The structure described by Sr3Co3O8 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 distorted q6 geometry to two equivalent O(1), two equivalent O(4), two equivalent O(5), and four equivalent O(3) atoms. In the second Sr site, Sr(2) is bonded in a 11-coordinate geometry to one O(4), one O(5), one O(6), two equivalent O(2), two equivalent O(3), two equivalent O(7), and two equivalent O(8) atoms. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(4), one O(5), one O(7), and two equivalent O(3) atoms to form CoO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra, corners with four equivalent Co(3)O5 square pyramids, and  a cornercorner with one Co(2)O5 trigonal bipyramid. The corner-sharing octahedra are not tilted. In the second Co site, Co(2) is bonded to one O(6), one O(7), one O(8), and two equivalent O(2) atoms to form CoO5 trigonal bipyramids that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O5 square pyramid, and corners with three equivalent Co(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 16°. In the third Co site, Co(3) is bonded to one O(4), one O(5), one O(8), and two equivalent O(3) atoms to form CoO5 square pyramids that share corners with four equivalent Co(1)O6 octahedra and  a cornercorner with one Co(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 4-17°. There are eight inequivalent O sites. In the first O site, O(7) is bonded in a 2-coordinate geometry to four equivalent Sr(2), one Co(1), and one Co(2) atom. In the second O site, O(8) is bonded in a 4-coordinate geometry to four equivalent Sr(2), one Co(2), and one Co(3) atom. In the third O site, O(1) is bonded in a distorted linear geometry to four equivalent Sr(1) and two equivalent Co(1) atoms. In the fourth O site, O(2) is bonded to four equivalent Sr(2) and two equivalent Co(2) atoms to form a mixture of distorted corner, edge, and face-sharing OSr4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-62°. In the fifth O site, O(3) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Co(1), and one Co(3) atom to form a mixture of distorted corner, edge, and face-sharing OSr4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-65°. In the sixth O site, O(4) 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 seventh O site, O(5) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Co(1), and one Co(3) atom to form a mixture of distorted corner, edge, and face-sharing OSr4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-65°. In the eighth O site, O(6) is bonded to four equivalent Sr(2) and two equivalent Co(2) atoms to form a mixture of distorted corner, edge, and face-sharing OSr4Co2 octahedra. The corner-sharing octahedral tilt angles range from 57-62°. is represented by the CIF file [CIF]
data_Sr3Co3O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.604
_cell_length_b   5.604
_cell_length_c   11.967
_cell_angle_alpha   76.970
_cell_angle_beta   76.970
_cell_angle_gamma   89.839
_symmetry_Int_Tables_number   1
_cell_volume   356.200
_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  0.500  0.000  0.000  1.0
  Sr  Sr1  1  0.000  0.500  0.000  1.0
  Sr  Sr2  1  0.829  0.342  0.328  1.0
  Sr  Sr3  1  0.658  0.171  0.672  1.0
  Sr  Sr4  1  0.171  0.658  0.672  1.0
  Sr  Sr5  1  0.342  0.829  0.328  1.0
  Co  Co6  1  0.587  0.587  0.837  1.0
  Co  Co7  1  0.413  0.413  0.163  1.0
  Co  Co8  1  0.263  0.263  0.496  1.0
  Co  Co9  1  0.086  0.086  0.821  1.0
  Co  Co10  1  0.914  0.914  0.179  1.0
  Co  Co11  1  0.737  0.737  0.504  1.0
  O  O12  1  0.500  0.500  0.000  1.0
  O  O13  1  0.000  0.500  0.500  1.0
  O  O14  1  0.144  0.692  0.157  1.0
  O  O15  1  0.166  0.166  0.145  1.0
  O  O16  1  0.664  0.664  0.177  1.0
  O  O17  1  0.500  0.500  0.500  1.0
  O  O18  1  0.308  0.856  0.843  1.0
  O  O19  1  0.692  0.144  0.157  1.0
  O  O20  1  0.500  0.000  0.500  1.0
  O  O21  1  0.303  0.303  0.335  1.0
  O  O22  1  0.880  0.880  0.351  1.0
  O  O23  1  0.120  0.120  0.649  1.0
  O  O24  1  0.697  0.697  0.665  1.0
  O  O25  1  0.834  0.834  0.855  1.0
  O  O26  1  0.336  0.336  0.823  1.0
  O  O27  1  0.856  0.308  0.843  1.0
[/CIF]
