edges with two equivalent Ti(3)O6 octahedra. The corner-sharing octahedral tilt angles are 8°. There are six inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one N(1), one O(1), one O(11), one O(3), and two equivalent O(4) atoms to form TiNO5 octahedra that share  a cornercorner with one Ti(3)O6 octahedra, corners with two equivalent Ti(1)NO5 octahedra,  an edgeedge with one Ti(2)NO5 octahedra, edges with two equivalent Ti(4)N3O3 octahedra, and edges with two equivalent Mg(1)NO4 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 2-5°. In the second Ti site, Ti(2) is bonded to one N(1), one O(1), one O(2), one O(7), and two equivalent O(5) atoms to form TiNO5 octahedra that share corners with two equivalent Ti(2)NO5 octahedra,  an edgeedge with one Ti(1)NO5 octahedra,  an edgeedge with one Ti(3)O6 octahedra, edges with two equivalent Ti(4)N3O3 octahedra, and edges with two equivalent Ti(5)O6 octahedra. The corner-sharing octahedral tilt angles are 23°. 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  a cornercorner with one Ti(1)NO5 octahedra, corners with two equivalent Ti(3)O6 octahedra,  an edgeedge with one Ti(2)NO5 octahedra, edges with two equivalent Ti(5)O6 octahedra, and edges with two equivalent Mg(1)NO4 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 2-18°. 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 distorted TiN3O3 octahedra that share corners with two equivalent Ti(4)N3O3 octahedra,  an edgeedge with one Ti(5)O6 octahedra, edges with two equivalent Ti(1)NO5 octahedra, edges with two equivalent Ti(2)NO5 octahedra, and  an edgeedge with one Mg(1)NO4 trigonal bipyramid. The corner-sharing octahedral tilt angles are 29°. In the fifth Ti site, Ti(5) is bonded to one O(10), one O(5), one O(6), one O(9), and two equivalent O(7) atoms to form distorted TiO6 octahedra that share corners with two equivalent Ti(5)O6 octahedra,  a cornercorner with one Mg(1)NO4 trigonal bipyramid,  an edgeedge with one Ti(4)N3O3 octahedra, edges with two equivalent Ti(2)NO5 octahedra, and edges with two equivalent Ti(3)O6 octahedra. The corner-sharing octahedral tilt angles are 24°. In the sixth Ti site, Ti(6) is bonded in a 6-coordinate geometry to one N(2), one O(10), one O(11), one O(6), and two equivalent O(8) atoms. There are two inequivalent N sites. In the first N site, N(1) is bonded to one Sr(2), one Ti(1), one Ti(2), and two equivalent Ti(4) atoms to form distorted NSrTi4 trigonal pyramids that share  a cornercorner with one O(2)Sr2Ti2 tetrahedra, corners with two equivalent N(1)SrTi4 trigonal pyramids, corners with two equivalent O(1)Sr2Ti2 trigonal pyramids,  an edgeedge with one O(1)Sr2Ti2 trigonal pyramid, and edges with two equivalent O(5)Ti4 trigonal pyramids. In the second N site, N(2) is bonded in a distorted T-shaped geometry to two equivalent Sr(2), one Mg(1), one Ti(4), and one Ti(6) atom. There are eleven inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(2), one Ti(1), and one Ti(2) atom to form distorted OSr2Ti2 trigonal pyramids that share  a cornercorner with one O(2)Sr2Ti2 tetrahedra, corners with two equivalent N(1)SrTi4 trigonal pyramids, corners with two equivalent O(1)Sr2Ti2 trigonal pyramids, corners with two equivalent O(5)Ti4 trigonal pyramids, and  an edgeedge with one N(1)SrTi4 trigonal pyramid. In the second O site, O(2) is bonded to two equivalent Sr(1), one Ti(2), and one Ti(3) atom to form distorted OSr2Ti2 tetrahedra that share corners with two equivalent O(2)Sr2Ti2 tetrahedra, corners with two equivalent O(6)MgTi4 trigonal bipyramids,  a cornercorner with one N(1)SrTi4 trigonal pyramid,  a cornercorner with one O(1)Sr2Ti2 trigonal pyramid, corners with two equivalent O(10)Sr2Ti2 trigonal pyramids, corners with two equivalent O(5)Ti4 trigonal pyramids, and  an edgeedge with one O(10)Sr2Ti2 trigonal pyramid. