The compound described by Sr2Co2O5 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(10), one O(3), one O(5), one O(6), one O(8), two equivalent O(1), and two equivalent O(7) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(10), one O(3), one O(5), one O(6), one O(8), two equivalent O(2), and two equivalent O(4) atoms. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(10), one O(5), one O(6), one O(8), one O(9), two equivalent O(1), and two equivalent O(7) atoms. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(10), one O(5), one O(6), one O(8), one O(9), two equivalent O(2), and two equivalent O(4) atoms. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(3), one O(4), and one O(9) atom to form CoO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra, and corners with two equivalent Co(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 20-21°. In the second Co site, Co(2) is bonded to one O(10), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form CoO6 octahedra that share corners with four equivalent Co(4)O6 octahedra,  a cornercorner with one Co(1)O4 tetrahedra, and  a cornercorner with one Co(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 3°. In the third Co site, Co(3) is bonded to one O(2), one O(3), one O(7), and one O(9) atom to form CoO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra, and corners with two equivalent Co(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 20-21°. In the fourth Co site, Co(4) is bonded to one O(1), one O(10), one O(2), one O(5), one O(6), and one O(8) atom to form CoO6 octahedra that share corners with four equivalent Co(2)O6 octahedra,  a cornercorner with one Co(1)O4 tetrahedra, and  a cornercorner with one Co(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 3°. There are ten 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(3), one Co(1), and one Co(4) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Co(3), and one Co(4) atom. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Co(1), and one Co(3) atom to form distorted OSr2Co2 tetrahedra that share corners with two equivalent O(10)Sr4Co2 octahedra, corners with two equivalent O(5)Sr4Co2 octahedra, corners with two equivalent O(6)Sr4Co2 octahedra, corners with two equivalent O(8)Sr4Co2 octahedra, and corners with two equivalent O(9)Sr2Co2 tetrahedra. The corner-sharing octahedral tilt angles range from 24-69°. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Co(1), and one Co(2) atom. In the fifth O site, O(5) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Co(2), and one Co(4) atom to form distorted OSr4Co2 octahedra that share corners with two equivalent O(10)Sr4Co2 octahedra, corners with two equivalent O(3)Sr2Co2 tetrahedra, corners with two equivalent O(9)Sr2Co2 tetrahedra, edges with two equivalent O(10)Sr4Co2 octahedra, faces with two equivalent O(6)Sr4Co2 octahedra, and faces with two equivalent O(8)Sr4Co2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the sixth O site, O(6) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Co(2), and one Co(4) atom to form distorted OSr4Co2 octahedra that share corners with two equivalent O(8)Sr4Co2 octahedra, corners with two equivalent O(3)Sr2Co2 tetrahedra, corners with two equivalent O(9)Sr2Co2 tetrahedra, edges with two equivalent O(8)Sr4Co2 octahedra, faces with two equivalent O(10)Sr4Co2 octahedra, and faces with two equivalent O(5)Sr4Co2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), one Co(2), and one Co(3) atom. In the eighth O site, O(8) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Co(2), and one Co(4) atom to form distorted OSr4Co2 octahedra that share corners with two equivalent O(6)Sr4Co2 octahedra, corners with two equivalent O(3)Sr2Co2 tetrahedra, corners with two equivalent O(9)Sr2Co2 tetrahedra, edges with two equivalent O(6)Sr4Co2 octahedra, faces with two equivalent O(10)Sr4Co2 octahedra, and faces with two equivalent O(5)Sr4Co2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the