The structure described by Sr2Y2Sn2O7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), and two equivalent O(4) atoms. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 4-coordinate geometry to two equivalent O(2) and two 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 corner-sharing YO4 tetrahedra. Sn(1) is bonded in a 3-coordinate geometry to one O(2), one O(4), and two equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(4) is bonded in a rectangular see-saw-like geometry to two equivalent Sr(1), one Y(2), and one Sn(1) atom. In the second O site, O(1) is bonded to two equivalent Sr(1) and two equivalent Y(2) atoms to form corner-sharing OSr2Y2 tetrahedra. In the third O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Y(1), and one Sn(1) atom. In the fourth O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Sr(1), one Y(1), and two equivalent Sn(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2Y2Sn2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.918
_cell_length_b   11.918
_cell_length_c   11.918
_cell_angle_alpha   46.541
_cell_angle_beta   146.322
_cell_angle_gamma   148.834
_symmetry_Int_Tables_number   1
_cell_volume   484.013
_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  0.047  0.815  0.924  1.0
  Sr  Sr1  1  0.891  0.123  0.076  1.0
  Sr  Sr2  1  0.047  0.623  0.732  1.0
  Sr  Sr3  1  0.891  0.315  0.268  1.0
  Y  Y4  1  0.011  0.511  0.500  1.0
  Y  Y5  1  0.011  0.011  0.000  1.0
  Y  Y6  1  0.552  0.702  0.350  1.0
  Y  Y7  1  0.352  0.202  0.650  1.0
  Sn  Sn8  1  0.489  0.443  0.897  1.0
  Sn  Sn9  1  0.546  0.592  0.103  1.0
  Sn  Sn10  1  0.489  0.092  0.546  1.0
  Sn  Sn11  1  0.546  0.943  0.454  1.0
  O  O12  1  0.993  0.854  0.639  1.0
  O  O13  1  0.215  0.354  0.361  1.0
  O  O14  1  0.345  0.154  0.055  1.0
  O  O15  1  0.098  0.289  0.945  1.0
  O  O16  1  0.345  0.789  0.691  1.0
  O  O17  1  0.098  0.654  0.309  1.0
  O  O18  1  0.720  0.827  0.731  1.0
  O  O19  1  0.095  0.988  0.269  1.0
  O  O20  1  0.720  0.488  0.393  1.0
  O  O21  1  0.095  0.327  0.607  1.0
  O  O22  1  0.493  0.886  0.258  1.0
  O  O23  1  0.628  0.235  0.742  1.0
  O  O24  1  0.493  0.735  0.107  1.0
  O  O25  1  0.628  0.386  0.893  1.0
[/CIF]
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The structure described by Sr2Y2Sn2O7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), and two equivalent O(4) atoms. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 4-coordinate geometry to two equivalent O(2) and two 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 corner-sharing YO4 tetrahedra. Sn(1) is bonded in a 3-coordinate geometry to one O(2), one O(4), and two equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(4) is bonded in a rectangular see-saw-like geometry to two equivalent Sr(1), one Y(2), and one Sn(1) atom. In the second O site, O(1) is bonded to two equivalent Sr(1) and two equivalent Y(2) atoms to form corner-sharing OSr2Y2 tetrahedra. In the third O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Y(1), and one Sn(1) atom. In the fourth O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Sr(1), one Y(1), and two equivalent Sn(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2Y2Sn2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.918
_cell_length_b   11.918
_cell_length_c   11.918
_cell_angle_alpha   46.541
_cell_angle_beta   146.322
_cell_angle_gamma   148.834
_symmetry_Int_Tables_number   1
_cell_volume   484.013
_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  0.047  0.815  0.924  1.0
  Sr  Sr1  1  0.891  0.123  0.076  1.0
  Sr  Sr2  1  0.047  0.623  0.732  1.0
  Sr  Sr3  1  0.891  0.315  0.268  1.0
  Y  Y4  1  0.011  0.511  0.500  1.0
  Y  Y5  1  0.011  0.011  0.000  1.0
  Y  Y6  1  0.552  0.702  0.350  1.0
  Y  Y7  1  0.352  0.202  0.650  1.0
  Sn  Sn8  1  0.489  0.443  0.897  1.0
  Sn  Sn9  1  0.546  0.592  0.103  1.0
  Sn  Sn10  1  0.489  0.092  0.546  1.0
  Sn  Sn11  1  0.546  0.943  0.454  1.0
  O  O12  1  0.993  0.854  0.639  1.0
  O  O13  1  0.215  0.354  0.361  1.0
  O  O14  1  0.345  0.154  0.055  1.0
  O  O15  1  0.098  0.289  0.945  1.0
  O  O16  1  0.345  0.789  0.691  1.0
  O  O17  1  0.098  0.654  0.309  1.0
  O  O18  1  0.720  0.827  0.731  1.0
  O  O19  1  0.095  0.988  0.269  1.0
  O  O20  1  0.720  0.488  0.393  1.0
  O  O21  1  0.095  0.327  0.607  1.0
  O  O22  1  0.493  0.886  0.258  1.0
  O  O23  1  0.628  0.235  0.742  1.0
  O  O24  1  0.493  0.735  0.107  1.0
  O  O25  1  0.628  0.386  0.893  1.0
[/CIF]
.