The crystal structure described by Sr2Y2Co2O7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 9-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), and four equivalent O(4) atoms. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. In the second Y site, Y(2) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form distorted YO4 trigonal pyramids that share corners with two equivalent Co(1)O5 trigonal bipyramids and corners with two equivalent Y(2)O4 trigonal pyramids. Co(1) is bonded to one O(4), two equivalent O(2), and two equivalent O(3) atoms to form CoO5 trigonal bipyramids that share corners with four equivalent Co(1)O5 trigonal bipyramids and  a cornercorner with one Y(2)O4 trigonal pyramid. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 6-coordinate geometry to four equivalent Sr(1), one Y(2), and one Co(1) atom. In the second O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Y(2) atoms. In the third O site, O(2) is bonded to two equivalent Sr(1), two equivalent Y(1), and two equivalent Co(1) atoms to form a mixture of distorted face and corner-sharing OSr2Y2Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-70°. In the fourth O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Y(1), and two equivalent Co(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2Y2Co2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.681
_cell_length_b   12.681
_cell_length_c   12.681
_cell_angle_alpha   154.790
_cell_angle_beta   154.419
_cell_angle_gamma   36.223
_symmetry_Int_Tables_number   1
_cell_volume   374.529
_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  0.339  0.840  0.459  1.0
  Sr  Sr1  1  0.661  0.121  0.502  1.0
  Sr  Sr2  1  0.119  0.621  0.459  1.0
  Sr  Sr3  1  0.881  0.340  0.502  1.0
  Y  Y4  1  0.000  0.470  0.470  1.0
  Y  Y5  1  0.500  0.970  0.470  1.0
  Y  Y6  1  0.704  0.768  0.972  1.0
  Y  Y7  1  0.296  0.268  0.065  1.0
  Co  Co8  1  0.428  0.396  0.975  1.0
  Co  Co9  1  0.572  0.547  0.968  1.0
  Co  Co10  1  0.079  0.047  0.975  1.0
  Co  Co11  1  0.921  0.896  0.968  1.0
  O  O12  1  0.325  0.668  0.493  1.0
  O  O13  1  0.675  0.168  0.344  1.0
  O  O14  1  0.201  0.668  0.988  1.0
  O  O15  1  0.799  0.787  0.467  1.0
  O  O16  1  0.820  0.287  0.988  1.0
  O  O17  1  0.180  0.168  0.467  1.0
  O  O18  1  0.679  0.148  0.950  1.0
  O  O19  1  0.321  0.271  0.469  1.0
  O  O20  1  0.302  0.771  0.950  1.0
  O  O21  1  0.698  0.648  0.469  1.0
  O  O22  1  0.876  0.784  0.988  1.0
  O  O23  1  0.124  0.112  0.908  1.0
  O  O24  1  0.705  0.612  0.988  1.0
  O  O25  1  0.295  0.284  0.908  1.0
[/CIF]
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The crystal structure described by Sr2Y2Co2O7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 9-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), and four equivalent O(4) atoms. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. In the second Y site, Y(2) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form distorted YO4 trigonal pyramids that share corners with two equivalent Co(1)O5 trigonal bipyramids and corners with two equivalent Y(2)O4 trigonal pyramids. Co(1) is bonded to one O(4), two equivalent O(2), and two equivalent O(3) atoms to form CoO5 trigonal bipyramids that share corners with four equivalent Co(1)O5 trigonal bipyramids and  a cornercorner with one Y(2)O4 trigonal pyramid. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 6-coordinate geometry to four equivalent Sr(1), one Y(2), and one Co(1) atom. In the second O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Y(2) atoms. In the third O site, O(2) is bonded to two equivalent Sr(1), two equivalent Y(1), and two equivalent Co(1) atoms to form a mixture of distorted face and corner-sharing OSr2Y2Co2 octahedra. The corner-sharing octahedral tilt angles range from 2-70°. In the fourth O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Y(1), and two equivalent Co(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2Y2Co2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.681
_cell_length_b   12.681
_cell_length_c   12.681
_cell_angle_alpha   154.790
_cell_angle_beta   154.419
_cell_angle_gamma   36.223
_symmetry_Int_Tables_number   1
_cell_volume   374.529
_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  0.339  0.840  0.459  1.0
  Sr  Sr1  1  0.661  0.121  0.502  1.0
  Sr  Sr2  1  0.119  0.621  0.459  1.0
  Sr  Sr3  1  0.881  0.340  0.502  1.0
  Y  Y4  1  0.000  0.470  0.470  1.0
  Y  Y5  1  0.500  0.970  0.470  1.0
  Y  Y6  1  0.704  0.768  0.972  1.0
  Y  Y7  1  0.296  0.268  0.065  1.0
  Co  Co8  1  0.428  0.396  0.975  1.0
  Co  Co9  1  0.572  0.547  0.968  1.0
  Co  Co10  1  0.079  0.047  0.975  1.0
  Co  Co11  1  0.921  0.896  0.968  1.0
  O  O12  1  0.325  0.668  0.493  1.0
  O  O13  1  0.675  0.168  0.344  1.0
  O  O14  1  0.201  0.668  0.988  1.0
  O  O15  1  0.799  0.787  0.467  1.0
  O  O16  1  0.820  0.287  0.988  1.0
  O  O17  1  0.180  0.168  0.467  1.0
  O  O18  1  0.679  0.148  0.950  1.0
  O  O19  1  0.321  0.271  0.469  1.0
  O  O20  1  0.302  0.771  0.950  1.0
  O  O21  1  0.698  0.648  0.469  1.0
  O  O22  1  0.876  0.784  0.988  1.0
  O  O23  1  0.124  0.112  0.908  1.0
  O  O24  1  0.705  0.612  0.988  1.0
  O  O25  1  0.295  0.284  0.908  1.0
[/CIF]
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