ninth O site, O(9) is bonded to one Sr(3), one Sr(4), one Co(1), and one Co(3) atom to form distorted OSr2Co2 tetrahedra that share corners with two equivalent O(10)Sr4Co2 octahedra, corners with two equivalent O(5)Sr4Co2 octahedra, corners with two equivalent O(6)Sr4Co2 octahedra, corners with two equivalent O(8)Sr4Co2 octahedra, and corners with two equivalent O(3)Sr2Co2 tetrahedra. The corner-sharing octahedral tilt angles range from 24-69°. In the tenth O site, O(10) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Co(2), and one Co(4) atom to form distorted OSr4Co2 octahedra that share corners with two equivalent O(5)Sr4Co2 octahedra, corners with two equivalent O(3)Sr2Co2 tetrahedra, corners with two equivalent O(9)Sr2Co2 tetrahedra, edges with two equivalent O(5)Sr4Co2 octahedra, faces with two equivalent O(6)Sr4Co2 octahedra, and faces with two equivalent O(8)Sr4Co2 octahedra. The corner-sharing octahedral tilt angles are 1°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2Co2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.328
_cell_length_b   5.411
_cell_length_c   8.960
_cell_angle_alpha   107.556
_cell_angle_beta   107.309
_cell_angle_gamma   89.963
_symmetry_Int_Tables_number   1
_cell_volume   234.019
_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  0.378  0.881  0.778  1.0
  Sr  Sr1  1  0.101  0.603  0.222  1.0
  Sr  Sr2  1  0.879  0.397  0.778  1.0
  Sr  Sr3  1  0.601  0.119  0.222  1.0
  Co  Co4  1  0.275  0.188  0.500  1.0
  Co  Co5  1  0.988  1.000  0.000  1.0
  Co  Co6  1  0.776  0.812  0.500  1.0
  Co  Co7  1  0.487  0.500  1.000  1.0
  O  O8  1  0.336  0.383  0.714  1.0
  O  O9  1  0.623  0.617  0.286  1.0
  O  O10  1  0.133  0.863  0.500  1.0
  O  O11  1  0.122  0.167  0.285  1.0
  O  O12  1  0.742  0.752  0.006  1.0
  O  O13  1  0.242  0.754  0.006  1.0
  O  O14  1  0.837  0.832  0.715  1.0
  O  O15  1  0.736  0.248  0.994  1.0
  O  O16  1  0.633  0.137  0.500  1.0
  O  O17  1  0.235  0.246  0.994  1.0
[/CIF]
.
The compound described by Sr2Co2O5 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(10), one O(3), one O(5), one O(6), one O(8), two equivalent O(1), and two equivalent O(7) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(10), one O(3), one O(5), one O(6), one O(8), two equivalent O(2), and two equivalent O(4) atoms. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(10), one O(5), one O(6), one O(8), one O(9), two equivalent O(1), and two equivalent O(7) atoms. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(10), one O(5), one O(6), one O(8), one O(9), two equivalent O(2), and two equivalent O(4) atoms. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(3), one O(4), and one O(9) atom to form CoO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra, and corners with two equivalent Co(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 20-21°. In the second Co site, Co(2) is bonded to one O(10), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form CoO6 octahedra that share corners with four equivalent Co(4)O6 octahedra,  a cornercorner with one Co(1)O4 tetrahedra, and  a cornercorner with one Co(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 3°. In the third Co site, Co(3) is bonded to one O(2), one O(3), one O(7), and one O(9) atom to form CoO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra, and corners with two equivalent Co(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 20-21°. In the fourth Co site, Co(4) is bonded to one O(1), one O(10), one O(2), one O(5), one O(6), and one O(8) atom to form CoO6 octahedra that share corners with four equivalent Co(2)O6 octahedra,  a cornercorner with one Co(1)O4 tetrahedra, and  a cornercorner with one Co(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 3°. There are ten 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(3), one Co(1), and one Co(4) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Co(3), and one Co(4) atom. