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 10-coordinate geometry to one O(4), one O(8), two equivalent O(10), 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 4-coordinate geometry to two equivalent O(1) and two equivalent O(9) atoms. Mg(1) is bonded to one N(1), two equivalent N(2), one O(3), and one O(8) atom to form MgN3O2 trigonal bipyramids that share  a cornercorner with one Ti(2)NO5 octahedra, corners with two equivalent Mg(1)N3O2 trigonal bipyramids,  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(6)NO5 octahedra. The corner-sharing octahedral tilt angles are 3°. 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(6)NO5 octahedra,  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  an edgeedge with one Mg(1)N3O2 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 2-22°. 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,  a cornercorner with one Mg(1)N3O2 trigonal bipyramid,  an edgeedge with one Ti(1)NO5 octahedra,  an edgeedge with one Ti(3)O6 octahedra, and edges with two equivalent Ti(4)N3O3 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 distorted 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(6)NO5 octahedra, and  an edgeedge with one Mg(1)N3O2 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 2-31°. 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  a cornercorner with one Ti(6)NO5 octahedra, corners with two equivalent Ti(4)N3O3 octahedra, edges with two equivalent Ti(1)NO5 octahedra, edges with two equivalent Ti(2)NO5 octahedra, and edges with two equivalent Mg(1)N3O2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 10-29°. 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(10), one O(11), one O(6), and two equivalent O(8) atoms to form distorted TiNO5 octahedra that share  a cornercorner with one Ti(4)N3O3 octahedra,  a cornercorner with one Ti(1)NO5 octahedra, corners with two equivalent Ti(6)NO5 octahedra, edges with two equivalent Ti(3)O6 octahedra, and edges with two equivalent Mg(1)N3O2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 10-27°. There are two inequivalent N sites. In the first N site, N(1) is bonded to one Mg(1), one Ti(1), one Ti(2), and two equivalent Ti(4) atoms to form NMgTi4 trigonal bipyramids that share corners with two equivalent O(9)Sr2Ti2 tetrahedra, corners with two equivalent N(1)MgTi4 trigonal bipyramids,  a cornercorner with one O(7)Ti4 trigonal pyramid,  an edgeedge with one O(1)Sr2Ti2 tetrahedra, and  an edgeedge with one O(3)Sr2MgTi2 trigonal bipyramid. In the second N site, N(2) is bonded in a distorted see-saw-like geometry to two equivalent 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 tetrahedra that share corners with two equivalent O(1)Sr2Ti2 tetrahedra, corners with two equivalent O(9)Sr2Ti2 tetrahedra,  a cornercorner with one O(3)Sr2MgTi2 trigonal bipyramid,  a cornercorner with one O(7)Ti4 trigonal pyramid,  an edgeedge with one O(9)Sr2Ti2 tetrahedra, and  an edgeedge with one N(1)MgTi4 trigonal bipyramid. 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 to two equivalent Sr(1), one Mg(1), one Ti(1), and one Ti(3) atom to form distorted OSr2MgTi2 trigonal bipyramids that share  a cornercorner with one O(1)Sr2Ti2 tetrahedra, corners with two equivalent O(3)Sr2MgTi2 trigonal bipyramids,  a cornercorner with one O(7)Ti4 trigonal pyramid, corners with two equivalent O(6)Ti4 trigonal pyramids, and  an edgeedge with one N(1)MgTi4 trigonal bipyramid. In the fourth O site, O(4) is bonded in a distorted linear geometry to one Sr(1), one Ti(4), and two equivalent Ti(1) atoms. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Ti(4), one Ti(5), and two equivalent Ti(2) atoms. In the sixth O site, O(6) is bonded to one Ti(5), one Ti(6), and two equivalent Ti(3) atoms to form distorted OTi4 trigonal pyramids that share  a cornercorner with one O(9)Sr2Ti2 tetrahedra, corners with two equivalent O(3)Sr2MgTi2 trigonal bipyramids, corners with two equivalent O(6)Ti4 trigonal pyramids, and edges with two equivalent O(7)Ti4 trigonal pyramids. In the seventh O site, O(7) is bonded to one Ti(2), one Ti(3), and two equivalent Ti(5) atoms to form OTi4 trigonal pyramids that share  a cornercorner with one O(1)Sr2Ti2 tetrahedra, corners with two equivalent O(9)Sr2Ti2 tetrahedra,  a cornercorner with one N(1)MgTi4 trigonal bipyramid,  a cornercorner with one O(3)Sr2MgTi2 trigonal bipyramid, corners with two equivalent O(7)Ti4 trigonal pyramids, and edges with two equivalent O(6)Ti4 trigonal pyramids. