The crystal structure described by Sr6Nb2O11 is Pb (Zr_0.50 Ti_0.48) O_3-like structured and crystallizes in the triclinic P1 space group. There are twelve inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(14), one O(19), one O(4), one O(5), and two equivalent O(3) atoms. In the second Sr site, Sr(2) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(5) atom to form distorted SrO5 square pyramids that share corners with three equivalent Nb(2)O6 octahedra and corners with two equivalent Nb(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 10-45°. In the third Sr site, Sr(3) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the fourth Sr site, Sr(4) is bonded in a 6-coordinate geometry to one O(10), one O(15), one O(6), one O(7), one O(8), and one O(9) atom. In the fifth Sr site, Sr(5) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(8), and one O(9) atom. In the sixth Sr site, Sr(6) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(12), one O(13), one O(15), and one O(16) atom. In the seventh Sr site, Sr(7) is bonded to one O(11), one O(12), one O(13), one O(15), one O(16), and one O(17) atom to form distorted SrO6 octahedra that share corners with three equivalent Nb(4)O6 octahedra and corners with three equivalent Nb(3)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 10-30°. In the eighth Sr site, Sr(8) is bonded in a 4-coordinate geometry to one O(16), one O(17), one O(18), one O(21), one O(22), and two equivalent O(20) atoms. In the ninth Sr site, Sr(9) is bonded in a 6-coordinate geometry to one O(10), one O(13), one O(15), one O(7), one O(8), and one O(9) atom. In the tenth Sr site, Sr(10) is bonded in a 6-coordinate geometry to one O(14), one O(18), one O(19), one O(20), one O(21), and one O(22) atom. In the eleventh Sr site, Sr(11) is bonded in a 7-coordinate geometry to one O(11), one O(12), one O(16), one O(17), one O(18), one O(20), and one O(21) atom. In the twelfth Sr site, Sr(12) is bonded in a 6-coordinate geometry to one O(14), one O(19), one O(20), one O(21), one O(22), and one O(3) atom. There are four inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(14), one O(19), one O(22), one O(3), and one O(4) atom to form distorted NbO5 trigonal bipyramids that share corners with two equivalent Sr(2)O5 square pyramids. In the second Nb site, Nb(2) is bonded to one O(1), one O(2), one O(5), one O(6), one O(8), and one O(9) atom to form NbO6 octahedra that share corners with three equivalent Sr(2)O5 square pyramids. In the third Nb site, Nb(3) is bonded to one O(10), one O(11), one O(13), one O(15), and one O(7) atom to form distorted NbO5 trigonal bipyramids that share corners with three equivalent Sr(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-60°. In the fourth Nb site, Nb(4) is bonded to one O(12), one O(16), one O(17), one O(18), one O(20), and one O(21) atom to form distorted NbO6 octahedra that share corners with three equivalent Sr(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-30°. There are twenty-two inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(5), and one Nb(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(3), one Sr(5), and one Nb(2) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Sr(12), one Sr(2), two equivalent Sr(1), and one Nb(1) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Sr(1), one Sr(2), one Sr(5), and one Nb(1) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(5), and one Nb(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(4), one Sr(5), and one Nb(2) atom. In the seventh O site, O(7) is bonded in a distorted see-saw-like geometry to one Sr(3), one Sr(4), one Sr(9), and one Nb(3) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Sr(3), one