The crystal structure described by ErRh4B4 crystallizes in the tetragonal I4_1/acd space group. Er(1) is bonded in a 24-coordinate geometry to twelve equivalent Rh(1) and twelve equivalent B(1) atoms. Rh(1) is bonded in a 5-coordinate geometry to three equivalent Er(1) and five equivalent B(1) atoms. B(1) is bonded in a 6-coordinate geometry to three equivalent Er(1), five equivalent Rh(1), and one B(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er(BRh)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.164
_cell_length_b   9.164
_cell_length_c   9.164
_cell_angle_alpha   131.397
_cell_angle_beta   131.397
_cell_angle_gamma   71.183
_symmetry_Int_Tables_number   1
_cell_volume   423.925
_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  0.250  0.250  0.000  1.0
  Er  Er1  1  0.000  0.500  0.500  1.0
  Er  Er2  1  0.500  0.000  0.500  1.0
  Er  Er3  1  0.750  0.750  0.000  1.0
  B  B4  1  0.030  0.497  0.192  1.0
  B  B5  1  0.662  0.194  0.192  1.0
  B  B6  1  0.003  0.470  0.808  1.0
  B  B7  1  0.220  0.912  0.968  1.0
  B  B8  1  0.588  0.280  0.032  1.0
  B  B9  1  0.306  0.838  0.808  1.0
  B  B10  1  0.720  0.753  0.308  1.0
  B  B11  1  0.088  0.056  0.308  1.0
  B  B12  1  0.747  0.780  0.692  1.0
  B  B13  1  0.530  0.338  0.532  1.0
  B  B14  1  0.806  0.997  0.468  1.0
  B  B15  1  0.503  0.694  0.532  1.0
  B  B16  1  0.162  0.970  0.468  1.0
  B  B17  1  0.444  0.412  0.692  1.0
  B  B18  1  0.944  0.253  0.032  1.0
  B  B19  1  0.247  0.556  0.968  1.0
  Rh  Rh20  1  0.217  0.179  0.269  1.0
  Rh  Rh21  1  0.698  0.467  0.538  1.0
  Rh  Rh22  1  0.929  0.160  0.462  1.0
  Rh  Rh23  1  0.033  0.802  0.462  1.0
  Rh  Rh24  1  0.321  0.283  0.731  1.0
  Rh  Rh25  1  0.340  0.571  0.538  1.0
  Rh  Rh26  1  0.717  0.448  0.038  1.0
  Rh  Rh27  1  0.821  0.090  0.038  1.0
  Rh  Rh28  1  0.052  0.783  0.962  1.0
  Rh  Rh29  1  0.533  0.071  0.231  1.0
  Rh  Rh30  1  0.840  0.302  0.769  1.0
  Rh  Rh31  1  0.198  0.660  0.231  1.0
  Rh  Rh32  1  0.429  0.967  0.769  1.0
  Rh  Rh33  1  0.410  0.679  0.962  1.0
  Rh  Rh34  1  0.910  0.948  0.731  1.0
  Rh  Rh35  1  0.552  0.590  0.269  1.0
[/CIF]
.
The crystal structure described by ErRh4B4 crystallizes in the tetragonal I4_1/acd space group. Er(1) is bonded in a 24-coordinate geometry to twelve equivalent Rh(1) and twelve equivalent B(1) atoms. Rh(1) is bonded in a 5-coordinate geometry to three equivalent Er(1) and five equivalent B(1) atoms. B(1) is bonded in a 6-coordinate geometry to three equivalent Er(1), five equivalent Rh(1), and one B(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er(BRh)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.164
_cell_length_b   9.164
_cell_length_c   9.164
_cell_angle_alpha   131.397
_cell_angle_beta   131.397
_cell_angle_gamma   71.183
_symmetry_Int_Tables_number   1
_cell_volume   423.925
_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  0.250  0.250  0.000  1.0
  Er  Er1  1  0.000  0.500  0.500  1.0
  Er  Er2  1  0.500  0.000  0.500  1.0
  Er  Er3  1  0.750  0.750  0.000  1.0
  B  B4  1  0.030  0.497  0.192  1.0
  B  B5  1  0.662  0.194  0.192  1.0
  B  B6  1  0.003  0.470  0.808  1.0
  B  B7  1  0.220  0.912  0.968  1.0
  B  B8  1  0.588  0.280  0.032  1.0
  B  B9  1  0.306  0.838  0.808  1.0
  B  B10  1  0.720  0.753  0.308  1.0
  B  B11  1  0.088  0.056  0.308  1.0
  B  B12  1  0.747  0.780  0.692  1.0
  B  B13  1  0.530  0.338  0.532  1.0
  B  B14  1  0.806  0.997  0.468  1.0
  B  B15  1  0.503  0.694  0.532  1.0
  B  B16  1  0.162  0.970  0.468  1.0
  B  B17  1  0.444  0.412  0.692  1.0
  B  B18  1  0.944  0.253  0.032  1.0
  B  B19  1  0.247  0.556  0.968  1.0
  Rh  Rh20  1  0.217  0.179  0.269  1.0
  Rh  Rh21  1  0.698  0.467  0.538  1.0
  Rh  Rh22  1  0.929  0.160  0.462  1.0
  Rh  Rh23  1  0.033  0.802  0.462  1.0
  Rh  Rh24  1  0.321  0.283  0.731  1.0
  Rh  Rh25  1  0.340  0.571  0.538  1.0
  Rh  Rh26  1  0.717  0.448  0.038  1.0
  Rh  Rh27  1  0.821  0.090  0.038  1.0
  Rh  Rh28  1  0.052  0.783  0.962  1.0
  Rh  Rh29  1  0.533  0.071  0.231  1.0
  Rh  Rh30  1  0.840  0.302  0.769  1.0
  Rh  Rh31  1  0.198  0.660  0.231  1.0
  Rh  Rh32  1  0.429  0.967  0.769  1.0
  Rh  Rh33  1  0.410  0.679  0.962  1.0
  Rh  Rh34  1  0.910  0.948  0.731  1.0
  Rh  Rh35  1  0.552  0.590  0.269  1.0
[/CIF]
.