The structure described by ErPt2Si2 crystallizes in the tetragonal I4/mmm space group. Er(1) is bonded in a 16-coordinate geometry to eight equivalent Pt(1) and eight equivalent Si(1) atoms. Pt(1) is bonded in a 4-coordinate geometry to four equivalent Er(1) and four equivalent Si(1) atoms. Si(1) is bonded to four equivalent Er(1) and four equivalent Pt(1) atoms to form a mixture of distorted corner, edge, and face-sharing SiEr4Pt4 tetrahedra. is represented by the CIF file [CIF]
data_Er(SiPt)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.858
_cell_length_b   5.858
_cell_length_c   5.858
_cell_angle_alpha   138.033
_cell_angle_beta   138.033
_cell_angle_gamma   60.853
_symmetry_Int_Tables_number   1
_cell_volume   88.902
_cell_formula_units_Z   1
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  0.000  0.000  0.000  1.0
  Si  Si1  1  0.750  0.250  0.500  1.0
  Si  Si2  1  0.250  0.750  0.500  1.0
  Pt  Pt3  1  0.632  0.632  0.000  1.0
  Pt  Pt4  1  0.368  0.368  0.000  1.0
[/CIF]
.
The structure described by ErPt2Si2 crystallizes in the tetragonal I4/mmm space group. Er(1) is bonded in a 16-coordinate geometry to eight equivalent Pt(1) and eight equivalent Si(1) atoms. Pt(1) is bonded in a 4-coordinate geometry to four equivalent Er(1) and four equivalent Si(1) atoms. Si(1) is bonded to four equivalent Er(1) and four equivalent Pt(1) atoms to form a mixture of distorted corner, edge, and face-sharing SiEr4Pt4 tetrahedra. is represented by the CIF file [CIF]
data_Er(SiPt)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.858
_cell_length_b   5.858
_cell_length_c   5.858
_cell_angle_alpha   138.033
_cell_angle_beta   138.033
_cell_angle_gamma   60.853
_symmetry_Int_Tables_number   1
_cell_volume   88.902
_cell_formula_units_Z   1
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  0.000  0.000  0.000  1.0
  Si  Si1  1  0.750  0.250  0.500  1.0
  Si  Si2  1  0.250  0.750  0.500  1.0
  Pt  Pt3  1  0.632  0.632  0.000  1.0
  Pt  Pt4  1  0.368  0.368  0.000  1.0
[/CIF]
.