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(1), one Ti(1), and one Ti(3) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(2), 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 OTi4 trigonal pyramids that share corners with two equivalent O(2)Sr2Ti2 tetrahedra,  a cornercorner with one O(6)MgTi4 trigonal bipyramid,  a cornercorner with one O(10)Sr2Ti2 trigonal pyramid, corners with two equivalent O(1)Sr2Ti2 trigonal pyramids, corners with two equivalent O(5)Ti4 trigonal pyramids, and edges with two equivalent N(1)SrTi4 trigonal pyramids. In the sixth O site, O(6) is bonded to one Mg(1), one Ti(5), one Ti(6), and two equivalent Ti(3) atoms to form distorted OMgTi4 trigonal bipyramids that share corners with two equivalent O(2)Sr2Ti2 tetrahedra, corners with two equivalent O(6)MgTi4 trigonal bipyramids,  a cornercorner with one O(5)Ti4 trigonal pyramid, and  an edgeedge with one O(10)Sr2Ti2 trigonal pyramid. In the seventh O site, O(7) is bonded in a rectangular see-saw-like 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 4-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 rectangular see-saw-like geometry to two equivalent Sr(2), one Ti(4), and one Ti(5) atom. In the tenth O site, O(10) is bonded to two equivalent Sr(1), one Ti(5), and one Ti(6) atom to form distorted OSr2Ti2 trigonal pyramids that share corners with two equivalent O(2)Sr2Ti2 tetrahedra,  a cornercorner with one O(5)Ti4 trigonal pyramid, corners with two equivalent O(10)Sr2Ti2 trigonal pyramids,  an edgeedge with one O(2)Sr2Ti2 tetrahedra, and  an edgeedge with one O(6)MgTi4 trigonal bipyramid. In the eleventh O site, O(11) is bonded in a distorted linear geometry to two equivalent Sr(2), one Ti(1), and one Ti(6) atom. is represented by the CIF card [CIF]
data_Sr2MgTi6N2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.918
_cell_length_b   7.822
_cell_length_c   9.416
_cell_angle_alpha   84.551
_cell_angle_beta   89.998
_cell_angle_gamma   75.484
_symmetry_Int_Tables_number   1
_cell_volume   277.986
_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  0.527  0.943  0.733  1.0
  Sr  Sr1  1  0.442  0.113  0.230  1.0
  Mg  Mg2  1  0.711  0.574  0.963  1.0
  Ti  Ti3  1  0.120  0.756  0.117  1.0
  Ti  Ti4  1  0.165  0.667  0.426  1.0
  Ti  Ti5  1  0.240  0.516  0.744  1.0
  Ti  Ti6  1  0.764  0.468  0.255  1.0
  Ti  Ti7  1  0.825  0.346  0.572  1.0
  Ti  Ti8  1  0.889  0.219  0.917  1.0
  N  N9  1  0.231  0.536  0.250  1.0
  N  N10  1  0.832  0.333  0.086  1.0
  O  O11  1  0.059  0.877  0.301  1.0
  O  O12  1  0.129  0.738  0.633  1.0
  O  O13  1  0.178  0.640  0.928  1.0
  O  O14  1  0.625  0.746  0.113  1.0
  O  O15  1  0.690  0.617  0.444  1.0
  O  O16  1  0.757  0.483  0.767  1.0
  O  O17  1  0.299  0.399  0.556  1.0
  O  O18  1  0.372  0.253  0.865  1.0
  O  O19  1  0.868  0.260  0.381  1.0
  O  O20  1  0.931  0.136  0.682  1.0
  O  O21  1  0.003  0.990  0.991  1.0
[/CIF]
.