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The structure described by Sr3Co3O8 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 distorted q6 geometry to two equivalent O(1), two equivalent O(4), two equivalent O(5), and four equivalent O(3) atoms. In the second Sr site, Sr(2) is bonded in a 11-coordinate geometry to one O(4), one O(5), one O(6), two equivalent O(2), two equivalent O(3), two equivalent O(7), and two equivalent O(8) atoms. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(4), one O(5), one O(7), and two equivalent O(3) atoms to form CoO6 octahedra that share  a cornercorner with one Co(1)O6 octahedra, corners with four equivalent Co(3)O5 square pyramids, and  a cornercorner with one Co(2)O5 trigonal bipyramid. The corner-sharing octahedra are not tilted. In the second Co site, Co(2) is bonded to one O(6), one O(7), one O(8), and two equivalent O(2) atoms to form CoO5 trigonal bipyramids that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O5 square pyramid, and corners with three equivalent Co(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 16°. In the third Co site, Co(3) is bonded to one O(4), one O(5), one O(8), and two equivalent O(3) atoms to form CoO5 square pyramids that share corners with four equivalent Co(1)O6 octahedra and  a cornercorner with one Co(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 4-17°. There are eight inequivalent O sites. In the first O site, O(7) is bonded in a 2-coordinate geometry to four equivalent Sr(2), one Co(1), and one Co(2) atom. In the second O site, O(8) is bonded in a 4-coordinate geometry to four equivalent Sr(2), one Co(2), and one Co(3) atom. In the third O site, O(1) is bonded in a distorted linear geometry to four equivalent Sr(1) and two equivalent Co(1) atoms. In the fourth O site, O(2) is bonded to four equivalent Sr(2) and two equivalent Co(2) atoms to form a mixture of distorted corner, edge, and face-sharing OSr4Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-62°. In the fifth O site, O(3) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Co(1), and one Co(3) atom to form a mixture of distorted corner, edge, and face-sharing OSr4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-65°. In the sixth O site, O(4) 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 seventh O site, O(5) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Co(1), and one Co(3) atom to form a mixture of distorted corner, edge, and face-sharing OSr4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-65°. In the eighth O site, O(6) is bonded to four equivalent Sr(2) and two equivalent Co(2) atoms to form a mixture of distorted corner, edge, and face-sharing OSr4Co2 octahedra. The corner-sharing octahedral tilt angles range from 57-62°. is represented by the CIF file [CIF]
data_Sr3Co3O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.604
_cell_length_b   5.604
_cell_length_c   11.967
_cell_angle_alpha   76.970
_cell_angle_beta   76.970
_cell_angle_gamma   89.839
_symmetry_Int_Tables_number   1
_cell_volume   356.200
_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  0.500  0.000  0.000  1.0
  Sr  Sr1  1  0.000  0.500  0.000  1.0
  Sr  Sr2  1  0.829  0.342  0.328  1.0
  Sr  Sr3  1  0.658  0.171  0.672  1.0
  Sr  Sr4  1  0.171  0.658  0.672  1.0
  Sr  Sr5  1  0.342  0.829  0.328  1.0
  Co  Co6  1  0.587  0.587  0.837  1.0
  Co  Co7  1  0.413  0.413  0.163  1.0
  Co  Co8  1  0.263  0.263  0.496  1.0
  Co  Co9  1  0.086  0.086  0.821  1.0
  Co  Co10  1  0.914  0.914  0.179  1.0
  Co  Co11  1  0.737  0.737  0.504  1.0
  O  O12  1  0.500  0.500  0.000  1.0
  O  O13  1  0.000  0.500  0.500  1.0
  O  O14  1  0.144  0.692  0.157  1.0
  O  O15  1  0.166  0.166  0.145  1.0
  O  O16  1  0.664  0.664  0.177  1.0
  O  O17  1  0.500  0.500  0.500  1.0
  O  O18  1  0.308  0.856  0.843  1.0
  O  O19  1  0.692  0.144  0.157  1.0
  O  O20  1  0.500  0.000  0.500  1.0
  O  O21  1  0.303  0.303  0.335  1.0
  O  O22  1  0.880  0.880  0.351  1.0
  O  O23  1  0.120  0.120  0.649  1.0
  O  O24  1  0.697  0.697  0.665  1.0
  O  O25  1  0.834  0.834  0.855  1.0
  O  O26  1  0.336  0.336  0.823  1.0
  O  O27  1  0.856  0.308  0.843  1.0
[/CIF]
.