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 8-coordinate geometry to one O(4), one O(8), two equivalent O(10), two equivalent O(11), and two equivalent O(3) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one N(1), two equivalent N(2), two equivalent O(1), and two equivalent O(9) atoms. Mg(1) is bonded in a distorted square co-planar geometry to one O(10), one O(2), one O(3), and one O(9) atom. 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), and two equivalent O(4) atoms to form TiNO4 trigonal bipyramids that share  a cornercorner with one Ti(6)NO4 trigonal bipyramid, corners with two equivalent Ti(1)NO4 trigonal bipyramids, and  an edgeedge with one Ti(2)NO5 octahedra. 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)NO4 trigonal bipyramid, and edges with two equivalent Ti(5)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 24°. In the third Ti site, Ti(3) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(8), and two equivalent O(6) atoms. In the fourth Ti site, Ti(4) is bonded in a 5-coordinate geometry to one N(2), two equivalent N(1), one O(4), and one O(5) atom. 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 trigonal bipyramids that share corners with two equivalent Ti(5)O5 trigonal bipyramids and edges with two equivalent Ti(2)NO5 octahedra. 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 corner-sharing TiNO4 trigonal bipyramids. There are two inequivalent N sites. In the first N site, N(1) is bonded in a 5-coordinate geometry to one Sr(2), 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 two equivalent Sr(2), one Ti(1), and one Ti(2) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Mg(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 Mg(1), and one Ti(3) atom. In the fourth O site, O(4) is bonded to one Sr(1), one Ti(4), and two equivalent Ti(1) atoms to form distorted OSrTi3 trigonal pyramids that share  a cornercorner with one O(5)Ti4 trigonal pyramid, corners with two equivalent O(10)Sr2MgTi trigonal pyramids, corners with two equivalent O(4)SrTi3 trigonal pyramids, and edges with two equivalent O(11)Sr2Ti2 trigonal pyramids. 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  a cornercorner with one O(10)Sr2MgTi trigonal pyramid,  a cornercorner with one O(4)SrTi3 trigonal pyramid, and corners with two equivalent O(5)Ti4 trigonal pyramids. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to 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 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 4-coordinate geometry to two equivalent Sr(2), one Mg(1), and one Ti(5) atom. In the tenth O site, O(10) is bonded to two equivalent Sr(1), one Mg(1), and one Ti(5) atom to form distorted OSr2MgTi trigonal pyramids that share  a cornercorner with one O(5)Ti4 trigonal pyramid, corners with two equivalent O(10)Sr2MgTi trigonal pyramids, corners with two equivalent O(11)Sr2Ti2 trigonal pyramids, corners with two equivalent O(4)SrTi3 trigonal pyramids, and  an edgeedge with one O(11)Sr2Ti2 trigonal pyramid. In the eleventh O site, O(11) is bonded to two equivalent Sr(1), one Ti(1), and one Ti(6) atom to form distorted OSr2Ti2 trigonal pyramids that share corners with two equivalent O(10)Sr2MgTi trigonal pyramids, corners with two equivalent O(11)Sr2Ti2 trigonal pyramids,  an edgeedge with one O(10)Sr2MgTi trigonal pyramid, and edges with two equivalent O(4)SrTi3 trigonal pyramids. is represented by the CIF card [CIF]
data_Sr2MgTi6N2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.802
_cell_length_b   7.999
_cell_length_c   10.700
_cell_angle_alpha   72.972
_cell_angle_beta   89.998
_cell_angle_gamma   76.258
_symmetry_Int_Tables_number   1
_cell_volume   301.403
_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  0.508  0.981  0.865  1.0
  Sr  Sr1  1  0.438  0.121  0.277  1.0
  Mg  Mg2  1  0.039  0.919  0.615  1.0
  Ti  Ti3  1  0.107  0.782  0.142  1.0
  Ti  Ti4  1  0.192  0.612  0.413  1.0
  Ti  Ti5  1  0.222  0.553  0.759  1.0
  Ti  Ti6  1  0.746  0.504  0.208  1.0
  Ti  Ti7  1  0.852  0.293  0.548  1.0
  Ti  Ti8  1  0.857  0.283  0.964  1.0
  N  N9  1  0.246  0.505  0.264  1.0
  N  N10  1  0.838  0.321  0.126  1.0
  O  O11  1  0.066  0.864  0.291  1.0
  O  O12  1  0.153  0.691  0.580  1.0
  O  O13  1  0.122  0.753  0.810  1.0
  O  O14  1  0.621  0.755  0.091  1.0
  O  O15  1  0.720  0.556  0.425  1.0
  O  O16  1  0.755  0.487  0.782  1.0
  O  O17  1  0.322  0.352  0.558  1.0
  O  O18  1  0.345  0.306  0.907  1.0
  O  O19  1  0.932  0.133  0.450  1.0
  O  O20  1  0.943  0.110  0.703  1.0