The crystal 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 5-coordinate geometry to one O(8), two equivalent O(10), and two equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one N(1), two equivalent N(2), one O(4), two equivalent O(1), two equivalent O(11), and two equivalent O(9) atoms. Mg(1) is bonded to one N(2), one O(4), one O(6), and two equivalent O(3) atoms to form MgNO4 trigonal bipyramids that share  a cornercorner with one Ti(5)O6 octahedra, corners with two equivalent Mg(1)NO4 trigonal bipyramids,  an edgeedge with one Ti(4)N3O3 octahedra, edges with two equivalent Ti(1)NO5 octahedra, and edges with two equivalent Ti(3)O6 octahedra. The corner-sharing octahedral tilt angles are 8°. There are six inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one N(1), one O(1), one O(11), one O(3), and two equivalent O(4) atoms to form TiNO5 octahedra that share  a cornercorner with one Ti(3)O6 octahedra, corners with two equivalent Ti(1)NO5 octahedra,  an edgeedge with one Ti(2)NO5 octahedra, edges with two equivalent Ti(4)N3O3 octahedra, and edges with two equivalent Mg(1)NO4 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 2-5°. In the second Ti site, Ti(2) is bonded to one N(1), one O(1), one O(2), one O(7), and two equivalent O(5) atoms to form TiNO5 octahedra that share corners with two equivalent Ti(2)NO5 octahedra,  an edgeedge with one Ti(1)NO5 octahedra,  an edgeedge with one Ti(3)O6 octahedra, edges with two equivalent Ti(4)N3O3 octahedra, and edges with two equivalent Ti(5)O6 octahedra. The corner-sharing octahedral tilt angles are 23°. 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  a cornercorner with one Ti(1)NO5 octahedra, corners with two equivalent Ti(3)O6 octahedra,  an edgeedge with one Ti(2)NO5 octahedra, edges with two equivalent Ti(5)O6 octahedra, and edges with two equivalent Mg(1)NO4 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 2-18°. 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 distorted TiN3O3 octahedra that share corners with two equivalent Ti(4)N3O3 octahedra,  an edgeedge with one Ti(5)O6 octahedra, edges with two equivalent Ti(1)NO5 octahedra, edges with two equivalent Ti(2)NO5 octahedra, and  an edgeedge with one Mg(1)NO4 trigonal bipyramid. The corner-sharing octahedral tilt angles are 29°. In the fifth Ti site, Ti(5) is bonded to one O(10), one O(5), one O(6), one O(9), and two equivalent O(7) atoms to form distorted TiO6 octahedra that share corners with two equivalent Ti(5)O6 octahedra,  a cornercorner with one Mg(1)NO4 trigonal bipyramid,  an edgeedge with one Ti(4)N3O3 octahedra, edges with two equivalent Ti(2)NO5 octahedra, and edges with two equivalent Ti(3)O6 octahedra. The corner-sharing octahedral tilt angles are 24°. In the sixth Ti site, Ti(6) is bonded in a 6-coordinate geometry to one N(2), one O(10), one O(11), one O(6), and two equivalent O(8) atoms. There are two inequivalent N sites. In the first N site, N(1) is bonded to one Sr(2), one Ti(1), one Ti(2), and two equivalent Ti(4) atoms to form distorted NSrTi4 trigonal pyramids that share  a cornercorner with one O(2)Sr2Ti2 tetrahedra, corners with two equivalent N(1)SrTi4 trigonal pyramids, corners with two equivalent O(1)Sr2Ti2 trigonal pyramids,  an edgeedge with one O(1)Sr2Ti2 trigonal pyramid, and edges with two equivalent O(5)Ti4 trigonal pyramids. In the second N site, N(2) is bonded in a distorted T-shaped geometry to two equivalent Sr(2), one Mg(1), one Ti(4), and one Ti(6) atom. There are eleven inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(2), one Ti(1), and one Ti(2) atom to form distorted OSr2Ti2 trigonal pyramids that share  a cornercorner with one O(2)Sr2Ti2 