The compound described by Sr2MgTi6N2O11 crystallizes in the triclinic P1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(6), one O(9), and two equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to two equivalent N(2), one O(11), one O(4), one O(9), and two equivalent O(1) atoms. Mg(1) is bonded in a 5-coordinate geometry to one O(11), one O(3), one O(8), and two equivalent O(10) 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(2)NO5 octahedra,  a cornercorner with one Ti(3)O5 trigonal bipyramid, corners with two equivalent Ti(1)NO4 trigonal bipyramids, and edges with two equivalent Ti(4)N3O2 trigonal bipyramids. The corner-sharing octahedral tilt angles are 63°. 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 distorted TiNO5 octahedra that share corners with two equivalent Ti(2)NO5 octahedra,  a cornercorner with one Ti(1)NO4 trigonal bipyramid,  a cornercorner with one Ti(3)O5 trigonal bipyramid, edges with two equivalent Ti(5)O5 square pyramids, and edges with two equivalent Ti(4)N3O2 trigonal bipyramids. The corner-sharing octahedral tilt angles are 27°. In the third Ti site, Ti(3) is bonded to one O(2), one O(3), one O(8), and two equivalent O(6) atoms to form TiO5 trigonal bipyramids that share  a cornercorner with one Ti(2)NO5 octahedra,  a cornercorner with one Ti(1)NO4 trigonal bipyramid, and corners with two equivalent Ti(3)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 38°. In the fourth Ti site, Ti(4) is bonded to one N(2), two equivalent N(1), one O(4), and one O(5) atom to form distorted TiN3O2 trigonal bipyramids that share  a cornercorner with one Ti(5)O5 square pyramid, corners with two equivalent Ti(4)N3O2 trigonal bipyramids, edges with two equivalent Ti(2)NO5 octahedra, and edges with two equivalent Ti(1)NO4 trigonal bipyramids. In the fifth Ti site, Ti(5) is bonded to one O(10), one O(5), one O(9), and two equivalent O(7) atoms to form distorted TiO5 square pyramids that share corners with two equivalent Ti(5)O5 square pyramids,  a cornercorner with one Ti(4)N3O2 trigonal bipyramid, and edges with two equivalent Ti(2)NO5 octahedra. In the sixth Ti site, Ti(6) is bonded in a 5-coordinate geometry to one N(2), 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 in a 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 rectangular see-saw-like 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 4-coordinate geometry to one Sr(1), two equivalent Sr(2), and one Ti(2) atom. 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(10)SrMg2Ti trigonal pyramids, and corners with two equivalent O(5)Ti4 trigonal pyramids. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one Ti(1), and one Ti(3) atom. In the fourth O site, O(4) is bonded in a T-shaped geometry to one Sr(2), 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(2)Sr2Ti2 tetrahedra,  a cornercorner with one O(10)SrMg2Ti trigonal pyramid, and corners with two equivalent O(5)Ti4 trigonal pyramids. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Sr(1), one Ti(6), and two equivalent Ti(3) atoms. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Ti(2) and two equivalent Ti(5) atoms. In the eighth O site, O(8) is bonded in a distorted see-saw-like geometry to one Mg(1), one Ti(3), and two equivalent Ti(6) atoms. In the ninth O site, O(9) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(2), and one Ti(5) atom. In the tenth O site, O(10) is bonded to one Sr(1), two equivalent Mg(1), and one Ti(5) atom to form distorted OSrMg2Ti trigonal pyramids that share corners with two equivalent O(2)Sr2Ti2 tetrahedra,  a cornercorner with one O(5)Ti4 trigonal pyramid, and corners with two equivalent O(10)SrMg2Ti trigonal pyramids. In the eleventh O site, O(11) is bonded in a distorted see-saw-like geometry to one Sr(2), one 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   8.237
_cell_length_c   9.984
_cell_angle_alpha   74.767
_cell_angle_beta   89.936
_cell_angle_gamma   69.160
_symmetry_Int_Tables_number   1
_cell_volume   288.948
_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  0.412  0.858  0.591  1.0
  Sr  Sr1  1  0.498  0.094  0.228  1.0
  Mg  Mg2  1  0.630  0.072  0.824  1.0
  Ti  Ti3  1  0.082  0.776  0.065  1.0
  Ti  Ti4  1  0.202  0.614  0.420  1.0
  Ti  Ti5  1  0.138  0.567  0.807  1.0
  Ti  Ti6  1  0.755  0.523  0.221  1.0
  Ti  Ti7  1  0.975  0.289  0.558  1.0
  Ti  Ti8  1  0.838  0.303  0.956  1.0
  N  N9  1  0.226  0.564  0.234  1.0
  N  N10  1  0.847  0.340  0.126  1.0
  O  O11  1  0.083  0.856  0.355  1.0
  O  O12  1  0.063  0.675  0.614  1.0
  O  O13  1  0.994  0.773  0.877  1.0
  O  O14  1  0.578  0.773  0.098  1.0
  O  O15  1  0.750  0.550  0.430  1.0
  O  O16  1  0.662  0.542  0.804  1.0
  O  O17  1  0.429  0.339  0.571  1.0
  O  O18  1  0.337  0.302  0.897  1.0
  O  O19  1  0.094  0.171  0.431  1.0
  O  O20  1  0.120  0.099  0.727  1.0
  O  O21  1  0.911  0.039  0.018  1.0
[/CIF]
.
