The compound described by Sr2Bi2O5 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to two equivalent O(3) and four equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded to one O(1), two equivalent O(2), and four equivalent O(3) atoms to form distorted edge-sharing SrO7 pentagonal bipyramids. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1) and two equivalent O(2) atoms. In the second Bi site, Bi(2) is bonded in a distorted trigonal non-coplanar geometry to one O(1) and two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Sr(2), one Bi(1), and one Bi(2) atom. In the second O site, O(2) is bonded to one Sr(2), two equivalent Sr(1), and one Bi(1) atom to form a mixture of distorted corner and edge-sharing OSr3Bi trigonal pyramids. In the third O site, O(3) is bonded to one Sr(1), two equivalent Sr(2), and one Bi(2) atom to form a mixture of distorted corner and edge-sharing OSr3Bi tetrahedra. is represented by the CIF file [CIF]
data_Sr2Bi2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.406
_cell_length_b   7.677
_cell_length_c   6.208
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   75.409
_symmetry_Int_Tables_number   1
_cell_volume   341.548
_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  0.395  0.899  0.250  1.0
  Sr  Sr1  1  0.605  0.601  0.750  1.0
  Sr  Sr2  1  0.369  0.408  0.250  1.0
  Sr  Sr3  1  0.631  0.092  0.750  1.0
  Bi  Bi4  1  0.887  0.786  0.250  1.0
  Bi  Bi5  1  0.113  0.714  0.750  1.0
  Bi  Bi6  1  0.871  0.274  0.250  1.0
  Bi  Bi7  1  0.129  0.226  0.750  1.0
  O  O8  1  0.010  1.000  0.750  1.0
  O  O9  1  0.688  0.822  0.490  1.0
  O  O10  1  0.688  0.822  0.010  1.0
  O  O11  1  0.990  0.500  0.250  1.0
  O  O12  1  0.312  0.678  0.990  1.0
  O  O13  1  0.312  0.678  0.510  1.0
  O  O14  1  0.674  0.341  0.009  1.0
  O  O15  1  0.674  0.341  0.491  1.0
  O  O16  1  0.326  0.159  0.991  1.0
  O  O17  1  0.326  0.159  0.509  1.0
[/CIF]
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The compound described by Sr2Bi2O5 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to two equivalent O(3) and four equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded to one O(1), two equivalent O(2), and four equivalent O(3) atoms to form distorted edge-sharing SrO7 pentagonal bipyramids. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1) and two equivalent O(2) atoms. In the second Bi site, Bi(2) is bonded in a distorted trigonal non-coplanar geometry to one O(1) and two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Sr(2), one Bi(1), and one Bi(2) atom. In the second O site, O(2) is bonded to one Sr(2), two equivalent Sr(1), and one Bi(1) atom to form a mixture of distorted corner and edge-sharing OSr3Bi trigonal pyramids. In the third O site, O(3) is bonded to one Sr(1), two equivalent Sr(2), and one Bi(2) atom to form a mixture of distorted corner and edge-sharing OSr3Bi tetrahedra. is represented by the CIF file [CIF]
data_Sr2Bi2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.406
_cell_length_b   7.677
_cell_length_c   6.208
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   75.409
_symmetry_Int_Tables_number   1
_cell_volume   341.548
_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  0.395  0.899  0.250  1.0
  Sr  Sr1  1  0.605  0.601  0.750  1.0
  Sr  Sr2  1  0.369  0.408  0.250  1.0
  Sr  Sr3  1  0.631  0.092  0.750  1.0
  Bi  Bi4  1  0.887  0.786  0.250  1.0
  Bi  Bi5  1  0.113  0.714  0.750  1.0
  Bi  Bi6  1  0.871  0.274  0.250  1.0
  Bi  Bi7  1  0.129  0.226  0.750  1.0
  O  O8  1  0.010  1.000  0.750  1.0
  O  O9  1  0.688  0.822  0.490  1.0
  O  O10  1  0.688  0.822  0.010  1.0
  O  O11  1  0.990  0.500  0.250  1.0
  O  O12  1  0.312  0.678  0.990  1.0
  O  O13  1  0.312  0.678  0.510  1.0
  O  O14  1  0.674  0.341  0.009  1.0
  O  O15  1  0.674  0.341  0.491  1.0
  O  O16  1  0.326  0.159  0.991  1.0
  O  O17  1  0.326  0.159  0.509  1.0
[/CIF]
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