The material structure described by Sr2YFe2O7 crystallizes in the orthorhombic Imma space group. Sr(1) is bonded to two equivalent O(1) and four equivalent O(4) atoms to form distorted SrO6 pentagonal pyramids that share corners with six equivalent Sr(1)O6 pentagonal pyramids, corners with four equivalent Fe(1)O5 trigonal bipyramids, edges with three equivalent Sr(1)O6 pentagonal pyramids, and faces with two equivalent Sr(1)O6 pentagonal pyramids. Y(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. Fe(1) is bonded to one O(4), two equivalent O(2), and two equivalent O(3) atoms to form distorted FeO5 trigonal bipyramids that share corners with four equivalent Sr(1)O6 pentagonal pyramids and corners with four equivalent Fe(1)O5 trigonal bipyramids. There are four inequivalent O sites. In the first O site, O(1) is bonded in a square co-planar geometry to four equivalent Sr(1) atoms. In the second O site, O(2) is bonded to two equivalent Y(1) and two equivalent Fe(1) atoms to form a mixture of edge and corner-sharing OY2Fe2 tetrahedra. In the third O site, O(3) is bonded to two equivalent Y(1) and two equivalent Fe(1) atoms to form a mixture of distorted edge and corner-sharing OY2Fe2 trigonal pyramids. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to four equivalent Sr(1) and one Fe(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2YFe2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   13.337
_cell_length_b   13.337
_cell_length_c   13.337
_cell_angle_alpha   157.091
_cell_angle_beta   156.945
_cell_angle_gamma   32.727
_symmetry_Int_Tables_number   1
_cell_volume   361.312
_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  0.822  0.781  0.959  1.0
  Sr  Sr1  1  0.178  0.219  0.041  1.0
  Sr  Sr2  1  0.678  0.636  0.959  1.0
  Sr  Sr3  1  0.322  0.364  0.041  1.0
  Y  Y4  1  0.500  0.500  0.000  1.0
  Y  Y5  1  0.000  0.000  0.000  1.0
  Fe  Fe6  1  0.419  0.928  0.509  1.0
  Fe  Fe7  1  0.581  0.072  0.491  1.0
  Fe  Fe8  1  0.081  0.590  0.509  1.0
  Fe  Fe9  1  0.919  0.410  0.491  1.0
  O  O10  1  0.000  0.500  0.000  1.0
  O  O11  1  0.500  0.500  0.500  1.0
  O  O12  1  0.198  0.198  0.500  1.0
  O  O13  1  0.302  0.802  0.000  1.0
  O  O14  1  0.802  0.802  0.500  1.0
  O  O15  1  0.698  0.198  0.000  1.0
  O  O16  1  0.690  0.690  0.500  1.0
  O  O17  1  0.810  0.310  0.000  1.0
  O  O18  1  0.310  0.310  0.500  1.0
  O  O19  1  0.190  0.690  0.000  1.0
  O  O20  1  0.846  0.317  0.470  1.0
  O  O21  1  0.154  0.683  0.530  1.0
  O  O22  1  0.654  0.124  0.470  1.0
  O  O23  1  0.346  0.876  0.530  1.0
[/CIF]
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The material structure described by Sr2YFe2O7 crystallizes in the orthorhombic Imma space group. Sr(1) is bonded to two equivalent O(1) and four equivalent O(4) atoms to form distorted SrO6 pentagonal pyramids that share corners with six equivalent Sr(1)O6 pentagonal pyramids, corners with four equivalent Fe(1)O5 trigonal bipyramids, edges with three equivalent Sr(1)O6 pentagonal pyramids, and faces with two equivalent Sr(1)O6 pentagonal pyramids. Y(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. Fe(1) is bonded to one O(4), two equivalent O(2), and two equivalent O(3) atoms to form distorted FeO5 trigonal bipyramids that share corners with four equivalent Sr(1)O6 pentagonal pyramids and corners with four equivalent Fe(1)O5 trigonal bipyramids. There are four inequivalent O sites. In the first O site, O(1) is bonded in a square co-planar geometry to four equivalent Sr(1) atoms. In the second O site, O(2) is bonded to two equivalent Y(1) and two equivalent Fe(1) atoms to form a mixture of edge and corner-sharing OY2Fe2 tetrahedra. In the third O site, O(3) is bonded to two equivalent Y(1) and two equivalent Fe(1) atoms to form a mixture of distorted edge and corner-sharing OY2Fe2 trigonal pyramids. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to four equivalent Sr(1) and one Fe(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2YFe2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   13.337
_cell_length_b   13.337
_cell_length_c   13.337
_cell_angle_alpha   157.091
_cell_angle_beta   156.945
_cell_angle_gamma   32.727
_symmetry_Int_Tables_number   1
_cell_volume   361.312
_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  0.822  0.781  0.959  1.0
  Sr  Sr1  1  0.178  0.219  0.041  1.0
  Sr  Sr2  1  0.678  0.636  0.959  1.0
  Sr  Sr3  1  0.322  0.364  0.041  1.0
  Y  Y4  1  0.500  0.500  0.000  1.0
  Y  Y5  1  0.000  0.000  0.000  1.0
  Fe  Fe6  1  0.419  0.928  0.509  1.0
  Fe  Fe7  1  0.581  0.072  0.491  1.0
  Fe  Fe8  1  0.081  0.590  0.509  1.0
  Fe  Fe9  1  0.919  0.410  0.491  1.0
  O  O10  1  0.000  0.500  0.000  1.0
  O  O11  1  0.500  0.500  0.500  1.0
  O  O12  1  0.198  0.198  0.500  1.0
  O  O13  1  0.302  0.802  0.000  1.0
  O  O14  1  0.802  0.802  0.500  1.0
  O  O15  1  0.698  0.198  0.000  1.0
  O  O16  1  0.690  0.690  0.500  1.0
  O  O17  1  0.810  0.310  0.000  1.0
  O  O18  1  0.310  0.310  0.500  1.0
  O  O19  1  0.190  0.690  0.000  1.0
  O  O20  1  0.846  0.317  0.470  1.0
  O  O21  1  0.154  0.683  0.530  1.0
  O  O22  1  0.654  0.124  0.470  1.0
  O  O23  1  0.346  0.876  0.530  1.0
[/CIF]
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