  O  O21  1  0.983  0.031  0.005  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 8-coordinate geometry to one O(4), one O(8), two equivalent O(10), two equivalent O(11), and two equivalent O(3) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one N(1), two equivalent N(2), two equivalent O(1), and two equivalent O(9) atoms. Mg(1) is bonded in a distorted square co-planar geometry to one O(10), one O(2), one O(3), and one O(9) atom. 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), and two equivalent O(4) atoms to form TiNO4 trigonal bipyramids that share  a cornercorner with one Ti(6)NO4 trigonal bipyramid, corners with two equivalent Ti(1)NO4 trigonal bipyramids, and  an edgeedge with one Ti(2)NO5 octahedra. 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)NO4 trigonal bipyramid, and edges with two equivalent Ti(5)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 24°. In the third Ti site, Ti(3) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(8), and two equivalent O(6) atoms. In the fourth Ti site, Ti(4) is bonded in a 5-coordinate geometry to one N(2), two equivalent N(1), one O(4), and one O(5) atom. 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 trigonal bipyramids that share corners with two equivalent Ti(5)O5 trigonal bipyramids and edges with two equivalent Ti(2)NO5 octahedra. 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 corner-sharing TiNO4 trigonal bipyramids. There are two inequivalent N sites. In the first N site, N(1) is bonded in a 5-coordinate geometry to one Sr(2), 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 two equivalent Sr(2), one Ti(1), and one Ti(2) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Mg(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 Mg(1), and one Ti(3) atom. In the fourth O site, O(4) is bonded to one Sr(1), one Ti(4), and two equivalent Ti(1) atoms to form distorted OSrTi3 trigonal pyramids that share  a cornercorner with one O(5)Ti4 trigonal pyramid, corners with two equivalent O(10)Sr2MgTi trigonal pyramids, corners with two equivalent O(4)SrTi3 trigonal pyramids, and edges with two equivalent O(11)Sr2Ti2 trigonal pyramids. 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  a cornercorner with one O(10)Sr2MgTi trigonal pyramid,  a cornercorner with one O(4)SrTi3 trigonal pyramid, and corners with two equivalent O(5)Ti4 trigonal pyramids. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to 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 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 4-coordinate geometry to two equivalent Sr(2), one Mg(1), and one Ti(5) atom. In the tenth O site, O(10) is bonded to two equivalent Sr(1), one Mg(1), and one Ti(5) atom to form distorted OSr2MgTi trigonal pyramids that share  a cornercorner with one O(5)Ti4 trigonal pyramid, corners with two equivalent O(10)Sr2MgTi trigonal pyramids, corners with two equivalent O(11)Sr2Ti2 trigonal pyramids, corners with two equivalent O(4)SrTi3 trigonal pyramids, and  an edgeedge with one O(11)Sr2Ti2 trigonal pyramid. In the eleventh O site, O(11) is bonded to two equivalent Sr(1), one Ti(1), and one Ti(6) atom to form distorted OSr2Ti2 trigonal pyramids that share corners with two equivalent O(10)Sr2MgTi trigonal pyramids, corners with two equivalent O(11)Sr2Ti2 trigonal pyramids,  an edgeedge with one O(10)Sr2MgTi trigonal pyramid, and edges with two equivalent O(4)SrTi3 trigonal pyramids. is represented by the CIF card [CIF]
data_Sr2MgTi6N2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.802
_cell_length_b   7.999
_cell_length_c   10.700
_cell_angle_alpha   72.972
_cell_angle_beta   89.998
_cell_angle_gamma   76.258
_symmetry_Int_Tables_number   1
_cell_volume   301.403
_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  0.508  0.981  0.865  1.0
  Sr  Sr1  1  0.438  0.121  0.277  1.0
  Mg  Mg2  1  0.039  0.919  0.615  1.0
  Ti  Ti3  1  0.107  0.782  0.142  1.0
  Ti  Ti4  1  0.192  0.612  0.413  1.0
  Ti  Ti5  1  0.222  0.553  0.759  1.0
  Ti  Ti6  1  0.746  0.504  0.208  1.0
  Ti  Ti7  1  0.852  0.293  0.548  1.0
  Ti  Ti8  1  0.857  0.283  0.964  1.0
  N  N9  1  0.246  0.505  0.264  1.0
  N  N10  1  0.838  0.321  0.126  1.0
  O  O11  1  0.066  0.864  0.291  1.0
  O  O12  1  0.153  0.691  0.580  1.0
  O  O13  1  0.122  0.753  0.810  1.0
  O  O14  1  0.621  0.755  0.091  1.0
  O  O15  1  0.720  0.556  0.425  1.0
  O  O16  1  0.755  0.487  0.782  1.0
  O  O17  1  0.322  0.352  0.558  1.0
  O  O18  1  0.345  0.306  0.907  1.0
  O  O19  1  0.932  0.133  0.450  1.0
  O  O20  1  0.943  0.110  0.703  1.0
  O  O21  1  0.983  0.031  0.005  1.0
[/CIF]
.