The structure described by Sr2CaTi6N2O11 crystallizes in the triclinic P1 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 10-coordinate geometry to one O(5), one O(7), two equivalent O(1), two equivalent O(10), two equivalent O(2), and two equivalent O(9) atoms. Ca(1) is bonded in a 8-coordinate geometry to two equivalent N(2), one O(4), one O(8), two equivalent O(1), 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 distorted TiNO4 square pyramids that share  a cornercorner with one Ti(2)NO5 octahedra,  a cornercorner with one Ti(3)O6 octahedra, corners with two equivalent Ti(1)NO4 square pyramids, and  a cornercorner with one Ti(6)NO4 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 17-67°. 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 square pyramid,  an edgeedge with one Ti(3)O6 octahedra, and edges with two equivalent Ti(5)O6 octahedra. The corner-sharing octahedral tilt angles are 19°. 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 square pyramid,  an edgeedge with one Ti(2)NO5 octahedra, edges with two equivalent Ti(5)O6 octahedra, and edges with two equivalent Ti(6)NO4 trigonal bipyramids. The corner-sharing octahedral tilt angles are 25°. In the fourth Ti site, Ti(4) is bonded in a 6-coordinate geometry to one N(2), two equivalent N(1), one O(4), one O(5), and one O(9) atom. 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 Ti(6)NO4 trigonal bipyramid, edges with two equivalent Ti(2)NO5 octahedra, and edges with two equivalent Ti(3)O6 octahedra. The corner-sharing octahedral tilt angles are 22°. 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(5)O6 octahedra,  a cornercorner with one Ti(1)NO4 square pyramid, 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 72°. There are two inequivalent N sites. In the first N site, N(1) is bonded to one Ti(1), one Ti(2), and two equivalent Ti(4) atoms to form NTi4 tetrahedra that share  a cornercorner with one O(11)Sr2Ca2Ti2 octahedra, corners with two equivalent N(1)Ti4 tetrahedra, and  a cornercorner with one O(7)SrTi4 trigonal pyramid. The corner-sharing octahedral tilt angles are 45°. In the second N site, N(2) is bonded in a 4-coordinate geometry to two equivalent Ca(1), 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 1-coordinate geometry to two equivalent Sr(2), two equivalent Ca(1), and one Ti(2) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(2), 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 5-coordinate geometry to one Sr(1), one Ca(1), one Ti(4), and two equivalent Ti(1) atoms. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Sr(2), 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 tetrahedra that share  a cornercorner with one O(11)Sr2Ca2Ti2 octahedra, corners with two equivalent O(6)Ti4 tetrahedra, and edges with two equivalent O(7)SrTi4 trigonal pyramids. The corner-sharing octahedral tilt angles are 39°. In the seventh O site, O(7) is bonded to one Sr(2), one Ti(2), one Ti(3), and two equivalent Ti(5) atoms to form distorted OSrTi4 trigonal pyramids that share  a cornercorner with one N(1)Ti4 tetrahedra, corners with two equivalent O(7)SrTi4 trigonal pyramids, and edges with two equivalent O(6)Ti4 tetrahedra. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Sr(1), one Ca(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 Ti(4), and one Ti(5) atom. In the tenth O site, O(10) is bonded in a 1-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and one Ti(5) atom. In the eleventh O site, O(11) is bonded to two equivalent Sr(1), two equivalent Ca(1), one Ti(1), and one Ti(6) atom to form distorted OSr2Ca2Ti2 octahedra that share  a cornercorner with one N(1)Ti4 tetrahedra,  a cornercorner with one O(6)Ti4 tetrahedra, and edges with two equivalent O(11)Sr2Ca2Ti2 octahedra. is represented by the CIF file [CIF]
data_Sr2CaTi6N2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.875
_cell_length_b   7.439
_cell_length_c   10.121
_cell_angle_alpha   76.600
_cell_angle_beta   90.118
_cell_angle_gamma   74.953
_symmetry_Int_Tables_number   1
_cell_volume   273.479
_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  0.503  0.935  0.823  1.0
  Sr  Sr1  1  0.487  0.013  0.474  1.0
  Ca  Ca2  1  0.447  0.052  0.139  1.0
  Ti  Ti3  1  0.117  0.713  0.060  1.0
  Ti  Ti4  1  0.145  0.666  0.392  1.0
  Ti  Ti5  1  0.201  0.551  0.725  1.0
  Ti  Ti6  1  0.750  0.454  0.238  1.0
  Ti  Ti7  1  0.800  0.354  0.577  1.0
  Ti  Ti8  1  0.836  0.276  0.927  1.0
  N  N9  1  0.210  0.533  0.244  1.0
  N  N10  1  0.818  0.316  0.099  1.0
  O  O11  1  0.013  0.917  0.298  1.0
  O  O12  1  0.095  0.773  0.592  1.0
  O  O13  1  0.136  0.674  0.885  1.0
  O  O14  1  0.605  0.739  0.089  1.0
  O  O15  1  0.658  0.637  0.422  1.0
  O  O16  1  0.731  0.491  0.747  1.0
  O  O17  1  0.273  0.406  0.561  1.0
  O  O18  1  0.341  0.267  0.885  1.0
  O  O19  1  0.853  0.256  0.405  1.0
  O  O20  1  0.911  0.115  0.684  1.0
  O  O21  1  0.975  0.999  0.991  1.0
[/CIF]
.
