The structure described by Sr6Bi2O11 crystallizes in the tetragonal P4/nmm space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. In the second Sr site, Sr(2) is bonded in a distorted hexagonal planar geometry to two equivalent O(3) and four equivalent O(2) atoms. In the third Sr site, Sr(3) is bonded to one O(4) and four equivalent O(1) atoms to form distorted SrO5 trigonal bipyramids that share corners with four equivalent Bi(1)O6 octahedra and  a cornercorner with one Bi(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 23°. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form BiO6 octahedra that share corners with four equivalent Sr(3)O5 trigonal bipyramids. In the second Bi site, Bi(2) is bonded to one O(4) and four equivalent O(2) atoms to form distorted BiO5 trigonal bipyramids that share  a cornercorner with one Sr(3)O5 trigonal bipyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Sr(3), four equivalent Sr(1), and one Bi(1) atom. In the second O site, O(2) is bonded to one Sr(2), two equivalent Sr(1), and one Bi(2) atom to form a mixture of corner and edge-sharing OSr3Bi tetrahedra. In the third O site, O(3) is bonded in a distorted linear geometry to one Sr(2), four equivalent Sr(1), and one Bi(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Sr(3) and one Bi(2) atom. is represented by the CIF card [CIF]
data_Sr6Bi2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.745
_cell_length_b   8.745
_cell_length_c   9.130
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   698.137
_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  0.277  0.777  0.792  1.0
  Sr  Sr1  1  0.277  0.223  0.792  1.0
  Sr  Sr2  1  0.223  0.277  0.208  1.0
  Sr  Sr3  1  0.223  0.723  0.208  1.0
  Sr  Sr4  1  0.500  0.500  0.500  1.0
  Sr  Sr5  1  0.723  0.223  0.792  1.0
  Sr  Sr6  1  0.500  0.000  0.069  1.0
  Sr  Sr7  1  0.723  0.777  0.792  1.0
  Sr  Sr8  1  0.777  0.723  0.208  1.0
  Sr  Sr9  1  0.777  0.277  0.208  1.0
  Sr  Sr10  1  0.000  0.000  0.500  1.0
  Sr  Sr11  1  0.000  0.500  0.931  1.0
  Bi  Bi12  1  0.000  0.000  0.000  1.0
  Bi  Bi13  1  0.500  0.000  0.541  1.0
  Bi  Bi14  1  0.500  0.500  0.000  1.0
  Bi  Bi15  1  0.000  0.500  0.459  1.0
  O  O16  1  0.254  0.500  0.016  1.0
  O  O17  1  0.500  0.746  0.984  1.0
  O  O18  1  0.270  0.000  0.614  1.0
  O  O19  1  0.230  0.500  0.386  1.0
  O  O20  1  0.500  0.230  0.614  1.0
  O  O21  1  0.000  0.754  0.016  1.0
  O  O22  1  0.754  0.000  0.984  1.0
  O  O23  1  0.500  0.500  0.229  1.0
  O  O24  1  0.500  0.500  0.771  1.0
  O  O25  1  0.246  0.000  0.984  1.0
  O  O26  1  0.000  0.246  0.016  1.0
  O  O27  1  0.500  0.770  0.614  1.0
  O  O28  1  0.770  0.500  0.386  1.0
  O  O29  1  0.500  0.000  0.317  1.0
  O  O30  1  0.000  0.500  0.683  1.0
  O  O31  1  0.730  0.000  0.614  1.0
  O  O32  1  0.000  0.730  0.386  1.0
  O  O33  1  0.500  0.254  0.984  1.0
  O  O34  1  0.000  0.000  0.229  1.0
  O  O35  1  0.000  0.000  0.771  1.0
  O  O36  1  0.746  0.500  0.016  1.0
  O  O37  1  0.000  0.270  0.386  1.0
[/CIF]
.
The structure described by Sr6Bi2O11 crystallizes in the tetragonal P4/nmm space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. In the second Sr site, Sr(2) is bonded in a distorted hexagonal planar geometry to two equivalent O(3) and four equivalent O(2) atoms. In the third Sr site, Sr(3) is bonded to one O(4) and four equivalent O(1) atoms to form distorted SrO5 trigonal bipyramids that share corners with four equivalent Bi(1)O6 octahedra and  a cornercorner with one Bi(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 23°. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form BiO6 octahedra that share corners with four equivalent Sr(3)O5 trigonal bipyramids. In the second Bi site, Bi(2) is bonded to one O(4) and four equivalent O(2) atoms to form distorted BiO5 trigonal bipyramids that share  a cornercorner with one Sr(3)O5 trigonal bipyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Sr(3), four equivalent Sr(1), and one Bi(1) atom. In the second O site, O(2) is bonded to one Sr(2), two equivalent Sr(1), and one Bi(2) atom to form a mixture of corner and edge-sharing OSr3Bi tetrahedra. In the third O site, O(3) is bonded in a distorted linear geometry to one Sr(2), four equivalent Sr(1), and one Bi(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Sr(3) and one Bi(2) atom. is represented by the CIF card [CIF]
data_Sr6Bi2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.745
_cell_length_b   8.745
_cell_length_c   9.130
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   698.137
_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  0.277  0.777  0.792  1.0
  Sr  Sr1  1  0.277  0.223  0.792  1.0
  Sr  Sr2  1  0.223  0.277  0.208  1.0
  Sr  Sr3  1  0.223  0.723  0.208  1.0
  Sr  Sr4  1  0.500  0.500  0.500  1.0
  Sr  Sr5  1  0.723  0.223  0.792  1.0
  Sr  Sr6  1  0.500  0.000  0.069  1.0
  Sr  Sr7  1  0.723  0.777  0.792  1.0
  Sr  Sr8  1  0.777  0.723  0.208  1.0
  Sr  Sr9  1  0.777  0.277  0.208  1.0
  Sr  Sr10  1  0.000  0.000  0.500  1.0
  Sr  Sr11  1  0.000  0.500  0.931  1.0
  Bi  Bi12  1  0.000  0.000  0.000  1.0
  Bi  Bi13  1  0.500  0.000  0.541  1.0
  Bi  Bi14  1  0.500  0.500  0.000  1.0
  Bi  Bi15  1  0.000  0.500  0.459  1.0
  O  O16  1  0.254  0.500  0.016  1.0
  O  O17  1  0.500  0.746  0.984  1.0
  O  O18  1  0.270  0.000  0.614  1.0
  O  O19  1  0.230  0.500  0.386  1.0
  O  O20  1  0.500  0.230  0.614  1.0
  O  O21  1  0.000  0.754  0.016  1.0
  O  O22  1  0.754  0.000  0.984  1.0
  O  O23  1  0.500  0.500  0.229  1.0
  O  O24  1  0.500  0.500  0.771  1.0
  O  O25  1  0.246  0.000  0.984  1.0
  O  O26  1  0.000  0.246  0.016  1.0
  O  O27  1  0.500  0.770  0.614  1.0
  O  O28  1  0.770  0.500  0.386  1.0
  O  O29  1  0.500  0.000  0.317  1.0
  O  O30  1  0.000  0.500  0.683  1.0
  O  O31  1  0.730  0.000  0.614  1.0
  O  O32  1  0.000  0.730  0.386  1.0
  O  O33  1  0.500  0.254  0.984  1.0
  O  O34  1  0.000  0.000  0.229  1.0
  O  O35  1  0.000  0.000  0.771  1.0
  O  O36  1  0.746  0.500  0.016  1.0
  O  O37  1  0.000  0.270  0.386  1.0
[/CIF]
.