The compound described by Sr2MgTi6N2O11 crystallizes in the triclinic P1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(6), one O(9), and two equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to two equivalent N(2), one O(11), one O(4), one O(9), and two equivalent O(1) atoms. Mg(1) is bonded in a 5-coordinate geometry to one O(11), one O(3), one O(8), and two equivalent O(10) 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(2)NO5 octahedra,  a cornercorner with one Ti(3)O5 trigonal bipyramid, corners with two equivalent Ti(1)NO4 trigonal bipyramids, and edges with two equivalent Ti(4)N3O2 trigonal bipyramids. The corner-sharing octahedral tilt angles are 63°. 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 distorted TiNO5 octahedra that share corners with two equivalent Ti(2)NO5 octahedra,  a cornercorner with one Ti(1)NO4 trigonal bipyramid,  a cornercorner with one Ti(3)O5 trigonal bipyramid, edges with two equivalent Ti(5)O5 square pyramids, and edges with two equivalent Ti(4)N3O2 trigonal bipyramids. The corner-sharing octahedral tilt angles are 27°. In the third Ti site, Ti(3) is bonded to one O(2), one O(3), one O(8), and two equivalent O(6) atoms to form TiO5 trigonal bipyramids that share  a cornercorner with one Ti(2)NO5 octahedra,  a cornercorner with one Ti(1)NO4 trigonal bipyramid, and corners with two equivalent Ti(3)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 38°. In the fourth Ti site, Ti(4) is bonded to one N(2), two equivalent N(1), one O(4), and one O(5) atom to form distorted TiN3O2 trigonal bipyramids that share  a cornercorner with one Ti(5)O5 square pyramid, corners with two equivalent Ti(4)N3O2 trigonal bipyramids, edges with two equivalent Ti(2)NO5 octahedra, and edges with two equivalent Ti(1)NO4 trigonal bipyramids. In the fifth Ti site, Ti(5) is bonded to one O(10), one O(5), one O(9), and two equivalent O(7) atoms to form distorted TiO5 square pyramids that share corners with two equivalent Ti(5)O5 square pyramids,  a cornercorner with one Ti(4)N3O2 trigonal bipyramid, and edges with two equivalent Ti(2)NO5 octahedra. In the sixth Ti site, Ti(6) is bonded in a 5-coordinate geometry to one N(2), 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 in a 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 rectangular see-saw-like 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 4-coordinate geometry to one Sr(1), two equivalent Sr(2), and one Ti(2) atom. 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(10)SrMg2Ti trigonal pyramids, and corners with two equivalent O(5)Ti4 trigonal pyramids. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one Ti(1), and one Ti(3) atom. In the fourth O site, O(4) is bonded in a T-shaped geometry to one Sr(2), 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(2)Sr2Ti2 tetrahedra,  a cornercorner with one O(10)SrMg2Ti trigonal pyramid, and corners with two equivalent O(5)Ti4 trigonal pyramids. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Sr(1), one Ti(6), and two equivalent Ti(3) atoms. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Ti(2) and two equivalent Ti(5) atoms. In the eighth O site, O(8) is bonded in a distorted see-saw-like geometry to one Mg(1), one Ti(3), and two equivalent Ti(6) atoms. In the ninth O site, O(9) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(2), and one Ti(5) atom. In the tenth O site, O(10) is bonded to one Sr(1), two equivalent Mg(1), and one Ti(5) atom to form distorted OSrMg2Ti trigonal pyramids that share corners with two equivalent O(2)Sr2Ti2 tetrahedra,  a cornercorner with one O(5)Ti4 trigonal pyramid, and corners with two equivalent O(10)SrMg2Ti trigonal pyramids. In the eleventh O site, O(11) is bonded in a distorted see-saw-like geometry to one Sr(2), one 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   8.237
_cell_length_c   9.984
_cell_angle_alpha   74.767
_cell_angle_beta   89.936
_cell_angle_gamma   69.160
_symmetry_Int_Tables_number   1
_cell_volume   288.948
_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  0.412  0.858  0.591  1.0
  Sr  Sr1  1  0.498  0.094  0.228  1.0
  Mg  Mg2  1  0.630  0.072  0.824  1.0
  Ti  Ti3  1  0.082  0.776  0.065  1.0
  Ti  Ti4  1  0.202  0.614  0.420  1.0
  Ti  Ti5  1  0.138  0.567  0.807  1.0
  Ti  Ti6  1  0.755  0.523  0.221  1.0
  Ti  Ti7  1  0.975  0.289  0.558  1.0
  Ti  Ti8  1  0.838  0.303  0.956  1.0
  N  N9  1  0.226  0.564  0.234  1.0
  N  N10  1  0.847  0.340  0.126  1.0
  O  O11  1  0.083  0.856  0.355  1.0
  O  O12  1  0.063  0.675  0.614  1.0
  O  O13  1  0.994  0.773  0.877  1.0
  O  O14  1  0.578  0.773  0.098  1.0
  O  O15  1  0.750  0.550  0.430  1.0
  O  O16  1  0.662  0.542  0.804  1.0
  O  O17  1  0.429  0.339  0.571  1.0
  O  O18  1  0.337  0.302  0.897  1.0
  O  O19  1  0.094  0.171  0.431  1.0
  O  O20  1  0.120  0.099  0.727  1.0
  O  O21  1  0.911  0.039  0.018  1.0
[/CIF]
.