The compound described by Eu2Sn2O7 crystallizes in the cubic Fd-3m space group. Eu(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(2) and six equivalent O(1) atoms. Sn(1) is bonded to six equivalent O(1) atoms to form corner-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles are 51°. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Eu(1) and two equivalent Sn(1) atoms to form distorted OEu2Sn2 tetrahedra that share corners with two equivalent O(2)Eu4 tetrahedra, corners with twelve equivalent O(1)Eu2Sn2 tetrahedra,  an edgeedge with one O(2)Eu4 tetrahedra, and edges with four equivalent O(1)Eu2Sn2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Eu(1) atoms to form OEu4 tetrahedra that share corners with four equivalent O(2)Eu4 tetrahedra, corners with twelve equivalent O(1)Eu2Sn2 tetrahedra, and edges with six equivalent O(1)Eu2Sn2 tetrahedra. is represented by the CIF file [CIF]
data_Eu2Sn2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.446
_cell_length_b   7.446
_cell_length_c   7.446
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   291.960
_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
  Eu  Eu0  1  0.125  0.125  0.125  1.0
  Eu  Eu1  1  0.625  0.125  0.125  1.0
  Eu  Eu2  1  0.125  0.625  0.125  1.0
  Eu  Eu3  1  0.125  0.125  0.625  1.0
  Sn  Sn4  1  0.625  0.625  0.625  1.0
  Sn  Sn5  1  0.125  0.625  0.625  1.0
  Sn  Sn6  1  0.625  0.125  0.625  1.0
  Sn  Sn7  1  0.625  0.625  0.125  1.0
  O  O8  1  0.959  0.541  0.959  1.0
  O  O9  1  0.709  0.291  0.291  1.0
  O  O10  1  0.291  0.709  0.709  1.0
  O  O11  1  0.709  0.291  0.709  1.0
  O  O12  1  0.291  0.291  0.709  1.0
  O  O13  1  0.709  0.709  0.291  1.0
  O  O14  1  0.959  0.959  0.541  1.0
  O  O15  1  0.541  0.959  0.959  1.0
  O  O16  1  0.959  0.541  0.541  1.0
  O  O17  1  0.541  0.541  0.959  1.0
  O  O18  1  0.291  0.709  0.291  1.0
  O  O19  1  0.541  0.959  0.541  1.0
  O  O20  1  0.000  0.000  0.000  1.0
  O  O21  1  0.250  0.250  0.250  1.0
[/CIF]
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The compound described by Eu2Sn2O7 crystallizes in the cubic Fd-3m space group. Eu(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(2) and six equivalent O(1) atoms. Sn(1) is bonded to six equivalent O(1) atoms to form corner-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles are 51°. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Eu(1) and two equivalent Sn(1) atoms to form distorted OEu2Sn2 tetrahedra that share corners with two equivalent O(2)Eu4 tetrahedra, corners with twelve equivalent O(1)Eu2Sn2 tetrahedra,  an edgeedge with one O(2)Eu4 tetrahedra, and edges with four equivalent O(1)Eu2Sn2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Eu(1) atoms to form OEu4 tetrahedra that share corners with four equivalent O(2)Eu4 tetrahedra, corners with twelve equivalent O(1)Eu2Sn2 tetrahedra, and edges with six equivalent O(1)Eu2Sn2 tetrahedra. is represented by the CIF file [CIF]
data_Eu2Sn2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.446
_cell_length_b   7.446
_cell_length_c   7.446
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   291.960
_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
  Eu  Eu0  1  0.125  0.125  0.125  1.0
  Eu  Eu1  1  0.625  0.125  0.125  1.0
  Eu  Eu2  1  0.125  0.625  0.125  1.0
  Eu  Eu3  1  0.125  0.125  0.625  1.0
  Sn  Sn4  1  0.625  0.625  0.625  1.0
  Sn  Sn5  1  0.125  0.625  0.625  1.0
  Sn  Sn6  1  0.625  0.125  0.625  1.0
  Sn  Sn7  1  0.625  0.625  0.125  1.0
  O  O8  1  0.959  0.541  0.959  1.0
  O  O9  1  0.709  0.291  0.291  1.0
  O  O10  1  0.291  0.709  0.709  1.0
  O  O11  1  0.709  0.291  0.709  1.0
  O  O12  1  0.291  0.291  0.709  1.0
  O  O13  1  0.709  0.709  0.291  1.0
  O  O14  1  0.959  0.959  0.541  1.0
  O  O15  1  0.541  0.959  0.959  1.0
  O  O16  1  0.959  0.541  0.541  1.0
  O  O17  1  0.541  0.541  0.959  1.0
  O  O18  1  0.291  0.709  0.291  1.0
  O  O19  1  0.541  0.959  0.541  1.0
  O  O20  1  0.000  0.000  0.000  1.0
  O  O21  1  0.250  0.250  0.250  1.0
[/CIF]
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