The material 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 3-coordinate geometry to one O(14), one O(22), one O(4), and one O(5) atom. In the second Sr site, Sr(2) is bonded in a 2-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(5) atom. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), 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 1-coordinate geometry to one O(10), one O(15), one O(6), one O(7), and one O(8) 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 4-coordinate geometry to one O(10), one O(11), one O(13), and one O(16) atom. In the seventh Sr site, Sr(7) is bonded in a 6-coordinate geometry to one O(11), one O(12), one O(13), one O(15), one O(16), and one O(17) atom. In the eighth Sr site, Sr(8) is bonded in a 7-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 2-coordinate geometry to one O(10), one O(13), one O(7), and one O(8) atom. In the tenth Sr site, Sr(10) is bonded in a 2-coordinate geometry to 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 5-coordinate geometry to one O(12), one O(16), one O(17), one O(20), and one O(21) atom. In the twelfth Sr site, Sr(12) is bonded in a 4-coordinate geometry to one O(14), one O(19), one O(20), and one O(22) atom. There are four inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 5-coordinate geometry to one O(14), one O(19), one O(22), one O(3), and one O(4) atom. In the second Nb site, Nb(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(5), one O(6), one O(8), and one O(9) atom. In the third Nb site, Nb(3) is bonded in a 5-coordinate geometry to one O(10), one O(11), one O(13), one O(15), and one O(7) atom. In the fourth Nb site, Nb(4) is bonded in a 4-coordinate geometry to one O(12), one O(16), one O(17), one O(18), one O(20), and one O(21) atom. There are twenty-two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to 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 3-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 2-coordinate geometry to one Sr(2) and one Nb(1) atom. In the fourth O site, O(4) is bonded in a distorted 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 2-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 4-coordinate 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 1-coordinate geometry to one Sr(3), one Sr(5), and one Nb(2) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Sr(3), 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 3-coordinate geometry to 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(7), and one Nb(4) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate 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 planar geometry to one Sr(1), one Sr(12), and one Nb(1) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Sr(4), one Sr(7), 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 4-coordinate 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 3-coordinate geometry to one Sr(10), one Sr(8), and one Nb(4) atom. In the nineteenth O site, O(19) is bonded in a 3-coordinate geometry to 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(8), and one Nb(4) atom. In the twenty-second O site, O(22) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(10), one Sr(12), one Sr(8), and one Nb(1) atom. is represented by the CIF file [CIF]
data_Sr6Nb2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.992
_cell_length_b   6.020
_cell_length_c   19.863
_cell_angle_alpha   97.602
_cell_angle_beta   90.273
_cell_angle_gamma   119.386
_symmetry_Int_Tables_number   1
_cell_volume   616.849
_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  0.371  0.671  0.932  1.0
  Sr  Sr1  1  0.831  0.443  0.880  1.0
  Sr  Sr2  1  0.121  0.746  0.702  1.0
  Sr  Sr3  1  0.535  0.503  0.626  1.0
  Sr  Sr4  1  0.242  0.199  0.803  1.0
  Sr  Sr5  1  0.930  0.772  0.427  1.0
  Sr  Sr6  1  0.332  0.480  0.382  1.0
  Sr  Sr7  1  0.625  0.723  0.201  1.0
  Sr  Sr8  1  0.931  0.226  0.573  1.0
  Sr  Sr9  1  0.085  0.494  0.119  1.0
  Sr  Sr10  1  0.754  0.231  0.298  1.0
  Sr  Sr11  1  0.467  0.231  0.076  1.0
  Nb  Nb12  1  0.973  0.946  0.003  1.0
  Nb  Nb13  1  0.687  0.975  0.751  1.0
  Nb  Nb14  1  0.426  0.992  0.500  1.0
  Nb  Nb15  1  0.193  0.959  0.251  1.0
  O  O16  1  0.787  0.768  0.812  1.0
  O  O17  1  0.877  0.283  0.785  1.0
  O  O18  1  0.845  0.631  0.971  1.0
  O  O19  1  0.040  0.198  0.921  1.0
  O  O20  1  0.319  0.820  0.830  1.0
  O  O21  1  0.511  0.662  0.719  1.0
  O  O22  1  0.445  0.854  0.585  1.0
  O  O23  1  0.051  0.130  0.669  1.0
  O  O24  1  0.579  0.175  0.694  1.0
  O  O25  1  0.006  0.693  0.543  1.0
  O  O26  1  0.406  0.884  0.421  1.0
  O  O27  1  0.295  0.211  0.305  1.0
  O  O28  1  0.837  0.148  0.460  1.0
  O  O29  1  0.288  0.927  0.006  1.0
  O  O30  1  0.421  0.311  0.494  1.0
  O  O31  1  0.822  0.676  0.331  1.0
  O  O32  1  0.355  0.779  0.293  1.0
  O  O33  1  0.039  0.698  0.201  1.0
  O  O34  1  0.124  0.262  0.037  1.0
  O  O35  1  0.577  0.177  0.173  1.0
  O  O36  1  0.066  0.164  0.204  1.0
  O  O37  1  0.624  0.728  0.082  1.0
[/CIF]
.