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), 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 tetrahedra that share corners with two equivalent O(1)Sr2Ti2 tetrahedra, corners with two equivalent O(9)Sr2Ti2 tetrahedra, corners with two equivalent N(1)MgTi4 trigonal bipyramids,  a cornercorner with one O(6)Ti4 trigonal pyramid, corners with two equivalent O(7)Ti4 trigonal pyramids, and  an edgeedge with one O(1)Sr2Ti2 tetrahedra. In the tenth O site, O(10) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(1), one Ti(5), and one Ti(6) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Ti(1), and one Ti(6) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2MgTi6N2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.867
_cell_length_b   7.930
_cell_length_c   9.479
_cell_angle_alpha   82.393
_cell_angle_beta   89.999
_cell_angle_gamma   75.883
_symmetry_Int_Tables_number   1
_cell_volume   279.276
_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  0.904  0.799  1.0
  Sr  Sr1  1  0.459  0.079  0.280  1.0
  Mg  Mg2  1  0.284  0.428  0.038  1.0
  Ti  Ti3  1  0.112  0.773  0.111  1.0
  Ti  Ti4  1  0.173  0.651  0.415  1.0
  Ti  Ti5  1  0.225  0.547  0.739  1.0
  Ti  Ti6  1  0.763  0.471  0.256  1.0
  Ti  Ti7  1  0.834  0.328  0.576  1.0
  Ti  Ti8  1  0.883  0.231  0.913  1.0
  N  N9  1  0.233  0.532  0.229  1.0
  N  N10  1  0.835  0.326  0.087  1.0
  O  O11  1  0.060  0.876  0.298  1.0
  O  O12  1  0.125  0.747  0.616  1.0
  O  O13  1  0.171  0.655  0.908  1.0
  O  O14  1  0.615  0.766  0.111  1.0
  O  O15  1  0.697  0.604  0.435  1.0
  O  O16  1  0.760  0.478  0.747  1.0
  O  O17  1  0.299  0.400  0.566  1.0
  O  O18  1  0.359  0.278  0.877  1.0
  O  O19  1  0.871  0.256  0.389  1.0
  O  O20  1  0.935  0.128  0.692  1.0
  O  O21  1  0.001  0.995  0.973  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 10-coordinate geometry to one O(4), one O(8), two equivalent O(10), 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 4-coordinate geometry to two equivalent O(1) and two equivalent O(9) atoms. Mg(1) is bonded to one N(1), two equivalent N(2), one O(3), and one O(8) atom to form MgN3O2 trigonal bipyramids that share  a cornercorner with one Ti(2)NO5 octahedra, corners with two equivalent Mg(1)N3O2 trigonal bipyramids,  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(6)NO5 octahedra. The corner-sharing octahedral tilt angles are 3°. 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(6)NO5 octahedra,  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  an edgeedge with one Mg(1)N3O2 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 2-22°. 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,  a cornercorner with one Mg(1)N3O2 trigonal bipyramid,  an edgeedge with one Ti(1)NO5 octahedra,  an edgeedge with one Ti(3)O6 octahedra, and edges with two equivalent Ti(4)N3O3 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 distorted 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(6)NO5 octahedra, and  an edgeedge with one Mg(1)N3O2 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 2-31°. 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  a cornercorner with one Ti(6)NO5 octahedra, corners with two equivalent Ti(4)N3O3 octahedra, edges with two equivalent Ti(1)NO5 octahedra, edges with two equivalent Ti(2)NO5 octahedra, and edges with two equivalent Mg(1)N3O2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 10-29°. 