Sr(4), one Sr(5), one Sr(9), and one Nb(2) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Sr(3), one Sr(4), one Sr(5), one Sr(9), and one Nb(2) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Sr(4), one Sr(6), one Sr(9), and one Nb(3) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(11), one Sr(6), one Sr(7), and one Nb(3) atom. In the twelfth O site, O(12) is bonded in a 2-coordinate geometry to one Sr(11), one Sr(6), one Sr(7), and one Nb(4) atom. In the thirteenth O site, O(13) is bonded in a distorted see-saw-like geometry to one Sr(6), one Sr(7), one Sr(9), and one Nb(3) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal pyramidal geometry to one Sr(1), one Sr(10), one Sr(12), and one Nb(1) atom. In the fifteenth O site, O(15) is bonded in a 5-coordinate geometry to one Sr(4), one Sr(6), one Sr(7), one Sr(9), and one Nb(3) atom. In the sixteenth O site, O(16) is bonded in a 5-coordinate geometry to one Sr(11), one Sr(6), one Sr(7), one Sr(8), and one Nb(4) atom. In the seventeenth O site, O(17) is bonded in a distorted rectangular see-saw-like geometry to one Sr(11), one Sr(7), one Sr(8), and one Nb(4) atom. In the eighteenth O site, O(18) is bonded in a 2-coordinate geometry to one Sr(10), one Sr(11), one Sr(8), and one Nb(4) atom. In the nineteenth O site, O(19) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(10), one Sr(12), and one Nb(1) atom. In the twentieth O site, O(20) is bonded in a 6-coordinate geometry to one Sr(10), one Sr(11), one Sr(12), two equivalent Sr(8), and one Nb(4) atom. In the twenty-first O site, O(21) is bonded in a 4-coordinate geometry to one Sr(10), one Sr(11), one Sr(12), one Sr(8), and one Nb(4) atom. In the twenty-second O site, O(22) is bonded in a distorted rectangular see-saw-like geometry to one Sr(10), one Sr(12), one Sr(8), and one Nb(1) atom. is represented by the CIF card [CIF]
data_Sr6Nb2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.997
_cell_length_b   6.019
_cell_length_c   19.837
_cell_angle_alpha   97.348
_cell_angle_beta   90.398
_cell_angle_gamma   119.663
_symmetry_Int_Tables_number   1
_cell_volume   615.069
_cell_formula_units_Z   2
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  0.299  0.598  0.930  1.0
  Sr  Sr1  1  0.695  0.309  0.883  1.0
  Sr  Sr2  1  0.821  0.440  0.703  1.0
  Sr  Sr3  1  0.159  0.123  0.623  1.0
  Sr  Sr4  1  0.039  0.997  0.802  1.0
  Sr  Sr5  1  0.363  0.204  0.425  1.0
  Sr  Sr6  1  0.717  0.871  0.384  1.0
  Sr  Sr7  1  0.826  0.924  0.201  1.0
  Sr  Sr8  1  0.503  0.797  0.575  1.0
  Sr  Sr9  1  0.210  0.617  0.117  1.0
  Sr  Sr10  1  0.053  0.539  0.296  1.0
  Sr  Sr11  1  0.543  0.303  0.077  1.0
  Nb  Nb12  1  0.980  0.948  0.003  1.0
  Nb  Nb13  1  0.431  0.719  0.752  1.0
  Nb  Nb14  1  0.929  0.497  0.500  1.0
  Nb  Nb15  1  0.445  0.216  0.251  1.0
  O  O16  1  0.580  0.569  0.815  1.0
  O  O17  1  0.651  0.059  0.787  1.0
  O  O18  1  0.825  0.596  0.972  1.0
  O  O19  1  0.960  0.112  0.921  1.0
  O  O20  1  0.132  0.639  0.829  1.0
  O  O21  1  0.228  0.377  0.717  1.0
  O  O22  1  0.022  0.433  0.586  1.0
  O  O23  1  0.723  0.795  0.671  1.0
  O  O24  1  0.277  0.868  0.692  1.0
  O  O25  1  0.552  0.236  0.540  1.0
  O  O26  1  0.839  0.320  0.418  1.0
  O  O27  1  0.596  0.518  0.307  1.0
  O  O28  1  0.303  0.615  0.462  1.0
  O  O29  1  0.304  0.938  0.004  1.0
  O  O30  1  0.920  0.813  0.496  1.0
  O  O31  1  0.152  0.002  0.330  1.0
  O  O32  1  0.644  0.072  0.293  1.0
  O  O33  1  0.249  0.912  0.197  1.0
  O  O34  1  0.166  0.298  0.037  1.0
  O  O35  1  0.758  0.365  0.175  1.0
  O  O36  1  0.271  0.375  0.204  1.0
  O  O37  1  0.710  0.812  0.083  1.0
[/CIF]
.