The structure described by Sr2CaTi6N2O11 crystallizes in the triclinic P1 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 10-coordinate geometry to one O(5), one O(7), two equivalent O(1), two equivalent O(10), two equivalent O(2), and two equivalent O(9) atoms. Ca(1) is bonded in a 8-coordinate geometry to two equivalent N(2), one O(4), one O(8), two equivalent O(1), 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 distorted TiNO4 square pyramids that share  a cornercorner with one Ti(2)NO5 octahedra,  a cornercorner with one Ti(3)O6 octahedra, corners with two equivalent Ti(1)NO4 square pyramids, and  a cornercorner with one Ti(6)NO4 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 17-67°. 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 square pyramid,  an edgeedge with one Ti(3)O6 octahedra, and edges with two equivalent Ti(5)O6 octahedra. The corner-sharing octahedral tilt angles are 19°. 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 square pyramid,  an edgeedge with one Ti(2)NO5 octahedra, edges with two equivalent Ti(5)O6 octahedra, and edges with two equivalent Ti(6)NO4 trigonal bipyramids. The corner-sharing octahedral tilt angles are 25°. In the fourth Ti site, Ti(4) is bonded in a 6-coordinate geometry to one N(2), two equivalent N(1), one O(4), one O(5), and one O(9) atom. 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 Ti(6)NO4 trigonal bipyramid, edges with two equivalent Ti(2)NO5 octahedra, and edges with two equivalent Ti(3)O6 octahedra. The corner-sharing octahedral tilt angles are 22°. 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(5)O6 octahedra,  a cornercorner with one Ti(1)NO4 square pyramid, 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 72°. There are two inequivalent N sites. In the first N site, N(1) is bonded to one Ti(1), one Ti(2), and two equivalent Ti(4) atoms to form NTi4 tetrahedra that share  a cornercorner with one O(11)Sr2Ca2Ti2 octahedra, corners with two equivalent N(1)Ti4 tetrahedra, and  a cornercorner with one O(7)SrTi4 trigonal pyramid. The corner-sharing octahedral tilt angles are 45°. In the second N site, N(2) is bonded in a 4-coordinate geometry to two equivalent Ca(1), 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 1-coordinate geometry to two equivalent Sr(2), two equivalent Ca(1), and one Ti(2) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(2), 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 5-coordinate geometry to one Sr(1), one Ca(1), one Ti(4), and two equivalent Ti(1) atoms. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Sr(2), 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 tetrahedra that share  a cornercorner with one O(11)Sr2Ca2Ti2 octahedra, corners with two equivalent O(6)Ti4 tetrahedra, and edges with two equivalent O(7)SrTi4 trigonal pyramids. The corner-sharing octahedral tilt angles are 39°. In the seventh O site, O(7) is bonded to one Sr(2), one Ti(2), one Ti(3), and two equivalent Ti(5) atoms to form distorted OSrTi4 trigonal pyramids that share  a cornercorner with one N(1)Ti4 tetrahedra, corners with two equivalent O(7)SrTi4 trigonal pyramids, and edges with two equivalent O(6)Ti4 tetrahedra. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Sr(1), one Ca(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 Ti(4), and one Ti(5) atom. In the tenth O site, O(10) is bonded in a 1-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and one Ti(5) atom. In the eleventh O site, O(11) is bonded to two equivalent Sr(1), two equivalent Ca(1), one Ti(1), and one Ti(6) atom to form distorted OSr2Ca2Ti2 octahedra that share  a cornercorner with one N(1)Ti4 tetrahedra,  a cornercorner with one O(6)Ti4 tetrahedra, and edges with two equivalent O(11)Sr2Ca2Ti2 octahedra. is represented by the CIF file [CIF]
data_Sr2CaTi6N2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.875
_cell_length_b   7.439
_cell_length_c   10.121
_cell_angle_alpha   76.600
_cell_angle_beta   90.118
_cell_angle_gamma   74.953
_symmetry_Int_Tables_number   1
_cell_volume   273.479
_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  0.503  0.935  0.823  1.0
  Sr  Sr1  1  0.487  0.013  0.474  1.0
  Ca  Ca2  1  0.447  0.052  0.139  1.0
  Ti  Ti3  1  0.117  0.713  0.060  1.0
  Ti  Ti4  1  0.145  0.666  0.392  1.0
  Ti  Ti5  1  0.201  0.551  0.725  1.0
  Ti  Ti6  1  0.750  0.454  0.238  1.0
  Ti  Ti7  1  0.800  0.354  0.577  1.0
  Ti  Ti8  1  0.836  0.276  0.927  1.0
  N  N9  1  0.210  0.533  0.244  1.0
  N  N10  1  0.818  0.316  0.099  1.0
  O  O11  1  0.013  0.917  0.298  1.0
  O  O12  1  0.095  0.773  0.592  1.0
  O  O13  1  0.136  0.674  0.885  1.0
  O  O14  1  0.605  0.739  0.089  1.0
  O  O15  1  0.658  0.637  0.422  1.0
  O  O16  1  0.731  0.491  0.747  1.0
  O  O17  1  0.273  0.406  0.561  1.0
  O  O18  1  0.341  0.267  0.885  1.0
  O  O19  1  0.853  0.256  0.405  1.0
  O  O20  1  0.911  0.115  0.684  1.0
  O  O21  1  0.975  0.999  0.991  1.0
[/CIF]
.