The material structure described by Sr3Co2O9 crystallizes in the monoclinic C2/m space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(1), two equivalent O(4), and four equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded to four equivalent O(1), four equivalent O(4), and four equivalent O(5) atoms to form a mixture of corner and face-sharing SrO12 cuboctahedra. Co(1) is bonded in a 5-coordinate geometry to one O(2), one O(5), two equivalent O(1), and two equivalent O(4) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Co(1) atoms. In the second O site, O(2) is bonded to four equivalent Sr(1), one Co(1), and one O(3) atom to form distorted OSr4CoO octahedra that share  a cornercorner with one O(5)Sr4Co2 octahedra, corners with four equivalent O(2)Sr4CoO octahedra, and edges with four equivalent O(2)Sr4CoO octahedra. The corner-sharing octahedral tilt angles range from 1-24°. In the third O site, O(3) is bonded in a linear geometry to one Sr(1) and one O(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Co(1) atoms. In the fifth O site, O(5) is bonded to four equivalent Sr(2) and two equivalent Co(1) atoms to form distorted OSr4Co2 octahedra that share corners with two equivalent O(2)Sr4CoO octahedra, corners with four equivalent O(5)Sr4Co2 octahedra, and edges with four equivalent O(5)Sr4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. is represented by the CIF file [CIF]
data_Sr3Co2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.678
_cell_length_b   12.678
_cell_length_c   3.779
_cell_angle_alpha   81.825
_cell_angle_beta   81.825
_cell_angle_gamma   17.803
_symmetry_Int_Tables_number   1
_cell_volume   183.767
_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  0.658  0.658  0.342  1.0
  Sr  Sr1  1  0.342  0.342  0.658  1.0
  Sr  Sr2  1  0.500  0.500  0.500  1.0
  Co  Co3  1  0.923  0.923  0.084  1.0
  Co  Co4  1  0.077  0.077  0.916  1.0
  O  O5  1  0.589  0.589  0.910  1.0
  O  O6  1  0.411  0.411  0.090  1.0
  O  O7  1  0.818  0.818  0.186  1.0
  O  O8  1  0.182  0.182  0.814  1.0
  O  O9  1  0.764  0.764  0.226  1.0
  O  O10  1  0.236  0.236  0.774  1.0
  O  O11  1  0.912  0.912  0.590  1.0
  O  O12  1  0.088  0.088  0.410  1.0
  O  O13  1  0.000  0.000  0.000  1.0
[/CIF]
.
The material structure described by Sr3Co2O9 crystallizes in the monoclinic C2/m space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(1), two equivalent O(4), and four equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded to four equivalent O(1), four equivalent O(4), and four equivalent O(5) atoms to form a mixture of corner and face-sharing SrO12 cuboctahedra. Co(1) is bonded in a 5-coordinate geometry to one O(2), one O(5), two equivalent O(1), and two equivalent O(4) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Co(1) atoms. In the second O site, O(2) is bonded to four equivalent Sr(1), one Co(1), and one O(3) atom to form distorted OSr4CoO octahedra that share  a cornercorner with one O(5)Sr4Co2 octahedra, corners with four equivalent O(2)Sr4CoO octahedra, and edges with four equivalent O(2)Sr4CoO octahedra. The corner-sharing octahedral tilt angles range from 1-24°. In the third O site, O(3) is bonded in a linear geometry to one Sr(1) and one O(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Co(1) atoms. In the fifth O site, O(5) is bonded to four equivalent Sr(2) and two equivalent Co(1) atoms to form distorted OSr4Co2 octahedra that share corners with two equivalent O(2)Sr4CoO octahedra, corners with four equivalent O(5)Sr4Co2 octahedra, and edges with four equivalent O(5)Sr4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. is represented by the CIF file [CIF]
data_Sr3Co2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.678
_cell_length_b   12.678
_cell_length_c   3.779
_cell_angle_alpha   81.825
_cell_angle_beta   81.825
_cell_angle_gamma   17.803
_symmetry_Int_Tables_number   1
_cell_volume   183.767
_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  0.658  0.658  0.342  1.0
  Sr  Sr1  1  0.342  0.342  0.658  1.0
  Sr  Sr2  1  0.500  0.500  0.500  1.0
  Co  Co3  1  0.923  0.923  0.084  1.0
  Co  Co4  1  0.077  0.077  0.916  1.0
  O  O5  1  0.589  0.589  0.910  1.0
  O  O6  1  0.411  0.411  0.090  1.0
  O  O7  1  0.818  0.818  0.186  1.0
  O  O8  1  0.182  0.182  0.814  1.0
  O  O9  1  0.764  0.764  0.226  1.0
  O  O10  1  0.236  0.236  0.774  1.0
  O  O11  1  0.912  0.912  0.590  1.0
  O  O12  1  0.088  0.088  0.410  1.0
  O  O13  1  0.000  0.000  0.000  1.0
[/CIF]
.