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(10), one O(11), one O(6), and two equivalent O(8) atoms to form distorted TiNO5 octahedra that share  a cornercorner with one Ti(4)N3O3 octahedra,  a cornercorner with one Ti(1)NO5 octahedra, corners with two equivalent Ti(6)NO5 octahedra, edges with two equivalent Ti(3)O6 octahedra, and edges with two equivalent Mg(1)N3O2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 10-27°. There are two inequivalent N sites. In the first N site, N(1) is bonded to one Mg(1), one Ti(1), one Ti(2), and two equivalent Ti(4) atoms to form NMgTi4 trigonal bipyramids that share corners with two equivalent O(9)Sr2Ti2 tetrahedra, corners with two equivalent N(1)MgTi4 trigonal bipyramids,  a cornercorner with one O(7)Ti4 trigonal pyramid,  an edgeedge with one O(1)Sr2Ti2 tetrahedra, and  an edgeedge with one O(3)Sr2MgTi2 trigonal bipyramid. In the second N site, N(2) is bonded in a distorted see-saw-like geometry to two equivalent 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 tetrahedra that share corners with two equivalent O(1)Sr2Ti2 tetrahedra, corners with two equivalent O(9)Sr2Ti2 tetrahedra,  a cornercorner with one O(3)Sr2MgTi2 trigonal bipyramid,  a cornercorner with one O(7)Ti4 trigonal pyramid,  an edgeedge with one O(9)Sr2Ti2 tetrahedra, and  an edgeedge with one N(1)MgTi4 trigonal bipyramid. 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 to two equivalent Sr(1), one Mg(1), one Ti(1), and one Ti(3) atom to form distorted OSr2MgTi2 trigonal bipyramids that share  a cornercorner with one O(1)Sr2Ti2 tetrahedra, corners with two equivalent O(3)Sr2MgTi2 trigonal bipyramids,  a cornercorner with one O(7)Ti4 trigonal pyramid, corners with two equivalent O(6)Ti4 trigonal pyramids, and  an edgeedge with one N(1)MgTi4 trigonal bipyramid. In the fourth O site, O(4) is bonded in a distorted linear geometry to one Sr(1), one Ti(4), and two equivalent Ti(1) atoms. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Ti(4), one Ti(5), and two equivalent Ti(2) atoms. In the sixth O site, O(6) is bonded to one Ti(5), one Ti(6), and two equivalent Ti(3) atoms to form distorted OTi4 trigonal pyramids that share  a cornercorner with one O(9)Sr2Ti2 tetrahedra, corners with two equivalent O(3)Sr2MgTi2 trigonal bipyramids, corners with two equivalent O(6)Ti4 trigonal pyramids, and edges with two equivalent O(7)Ti4 trigonal pyramids. In the seventh O site, O(7) is bonded to one Ti(2), one Ti(3), and two equivalent Ti(5) atoms to form OTi4 trigonal pyramids that share  a cornercorner with one O(1)Sr2Ti2 tetrahedra, corners with two equivalent O(9)Sr2Ti2 tetrahedra,  a cornercorner with one N(1)MgTi4 trigonal bipyramid,  a cornercorner with one O(3)Sr2MgTi2 trigonal bipyramid, corners with two equivalent O(7)Ti4 trigonal pyramids, and edges with two equivalent O(6)Ti4 trigonal pyramids. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), 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 tetrahedra that share corners with two equivalent O(1)Sr2Ti2 tetrahedra, corners with two equivalent O(9)Sr2Ti2 tetrahedra, corners with two equivalent N(1)MgTi4 trigonal bipyramids,  a cornercorner with one O(6)Ti4 trigonal pyramid, corners with two equivalent O(7)Ti4 trigonal pyramids, and  an edgeedge with one O(1)Sr2Ti2 tetrahedra. In the tenth O site, O(10) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(1), one Ti(5), and one Ti(6) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Ti(1), and one Ti(6) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2MgTi6N2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.867
_cell_length_b   7.930
_cell_length_c   9.479
_cell_angle_alpha   82.393
_cell_angle_beta   89.999
_cell_angle_gamma   75.883
_symmetry_Int_Tables_number   1
_cell_volume   279.276
_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  0.904  0.799  1.0
  Sr  Sr1  1  0.459  0.079  0.280  1.0
  Mg  Mg2  1  0.284  0.428  0.038  1.0
  Ti  Ti3  1  0.112  0.773  0.111  1.0
  Ti  Ti4  1  0.173  0.651  0.415  1.0
  Ti  Ti5  1  0.225  0.547  0.739  1.0
  Ti  Ti6  1  0.763  0.471  0.256  1.0
  Ti  Ti7  1  0.834  0.328  0.576  1.0
  Ti  Ti8  1  0.883  0.231  0.913  1.0
  N  N9  1  0.233  0.532  0.229  1.0
  N  N10  1  0.835  0.326  0.087  1.0
  O  O11  1  0.060  0.876  0.298  1.0
  O  O12  1  0.125  0.747  0.616  1.0
  O  O13  1  0.171  0.655  0.908  1.0
  O  O14  1  0.615  0.766  0.111  1.0
  O  O15  1  0.697  0.604  0.435  1.0
  O  O16  1  0.760  0.478  0.747  1.0
  O  O17  1  0.299  0.400  0.566  1.0
  O  O18  1  0.359  0.278  0.877  1.0
  O  O19  1  0.871  0.256  0.389  1.0
  O  O20  1  0.935  0.128  0.692  1.0
  O  O21  1  0.001  0.995  0.973  1.0
[/CIF]
.