The compound described by MgEr4Rh crystallizes in the cubic F-43m space group. Mg(1) is bonded to three equivalent Mg(1), three equivalent Er(1), three equivalent Er(2), and three equivalent Er(3) atoms to form a mixture of corner and face-sharing MgEr9Mg3 cuboctahedra. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 3-coordinate geometry to three equivalent Mg(1), three equivalent Er(3), and three equivalent Rh(1) atoms. In the second Er site, Er(2) is bonded in a bent 150 degrees geometry to two equivalent Mg(1), four equivalent Er(3), and two equivalent Rh(1) atoms. In the third Er site, Er(3) is bonded in a 14-coordinate geometry to two equivalent Mg(1), two equivalent Er(1), four equivalent Er(2), four equivalent Er(3), and two equivalent Rh(1) atoms. Rh(1) is bonded in a 6-coordinate geometry to three equivalent Er(1), three equivalent Er(2), and three equivalent Er(3) atoms. is represented by the CIF file [CIF]
data_Er4MgRh
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.579
_cell_length_b   9.579
_cell_length_c   9.579
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   621.416
_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  0.346  0.346  0.346  1.0
  Er  Er1  1  0.346  0.346  0.962  1.0
  Er  Er2  1  0.346  0.962  0.346  1.0
  Er  Er3  1  0.962  0.346  0.346  1.0
  Er  Er4  1  0.813  0.187  0.187  1.0
  Er  Er5  1  0.187  0.813  0.813  1.0
  Er  Er6  1  0.187  0.813  0.187  1.0
  Er  Er7  1  0.813  0.187  0.813  1.0
  Er  Er8  1  0.187  0.187  0.813  1.0
  Er  Er9  1  0.813  0.813  0.187  1.0
  Er  Er10  1  0.936  0.564  0.564  1.0
  Er  Er11  1  0.564  0.936  0.936  1.0
  Er  Er12  1  0.564  0.936  0.564  1.0
  Er  Er13  1  0.936  0.564  0.936  1.0
  Er  Er14  1  0.564  0.564  0.936  1.0
  Er  Er15  1  0.936  0.936  0.564  1.0
  Mg  Mg16  1  0.579  0.579  0.579  1.0
  Mg  Mg17  1  0.579  0.579  0.262  1.0
  Mg  Mg18  1  0.579  0.262  0.579  1.0
  Mg  Mg19  1  0.262  0.579  0.579  1.0
  Rh  Rh20  1  0.142  0.142  0.142  1.0
  Rh  Rh21  1  0.142  0.142  0.575  1.0
  Rh  Rh22  1  0.142  0.575  0.142  1.0
  Rh  Rh23  1  0.575  0.142  0.142  1.0
[/CIF]
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The compound described by MgEr4Rh crystallizes in the cubic F-43m space group. Mg(1) is bonded to three equivalent Mg(1), three equivalent Er(1), three equivalent Er(2), and three equivalent Er(3) atoms to form a mixture of corner and face-sharing MgEr9Mg3 cuboctahedra. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 3-coordinate geometry to three equivalent Mg(1), three equivalent Er(3), and three equivalent Rh(1) atoms. In the second Er site, Er(2) is bonded in a bent 150 degrees geometry to two equivalent Mg(1), four equivalent Er(3), and two equivalent Rh(1) atoms. In the third Er site, Er(3) is bonded in a 14-coordinate geometry to two equivalent Mg(1), two equivalent Er(1), four equivalent Er(2), four equivalent Er(3), and two equivalent Rh(1) atoms. Rh(1) is bonded in a 6-coordinate geometry to three equivalent Er(1), three equivalent Er(2), and three equivalent Er(3) atoms. is represented by the CIF file [CIF]
data_Er4MgRh
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.579
_cell_length_b   9.579
_cell_length_c   9.579
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   621.416
_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  0.346  0.346  0.346  1.0
  Er  Er1  1  0.346  0.346  0.962  1.0
  Er  Er2  1  0.346  0.962  0.346  1.0
  Er  Er3  1  0.962  0.346  0.346  1.0
  Er  Er4  1  0.813  0.187  0.187  1.0
  Er  Er5  1  0.187  0.813  0.813  1.0
  Er  Er6  1  0.187  0.813  0.187  1.0
  Er  Er7  1  0.813  0.187  0.813  1.0
  Er  Er8  1  0.187  0.187  0.813  1.0
  Er  Er9  1  0.813  0.813  0.187  1.0
  Er  Er10  1  0.936  0.564  0.564  1.0
  Er  Er11  1  0.564  0.936  0.936  1.0
  Er  Er12  1  0.564  0.936  0.564  1.0
  Er  Er13  1  0.936  0.564  0.936  1.0
  Er  Er14  1  0.564  0.564  0.936  1.0
  Er  Er15  1  0.936  0.936  0.564  1.0
  Mg  Mg16  1  0.579  0.579  0.579  1.0
  Mg  Mg17  1  0.579  0.579  0.262  1.0
  Mg  Mg18  1  0.579  0.262  0.579  1.0
  Mg  Mg19  1  0.262  0.579  0.579  1.0
  Rh  Rh20  1  0.142  0.142  0.142  1.0
  Rh  Rh21  1  0.142  0.142  0.575  1.0
  Rh  Rh22  1  0.142  0.575  0.142  1.0
  Rh  Rh23  1  0.575  0.142  0.142  1.0
[/CIF]
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