The crystal structure described by Sr6Nb2O11 is Pb (Zr_0.50 Ti_0.48) O_3-like structured and crystallizes in the triclinic P1 space group. There are twelve inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(14), one O(19), one O(4), one O(5), and two equivalent O(3) atoms. In the second Sr site, Sr(2) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(5) atom to form distorted SrO5 square pyramids that share corners with three equivalent Nb(2)O6 octahedra and corners with two equivalent Nb(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 10-45°. In the third Sr site, Sr(3) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the fourth Sr site, Sr(4) is bonded in a 6-coordinate geometry to one O(10), one O(15), one O(6), one O(7), one O(8), and one O(9) atom. In the fifth Sr site, Sr(5) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(8), and one O(9) atom. In the sixth Sr site, Sr(6) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(12), one O(13), one O(15), and one O(16) atom. In the seventh Sr site, Sr(7) is bonded to one O(11), one O(12), one O(13), one O(15), one O(16), and one O(17) atom to form distorted SrO6 octahedra that share corners with three equivalent Nb(4)O6 octahedra and corners with three equivalent Nb(3)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 10-30°. In the eighth Sr site, Sr(8) is bonded in a 4-coordinate geometry to one O(16), one O(17), one O(18), one O(21), one O(22), and two equivalent O(20) atoms. In the ninth Sr site, Sr(9) is bonded in a 6-coordinate geometry to one O(10), one O(13), one O(15), one O(7), one O(8), and one O(9) atom. In the tenth Sr site, Sr(10) is bonded in a 6-coordinate geometry to one O(14), one O(18), one O(19), one O(20), one O(21), and one O(22) atom. In the eleventh Sr site, Sr(11) is bonded in a 7-coordinate geometry to one O(11), one O(12), one O(16), one O(17), one O(18), one O(20), and one O(21) atom. In the twelfth Sr site, Sr(12) is bonded in a 6-coordinate geometry to one O(14), one O(19), one O(20), one O(21), one O(22), and one O(3) atom. There are four inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(14), one O(19), one O(22), one O(3), and one O(4) atom to form distorted NbO5 trigonal bipyramids that share corners with two equivalent Sr(2)O5 square pyramids. In the second Nb site, Nb(2) is bonded to one O(1), one O(2), one O(5), one O(6), one O(8), and one O(9) atom to form NbO6 octahedra that share corners with three equivalent Sr(2)O5 square pyramids. In the third Nb site, Nb(3) is bonded to one O(10), one O(11), one O(13), one O(15), and one O(7) atom to form distorted NbO5 trigonal bipyramids that share corners with three equivalent Sr(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-60°. In the fourth Nb site, Nb(4) is bonded to one O(12), one O(16), one O(17), one O(18), one O(20), and one O(21) atom to form distorted NbO6 octahedra that share corners with three equivalent Sr(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-30°. There are twenty-two inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(5), and one Nb(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(3), one Sr(5), and one Nb(2) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Sr(12), one Sr(2), two equivalent Sr(1), and one Nb(1) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Sr(1), one Sr(2), one Sr(5), and one Nb(1) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(5), and one Nb(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(4), one Sr(5), and one Nb(2) atom. In the seventh O site, O(7) is bonded in a distorted see-saw-like geometry to one Sr(3), one Sr(4), one Sr(9), and one Nb(3) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Sr(3), one