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Co(1), and one Co(3) atom to form distorted OSr2Co2 tetrahedra that share corners with two equivalent O(10)Sr4Co2 octahedra, corners with two equivalent O(5)Sr4Co2 octahedra, corners with two equivalent O(6)Sr4Co2 octahedra, corners with two equivalent O(8)Sr4Co2 octahedra, and corners with two equivalent O(9)Sr2Co2 tetrahedra. The corner-sharing octahedral tilt angles range from 24-69°. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Co(1), and one Co(2) atom. In the fifth O site, O(5) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Co(2), and one Co(4) atom to form distorted OSr4Co2 octahedra that share corners with two equivalent O(10)Sr4Co2 octahedra, corners with two equivalent O(3)Sr2Co2 tetrahedra, corners with two equivalent O(9)Sr2Co2 tetrahedra, edges with two equivalent O(10)Sr4Co2 octahedra, faces with two equivalent O(6)Sr4Co2 octahedra, and faces with two equivalent O(8)Sr4Co2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the sixth O site, O(6) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Co(2), and one Co(4) atom to form distorted OSr4Co2 octahedra that share corners with two equivalent O(8)Sr4Co2 octahedra, corners with two equivalent O(3)Sr2Co2 tetrahedra, corners with two equivalent O(9)Sr2Co2 tetrahedra, edges with two equivalent O(8)Sr4Co2 octahedra, faces with two equivalent O(10)Sr4Co2 octahedra, and faces with two equivalent O(5)Sr4Co2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), one Co(2), and one Co(3) atom. In the eighth O site, O(8) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Co(2), and one Co(4) atom to form distorted OSr4Co2 octahedra that share corners with two equivalent O(6)Sr4Co2 octahedra, corners with two equivalent O(3)Sr2Co2 tetrahedra, corners with two equivalent O(9)Sr2Co2 tetrahedra, edges with two equivalent O(6)Sr4Co2 octahedra, faces with two equivalent O(10)Sr4Co2 octahedra, and faces with two equivalent O(5)Sr4Co2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the ninth O site, O(9) is bonded to one Sr(3), one Sr(4), one Co(1), and one Co(3) atom to form distorted OSr2Co2 tetrahedra that share corners with two equivalent O(10)Sr4Co2 octahedra, corners with two equivalent O(5)Sr4Co2 octahedra, corners with two equivalent O(6)Sr4Co2 octahedra, corners with two equivalent O(8)Sr4Co2 octahedra, and corners with two equivalent O(3)Sr2Co2 tetrahedra. The corner-sharing octahedral tilt angles range from 24-69°. In the tenth O site, O(10) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Co(2), and one Co(4) atom to form distorted OSr4Co2 octahedra that share corners with two equivalent O(5)Sr4Co2 octahedra, corners with two equivalent O(3)Sr2Co2 tetrahedra, corners with two equivalent O(9)Sr2Co2 tetrahedra, edges with two equivalent O(5)Sr4Co2 octahedra, faces with two equivalent O(6)Sr4Co2 octahedra, and faces with two equivalent O(8)Sr4Co2 octahedra. The corner-sharing octahedral tilt angles are 1°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2Co2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.328
_cell_length_b   5.411
_cell_length_c   8.960
_cell_angle_alpha   107.556
_cell_angle_beta   107.309
_cell_angle_gamma   89.963
_symmetry_Int_Tables_number   1
_cell_volume   234.019
_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  0.378  0.881  0.778  1.0
  Sr  Sr1  1  0.101  0.603  0.222  1.0
  Sr  Sr2  1  0.879  0.397  0.778  1.0
  Sr  Sr3  1  0.601  0.119  0.222  1.0
  Co  Co4  1  0.275  0.188  0.500  1.0
  Co  Co5  1  0.988  1.000  0.000  1.0
  Co  Co6  1  0.776  0.812  0.500  1.0
  Co  Co7  1  0.487  0.500  1.000  1.0
  O  O8  1  0.336  0.383  0.714  1.0
  O  O9  1  0.623  0.617  0.286  1.0
  O  O10  1  0.133  0.863  0.500  1.0
  O  O11  1  0.122  0.167  0.285  1.0
  O  O12  1  0.742  0.752  0.006  1.0
  O  O13  1  0.242  0.754  0.006  1.0
  O  O14  1  0.837  0.832  0.715  1.0
  O  O15  1  0.736  0.248  0.994  1.0
  O  O16  1  0.633  0.137  0.500  1.0
  O  O17  1  0.235  0.246  0.994  1.0
[/CIF]
.