tetrahedra, corners with two equivalent N(1)SrTi4 trigonal pyramids, corners with two equivalent O(1)Sr2Ti2 trigonal pyramids, corners with two equivalent O(5)Ti4 trigonal pyramids, and  an edgeedge with one N(1)SrTi4 trigonal pyramid. In the second O site, O(2) is bonded to two equivalent Sr(1), one Ti(2), and one Ti(3) atom to form distorted OSr2Ti2 tetrahedra that share corners with two equivalent O(2)Sr2Ti2 tetrahedra, corners with two equivalent O(6)MgTi4 trigonal bipyramids,  a cornercorner with one N(1)SrTi4 trigonal pyramid,  a cornercorner with one O(1)Sr2Ti2 trigonal pyramid, corners with two equivalent O(10)Sr2Ti2 trigonal pyramids, corners with two equivalent O(5)Ti4 trigonal pyramids, and  an edgeedge with one O(10)Sr2Ti2 trigonal pyramid. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(1), one Ti(1), and one Ti(3) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(2), 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 OTi4 trigonal pyramids that share corners with two equivalent O(2)Sr2Ti2 tetrahedra,  a cornercorner with one O(6)MgTi4 trigonal bipyramid,  a cornercorner with one O(10)Sr2Ti2 trigonal pyramid, corners with two equivalent O(1)Sr2Ti2 trigonal pyramids, corners with two equivalent O(5)Ti4 trigonal pyramids, and edges with two equivalent N(1)SrTi4 trigonal pyramids. In the sixth O site, O(6) is bonded to one Mg(1), one Ti(5), one Ti(6), and two equivalent Ti(3) atoms to form distorted OMgTi4 trigonal bipyramids that share corners with two equivalent O(2)Sr2Ti2 tetrahedra, corners with two equivalent O(6)MgTi4 trigonal bipyramids,  a cornercorner with one O(5)Ti4 trigonal pyramid, and  an edgeedge with one O(10)Sr2Ti2 trigonal pyramid. In the seventh O site, O(7) is bonded in a rectangular see-saw-like 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 4-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 rectangular see-saw-like geometry to two equivalent Sr(2), one Ti(4), and one Ti(5) atom. In the tenth O site, O(10) is bonded to two equivalent Sr(1), one Ti(5), and one Ti(6) atom to form distorted OSr2Ti2 trigonal pyramids that share corners with two equivalent O(2)Sr2Ti2 tetrahedra,  a cornercorner with one O(5)Ti4 trigonal pyramid, corners with two equivalent O(10)Sr2Ti2 trigonal pyramids,  an edgeedge with one O(2)Sr2Ti2 tetrahedra, and  an edgeedge with one O(6)MgTi4 trigonal bipyramid. In the eleventh O site, O(11) is bonded in a distorted linear geometry to two equivalent Sr(2), one Ti(1), and one Ti(6) atom. is represented by the CIF card [CIF]
data_Sr2MgTi6N2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.918
_cell_length_b   7.822
_cell_length_c   9.416
_cell_angle_alpha   84.551
_cell_angle_beta   89.998
_cell_angle_gamma   75.484
_symmetry_Int_Tables_number   1
_cell_volume   277.986
_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  0.527  0.943  0.733  1.0
  Sr  Sr1  1  0.442  0.113  0.230  1.0
  Mg  Mg2  1  0.711  0.574  0.963  1.0
  Ti  Ti3  1  0.120  0.756  0.117  1.0
  Ti  Ti4  1  0.165  0.667  0.426  1.0
  Ti  Ti5  1  0.240  0.516  0.744  1.0
  Ti  Ti6  1  0.764  0.468  0.255  1.0
  Ti  Ti7  1  0.825  0.346  0.572  1.0
  Ti  Ti8  1  0.889  0.219  0.917  1.0
  N  N9  1  0.231  0.536  0.250  1.0
  N  N10  1  0.832  0.333  0.086  1.0
  O  O11  1  0.059  0.877  0.301  1.0
  O  O12  1  0.129  0.738  0.633  1.0
  O  O13  1  0.178  0.640  0.928  1.0
  O  O14  1  0.625  0.746  0.113  1.0
  O  O15  1  0.690  0.617  0.444  1.0
  O  O16  1  0.757  0.483  0.767  1.0
  O  O17  1  0.299  0.399  0.556  1.0
  O  O18  1  0.372  0.253  0.865  1.0
  O  O19  1  0.868  0.260  0.381  1.0
  O  O20  1  0.931  0.136  0.682  1.0
  O  O21  1  0.003  0.990  0.991  1.0
[/CIF]
.