The material described by ErCr2O2 crystallizes in the tetragonal I4_1/amd space group. Er(1) is bonded in a linear geometry to two equivalent O(1) atoms. Cr(1) is bonded in a 3-coordinate geometry to three equivalent O(1) atoms. O(1) is bonded in a distorted rectangular see-saw-like geometry to one Er(1) and three equivalent Cr(1) atoms. is represented by the CIF file [CIF]
data_ErCr2O2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.886
_cell_length_b   7.886
_cell_length_c   7.886
_cell_angle_alpha   111.980
_cell_angle_beta   111.980
_cell_angle_gamma   104.563
_symmetry_Int_Tables_number   1
_cell_volume   375.458
_cell_formula_units_Z   4
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  0.875  0.125  0.250  1.0
  Er  Er1  1  0.875  0.625  0.750  1.0
  Er  Er2  1  0.375  0.125  0.250  1.0
  Er  Er3  1  0.875  0.125  0.750  1.0
  Cr  Cr4  1  0.517  0.214  0.698  1.0
  Cr  Cr5  1  0.517  0.819  0.302  1.0
  Cr  Cr6  1  0.569  0.767  0.802  1.0
  Cr  Cr7  1  0.233  0.431  0.198  1.0
  Cr  Cr8  1  0.233  0.036  0.802  1.0
  Cr  Cr9  1  0.964  0.767  0.198  1.0
  Cr  Cr10  1  0.181  0.483  0.698  1.0
  Cr  Cr11  1  0.786  0.483  0.302  1.0
  O  O12  1  0.674  0.520  0.846  1.0
  O  O13  1  0.674  0.828  0.154  1.0
  O  O14  1  0.578  0.924  0.654  1.0
  O  O15  1  0.076  0.422  0.346  1.0
  O  O16  1  0.076  0.730  0.654  1.0
  O  O17  1  0.270  0.924  0.346  1.0
  O  O18  1  0.172  0.326  0.846  1.0
  O  O19  1  0.480  0.326  0.154  1.0
[/CIF]
.
The material described by ErCr2O2 crystallizes in the tetragonal I4_1/amd space group. Er(1) is bonded in a linear geometry to two equivalent O(1) atoms. Cr(1) is bonded in a 3-coordinate geometry to three equivalent O(1) atoms. O(1) is bonded in a distorted rectangular see-saw-like geometry to one Er(1) and three equivalent Cr(1) atoms. is represented by the CIF file [CIF]
data_ErCr2O2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.886
_cell_length_b   7.886
_cell_length_c   7.886
_cell_angle_alpha   111.980
_cell_angle_beta   111.980
_cell_angle_gamma   104.563
_symmetry_Int_Tables_number   1
_cell_volume   375.458
_cell_formula_units_Z   4
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  0.875  0.125  0.250  1.0
  Er  Er1  1  0.875  0.625  0.750  1.0
  Er  Er2  1  0.375  0.125  0.250  1.0
  Er  Er3  1  0.875  0.125  0.750  1.0
  Cr  Cr4  1  0.517  0.214  0.698  1.0
  Cr  Cr5  1  0.517  0.819  0.302  1.0
  Cr  Cr6  1  0.569  0.767  0.802  1.0
  Cr  Cr7  1  0.233  0.431  0.198  1.0
  Cr  Cr8  1  0.233  0.036  0.802  1.0
  Cr  Cr9  1  0.964  0.767  0.198  1.0
  Cr  Cr10  1  0.181  0.483  0.698  1.0
  Cr  Cr11  1  0.786  0.483  0.302  1.0
  O  O12  1  0.674  0.520  0.846  1.0
  O  O13  1  0.674  0.828  0.154  1.0
  O  O14  1  0.578  0.924  0.654  1.0
  O  O15  1  0.076  0.422  0.346  1.0
  O  O16  1  0.076  0.730  0.654  1.0
  O  O17  1  0.270  0.924  0.346  1.0
  O  O18  1  0.172  0.326  0.846  1.0
  O  O19  1  0.480  0.326  0.154  1.0
[/CIF]
.