The material structure described by Sr8Co8O23 crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 11-coordinate geometry to one O(4), two equivalent O(3), four equivalent O(1), and four equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded to one O(4), one O(5), two equivalent O(3), four equivalent O(1), and four equivalent O(2) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(2)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, faces with two equivalent Co(2)O6 octahedra, faces with four equivalent Co(1)O6 octahedra, and faces with two equivalent Co(3)O5 square pyramids. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form CoO6 octahedra that share corners with two equivalent Co(1)O6 octahedra; corners with two Co(2,2)O6 octahedra; corners with two equivalent Co(3)O5 square pyramids; and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-15°. In the second Co site, Co(2) is bonded to two equivalent O(4) and four equivalent O(1) atoms to form CoO6 octahedra that share corners with two equivalent Co(2)O6 octahedra, corners with four equivalent Co(1)O6 octahedra, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedra are not tilted. In the third Co site, Co(3) is bonded to one O(5) and four equivalent O(2) atoms to form CoO5 square pyramids that share corners with four equivalent Co(1)O6 octahedra,  a cornercorner with one Co(3)O5 square pyramid, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 12°. In the fourth Co site, Co(2) is bonded to two equivalent O(4) and four equivalent O(1) atoms to form CoO6 octahedra that share corners with two equivalent Co(2)O6 octahedra, corners with four equivalent Co(1)O6 octahedra, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedra are not tilted. There are five inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Co(1), and one Co(2) atom to form a mixture of distorted edge, face, and corner-sharing OSr4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-60°. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Co(1), and one Co(3) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Co(1) atoms. In the fourth O site, O(4) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Co(2) atoms to form a mixture of distorted face and corner-sharing OSr4Co2 octahedra. The corner-sharing octahedra are not tilted. In the fifth O site, O(5) is bonded to four equivalent Sr(2) and two equivalent Co(3) atoms to form corner-sharing OSr4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-60°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr8Co8O23
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.688
_cell_length_b   8.688
_cell_length_c   8.688
_cell_angle_alpha   101.462
_cell_angle_beta   101.462
_cell_angle_gamma   127.054
_symmetry_Int_Tables_number   1
_cell_volume   468.523
_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  0.259  0.000  0.259  1.0
  Sr  Sr1  1  0.745  0.500  0.245  1.0
  Sr  Sr2  1  0.000  0.741  0.741  1.0
  Sr  Sr3  1  0.255  0.500  0.755  1.0
  Sr  Sr4  1  0.500  0.255  0.755  1.0
  Sr  Sr5  1  0.741  0.000  0.741  1.0
  Sr  Sr6  1  0.000  0.259  0.259  1.0
  Sr  Sr7  1  0.500  0.745  0.245  1.0
  Co  Co8  1  0.500  0.000  0.000  1.0
  Co  Co9  1  0.000  0.500  0.000  1.0
  Co  Co10  1  0.250  0.750  0.500  1.0
  Co  Co11  1  0.759  0.759  0.000  1.0
  Co  Co12  1  0.500  0.500  0.500  1.0
  Co  Co13  1  0.241  0.241  0.000  1.0
  Co  Co14  1  0.000  0.000  0.500  1.0
  Co  Co15  1  0.750  0.250  0.500  1.0
  O  O16  1  0.880  0.380  0.760  1.0
  O  O17  1  0.101  0.101  0.767  1.0
  O  O18  1  0.880  0.120  0.500  1.0
  O  O19  1  0.380  0.620  0.500  1.0
  O  O20  1  0.665  0.665  0.767  1.0
  O  O21  1  0.266  0.266  0.533  1.0
  O  O22  1  0.266  0.734  0.000  1.0
  O  O23  1  0.000  0.500  0.500  1.0
  O  O24  1  0.665  0.899  0.000  1.0
  O  O25  1  0.620  0.380  0.500  1.0
  O  O26  1  0.380  0.880  0.760  1.0
  O  O27  1  0.620  0.120  0.240  1.0
  O  O28  1  0.899  0.899  0.233  1.0
  O  O29  1  0.500  0.000  0.500  1.0
  O  O30  1  0.120  0.880  0.500  1.0
  O  O31  1  0.335  0.335  0.233  1.0
  O  O32  1  0.335  0.101  0.000  1.0
  O  O33  1  0.899  0.665  0.000  1.0
  O  O34  1  0.120  0.620  0.240  1.0
  O  O35  1  0.734  0.266  0.000  1.0
  O  O36  1  0.734  0.734  0.467  1.0
  O  O37  1  0.500  0.500  0.000  1.0
  O  O38  1  0.101  0.335  0.000  1.0
[/CIF]
.