Sr(4), one Sr(5), one Sr(9), and one Nb(2) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Sr(3), one Sr(4), one Sr(5), one Sr(9), and one Nb(2) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Sr(4), one Sr(6), one Sr(9), and one Nb(3) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(11), one Sr(6), one Sr(7), and one Nb(3) atom. In the twelfth O site, O(12) is bonded in a 2-coordinate geometry to one Sr(11), one Sr(6), one Sr(7), and one Nb(4) atom. In the thirteenth O site, O(13) is bonded in a distorted see-saw-like geometry to one Sr(6), one Sr(7), one Sr(9), and one Nb(3) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal pyramidal geometry to one Sr(1), one Sr(10), one Sr(12), and one Nb(1) atom. In the fifteenth O site, O(15) is bonded in a 5-coordinate geometry to one Sr(4), one Sr(6), one Sr(7), one Sr(9), and one Nb(3) atom. In the sixteenth O site, O(16) is bonded in a 5-coordinate geometry to one Sr(11), one Sr(6), one Sr(7), one Sr(8), and one Nb(4) atom. In the seventeenth O site, O(17) is bonded in a distorted rectangular see-saw-like geometry to one Sr(11), one Sr(7), one Sr(8), and one Nb(4) atom. In the eighteenth O site, O(18) is bonded in a 2-coordinate geometry to one Sr(10), one Sr(11), one Sr(8), and one Nb(4) atom. In the nineteenth O site, O(19) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(10), one Sr(12), and one Nb(1) atom. In the twentieth O site, O(20) is bonded in a 6-coordinate geometry to one Sr(10), one Sr(11), one Sr(12), two equivalent Sr(8), and one Nb(4) atom. In the twenty-first O site, O(21) is bonded in a 4-coordinate geometry to one Sr(10), one Sr(11), one Sr(12), one Sr(8), and one Nb(4) atom. In the twenty-second O site, O(22) is bonded in a distorted rectangular see-saw-like geometry to one Sr(10), one Sr(12), one Sr(8), and one Nb(1) atom. is represented by the CIF card [CIF]
data_Sr6Nb2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.997
_cell_length_b   6.019
_cell_length_c   19.837
_cell_angle_alpha   97.348
_cell_angle_beta   90.398
_cell_angle_gamma   119.663
_symmetry_Int_Tables_number   1
_cell_volume   615.069
_cell_formula_units_Z   2
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  0.299  0.598  0.930  1.0
  Sr  Sr1  1  0.695  0.309  0.883  1.0
  Sr  Sr2  1  0.821  0.440  0.703  1.0
  Sr  Sr3  1  0.159  0.123  0.623  1.0
  Sr  Sr4  1  0.039  0.997  0.802  1.0
  Sr  Sr5  1  0.363  0.204  0.425  1.0
  Sr  Sr6  1  0.717  0.871  0.384  1.0
  Sr  Sr7  1  0.826  0.924  0.201  1.0
  Sr  Sr8  1  0.503  0.797  0.575  1.0
  Sr  Sr9  1  0.210  0.617  0.117  1.0
  Sr  Sr10  1  0.053  0.539  0.296  1.0
  Sr  Sr11  1  0.543  0.303  0.077  1.0
  Nb  Nb12  1  0.980  0.948  0.003  1.0
  Nb  Nb13  1  0.431  0.719  0.752  1.0
  Nb  Nb14  1  0.929  0.497  0.500  1.0
  Nb  Nb15  1  0.445  0.216  0.251  1.0
  O  O16  1  0.580  0.569  0.815  1.0
  O  O17  1  0.651  0.059  0.787  1.0
  O  O18  1  0.825  0.596  0.972  1.0
  O  O19  1  0.960  0.112  0.921  1.0
  O  O20  1  0.132  0.639  0.829  1.0
  O  O21  1  0.228  0.377  0.717  1.0
  O  O22  1  0.022  0.433  0.586  1.0
  O  O23  1  0.723  0.795  0.671  1.0
  O  O24  1  0.277  0.868  0.692  1.0
  O  O25  1  0.552  0.236  0.540  1.0
  O  O26  1  0.839  0.320  0.418  1.0
  O  O27  1  0.596  0.518  0.307  1.0
  O  O28  1  0.303  0.615  0.462  1.0
  O  O29  1  0.304  0.938  0.004  1.0
  O  O30  1  0.920  0.813  0.496  1.0
  O  O31  1  0.152  0.002  0.330  1.0
  O  O32  1  0.644  0.072  0.293  1.0
  O  O33  1  0.249  0.912  0.197  1.0
  O  O34  1  0.166  0.298  0.037  1.0
  O  O35  1  0.758  0.365  0.175  1.0
  O  O36  1  0.271  0.375  0.204  1.0
  O  O37  1  0.710  0.812  0.083  1.0
[/CIF]
.