The material 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 3-coordinate geometry to one O(14), one O(22), one O(4), and one O(5) atom. In the second Sr site, Sr(2) is bonded in a 2-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(5) atom. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), 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 1-coordinate geometry to one O(10), one O(15), one O(6), one O(7), and one O(8) 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 4-coordinate geometry to one O(10), one O(11), one O(13), and one O(16) atom. In the seventh Sr site, Sr(7) is bonded in a 6-coordinate geometry to one O(11), one O(12), one O(13), one O(15), one O(16), and one O(17) atom. In the eighth Sr site, Sr(8) is bonded in a 7-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 2-coordinate geometry to one O(10), one O(13), one O(7), and one O(8) atom. In the tenth Sr site, Sr(10) is bonded in a 2-coordinate geometry to 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 5-coordinate geometry to one O(12), one O(16), one O(17), one O(20), and one O(21) atom. In the twelfth Sr site, Sr(12) is bonded in a 4-coordinate geometry to one O(14), one O(19), one O(20), and one O(22) atom. There are four inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 5-coordinate geometry to one O(14), one O(19), one O(22), one O(3), and one O(4) atom. In the second Nb site, Nb(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(5), one O(6), one O(8), and one O(9) atom. In the third Nb site, Nb(3) is bonded in a 5-coordinate geometry to one O(10), one O(11), one O(13), one O(15), and one O(7) atom. In the fourth Nb site, Nb(4) is bonded in a 4-coordinate geometry to one O(12), one O(16), one O(17), one O(18), one O(20), and one O(21) atom. There are twenty-two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to 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 3-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 2-coordinate geometry to one Sr(2) and one Nb(1) atom. In the fourth O site, O(4) is bonded in a distorted 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 2-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 4-coordinate 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 1-coordinate geometry to one Sr(3), one Sr(5), and one Nb(2) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Sr(3), 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 3-coordinate geometry to 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(7), and one Nb(4) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate 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 planar geometry to one Sr(1), one Sr(12), and one Nb(1) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Sr(4), one Sr(7), 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 4-coordinate 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 3-coordinate geometry to one Sr(10), one Sr(8), and one Nb(4) atom. In the nineteenth O site, O(19) is bonded in a 3-coordinate geometry to 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(8), and one Nb(4) atom. In the twenty-second O site, O(22) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(10), one Sr(12), one Sr(8), and one Nb(1) atom. is represented by the CIF file [CIF]
data_Sr6Nb2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.992
_cell_length_b   6.020
_cell_length_c   19.863
_cell_angle_alpha   97.602
_cell_angle_beta   90.273
_cell_angle_gamma   119.386
_symmetry_Int_Tables_number   1
_cell_volume   616.849
_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  0.371  0.671  0.932  1.0
  Sr  Sr1  1  0.831  0.443  0.880  1.0
  Sr  Sr2  1  0.121  0.746  0.702  1.0
  Sr  Sr3  1  0.535  0.503  0.626  1.0
  Sr  Sr4  1  0.242  0.199  0.803  1.0
  Sr  Sr5  1  0.930  0.772  0.427  1.0
  Sr  Sr6  1  0.332  0.480  0.382  1.0
  Sr  Sr7  1  0.625  0.723  0.201  1.0
  Sr  Sr8  1  0.931  0.226  0.573  1.0
  Sr  Sr9  1  0.085  0.494  0.119  1.0
  Sr  Sr10  1  0.754  0.231  0.298  1.0
  Sr  Sr11  1  0.467  0.231  0.076  1.0
  Nb  Nb12  1  0.973  0.946  0.003  1.0
  Nb  Nb13  1  0.687  0.975  0.751  1.0
  Nb  Nb14  1  0.426  0.992  0.500  1.0
  Nb  Nb15  1  0.193  0.959  0.251  1.0
  O  O16  1  0.787  0.768  0.812  1.0
  O  O17  1  0.877  0.283  0.785  1.0
  O  O18  1  0.845  0.631  0.971  1.0
  O  O19  1  0.040  0.198  0.921  1.0
  O  O20  1  0.319  0.820  0.830  1.0
  O  O21  1  0.511  0.662  0.719  1.0
  O  O22  1  0.445  0.854  0.585  1.0
  O  O23  1  0.051  0.130  0.669  1.0
  O  O24  1  0.579  0.175  0.694  1.0
  O  O25  1  0.006  0.693  0.543  1.0
  O  O26  1  0.406  0.884  0.421  1.0
  O  O27  1  0.295  0.211  0.305  1.0
  O  O28  1  0.837  0.148  0.460  1.0
  O  O29  1  0.288  0.927  0.006  1.0
  O  O30  1  0.421  0.311  0.494  1.0
  O  O31  1  0.822  0.676  0.331  1.0
  O  O32  1  0.355  0.779  0.293  1.0
  O  O33  1  0.039  0.698  0.201  1.0
  O  O34  1  0.124  0.262  0.037  1.0
  O  O35  1  0.577  0.177  0.173  1.0
  O  O36  1  0.066  0.164  0.204  1.0
  O  O37  1  0.624  0.728  0.082  1.0
[/CIF]
.