The structure described by Er2Pt2O7 crystallizes in the cubic Fd-3m space group. Er(1) is bonded in a body-centered cubic geometry to two equivalent O(2) and six equivalent O(1) atoms. Pt(1) is bonded to six equivalent O(1) atoms to form corner-sharing PtO6 octahedra. The corner-sharing octahedral tilt angles are 55°. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Er(1) and two equivalent Pt(1) atoms to form OEr2Pt2 tetrahedra that share corners with two equivalent O(2)Er4 tetrahedra, corners with twelve equivalent O(1)Er2Pt2 tetrahedra,  an edgeedge with one O(2)Er4 tetrahedra, and edges with four equivalent O(1)Er2Pt2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Er(1) atoms to form OEr4 tetrahedra that share corners with four equivalent O(2)Er4 tetrahedra, corners with twelve equivalent O(1)Er2Pt2 tetrahedra, and edges with six equivalent O(1)Er2Pt2 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er2Pt2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.160
_cell_length_b   7.160
_cell_length_c   7.160
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   259.562
_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
  Er  Er0  1  0.625  0.625  0.125  1.0
  Er  Er1  1  0.625  0.625  0.625  1.0
  Er  Er2  1  0.625  0.125  0.625  1.0
  Er  Er3  1  0.125  0.625  0.625  1.0
  Pt  Pt4  1  0.625  0.125  0.125  1.0
  Pt  Pt5  1  0.125  0.125  0.125  1.0
  Pt  Pt6  1  0.125  0.625  0.125  1.0
  Pt  Pt7  1  0.125  0.125  0.625  1.0
  O  O8  1  0.033  0.467  0.467  1.0
  O  O9  1  0.783  0.783  0.217  1.0
  O  O10  1  0.783  0.217  0.217  1.0
  O  O11  1  0.750  0.750  0.750  1.0
  O  O12  1  0.033  0.467  0.033  1.0
  O  O13  1  0.467  0.033  0.467  1.0
  O  O14  1  0.033  0.033  0.467  1.0
  O  O15  1  0.500  0.500  0.500  1.0
  O  O16  1  0.217  0.217  0.783  1.0
  O  O17  1  0.217  0.783  0.217  1.0
  O  O18  1  0.783  0.217  0.783  1.0
  O  O19  1  0.467  0.033  0.033  1.0
  O  O20  1  0.467  0.467  0.033  1.0
  O  O21  1  0.217  0.783  0.783  1.0
[/CIF]
.
The structure described by Er2Pt2O7 crystallizes in the cubic Fd-3m space group. Er(1) is bonded in a body-centered cubic geometry to two equivalent O(2) and six equivalent O(1) atoms. Pt(1) is bonded to six equivalent O(1) atoms to form corner-sharing PtO6 octahedra. The corner-sharing octahedral tilt angles are 55°. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Er(1) and two equivalent Pt(1) atoms to form OEr2Pt2 tetrahedra that share corners with two equivalent O(2)Er4 tetrahedra, corners with twelve equivalent O(1)Er2Pt2 tetrahedra,  an edgeedge with one O(2)Er4 tetrahedra, and edges with four equivalent O(1)Er2Pt2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Er(1) atoms to form OEr4 tetrahedra that share corners with four equivalent O(2)Er4 tetrahedra, corners with twelve equivalent O(1)Er2Pt2 tetrahedra, and edges with six equivalent O(1)Er2Pt2 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er2Pt2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.160
_cell_length_b   7.160
_cell_length_c   7.160
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   259.562
_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
  Er  Er0  1  0.625  0.625  0.125  1.0
  Er  Er1  1  0.625  0.625  0.625  1.0
  Er  Er2  1  0.625  0.125  0.625  1.0
  Er  Er3  1  0.125  0.625  0.625  1.0
  Pt  Pt4  1  0.625  0.125  0.125  1.0
  Pt  Pt5  1  0.125  0.125  0.125  1.0
  Pt  Pt6  1  0.125  0.625  0.125  1.0
  Pt  Pt7  1  0.125  0.125  0.625  1.0
  O  O8  1  0.033  0.467  0.467  1.0
  O  O9  1  0.783  0.783  0.217  1.0
  O  O10  1  0.783  0.217  0.217  1.0
  O  O11  1  0.750  0.750  0.750  1.0
  O  O12  1  0.033  0.467  0.033  1.0
  O  O13  1  0.467  0.033  0.467  1.0
  O  O14  1  0.033  0.033  0.467  1.0
  O  O15  1  0.500  0.500  0.500  1.0
  O  O16  1  0.217  0.217  0.783  1.0
  O  O17  1  0.217  0.783  0.217  1.0
  O  O18  1  0.783  0.217  0.783  1.0
  O  O19  1  0.467  0.033  0.033  1.0
  O  O20  1  0.467  0.467  0.033  1.0
  O  O21  1  0.217  0.783  0.783  1.0
[/CIF]
.