The material structure described by Sr8Co8O23 crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 11-coordinate geometry to one O(4), two equivalent O(3), four equivalent O(1), and four equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded to one O(4), one O(5), two equivalent O(3), four equivalent O(1), and four equivalent O(2) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(2)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, faces with two equivalent Co(2)O6 octahedra, faces with four equivalent Co(1)O6 octahedra, and faces with two equivalent Co(3)O5 square pyramids. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form CoO6 octahedra that share corners with two equivalent Co(1)O6 octahedra; corners with two Co(2,2)O6 octahedra; corners with two equivalent Co(3)O5 square pyramids; and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-15°. In the second Co site, Co(2) is bonded to two equivalent O(4) and four equivalent O(1) atoms to form CoO6 octahedra that share corners with two equivalent Co(2)O6 octahedra, corners with four equivalent Co(1)O6 octahedra, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedra are not tilted. In the third Co site, Co(3) is bonded to one O(5) and four equivalent O(2) atoms to form CoO5 square pyramids that share corners with four equivalent Co(1)O6 octahedra,  a cornercorner with one Co(3)O5 square pyramid, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 12°. In the fourth Co site, Co(2) is bonded to two equivalent O(4) and four equivalent O(1) atoms to form CoO6 octahedra that share corners with two equivalent Co(2)O6 octahedra, corners with four equivalent Co(1)O6 octahedra, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedra are not tilted. There are five inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Co(1), and one Co(2) atom to form a mixture of distorted edge, face, and corner-sharing OSr4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-60°. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Co(1), and one Co(3) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Co(1) atoms. In the fourth O site, O(4) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Co(2) atoms to form a mixture of distorted face and corner-sharing OSr4Co2 octahedra. The corner-sharing octahedra are not tilted. In the fifth O site, O(5) is bonded to four equivalent Sr(2) and two equivalent Co(3) atoms to form corner-sharing OSr4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-60°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr8Co8O23
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.688
_cell_length_b   8.688
_cell_length_c   8.688
_cell_angle_alpha   101.462
_cell_angle_beta   101.462
_cell_angle_gamma   127.054
_symmetry_Int_Tables_number   1
_cell_volume   468.523
_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  0.259  0.000  0.259  1.0
  Sr  Sr1  1  0.745  0.500  0.245  1.0
  Sr  Sr2  1  0.000  0.741  0.741  1.0
  Sr  Sr3  1  0.255  0.500  0.755  1.0
  Sr  Sr4  1  0.500  0.255  0.755  1.0
  Sr  Sr5  1  0.741  0.000  0.741  1.0
  Sr  Sr6  1  0.000  0.259  0.259  1.0
  Sr  Sr7  1  0.500  0.745  0.245  1.0
  Co  Co8  1  0.500  0.000  0.000  1.0
  Co  Co9  1  0.000  0.500  0.000  1.0
  Co  Co10  1  0.250  0.750  0.500  1.0
  Co  Co11  1  0.759  0.759  0.000  1.0
  Co  Co12  1  0.500  0.500  0.500  1.0
  Co  Co13  1  0.241  0.241  0.000  1.0
  Co  Co14  1  0.000  0.000  0.500  1.0
  Co  Co15  1  0.750  0.250  0.500  1.0
  O  O16  1  0.880  0.380  0.760  1.0
  O  O17  1  0.101  0.101  0.767  1.0
  O  O18  1  0.880  0.120  0.500  1.0
  O  O19  1  0.380  0.620  0.500  1.0
  O  O20  1  0.665  0.665  0.767  1.0
  O  O21  1  0.266  0.266  0.533  1.0
  O  O22  1  0.266  0.734  0.000  1.0
  O  O23  1  0.000  0.500  0.500  1.0
  O  O24  1  0.665  0.899  0.000  1.0
  O  O25  1  0.620  0.380  0.500  1.0
  O  O26  1  0.380  0.880  0.760  1.0
  O  O27  1  0.620  0.120  0.240  1.0
  O  O28  1  0.899  0.899  0.233  1.0
  O  O29  1  0.500  0.000  0.500  1.0
  O  O30  1  0.120  0.880  0.500  1.0
  O  O31  1  0.335  0.335  0.233  1.0
  O  O32  1  0.335  0.101  0.000  1.0
  O  O33  1  0.899  0.665  0.000  1.0
  O  O34  1  0.120  0.620  0.240  1.0
  O  O35  1  0.734  0.266  0.000  1.0
  O  O36  1  0.734  0.734  0.467  1.0
  O  O37  1  0.500  0.500  0.000  1.0
  O  O38  1  0.101  0.335  0.000  1.0
[/CIF]
.