The material described by ErFe10Cr2 crystallizes in the orthorhombic Immm space group. Er(1) is bonded in a 20-coordinate geometry to two equivalent Cr(1), two equivalent Fe(4), four equivalent Fe(1), four equivalent Fe(2), and eight equivalent Fe(3) atoms. Cr(1) is bonded in a 14-coordinate geometry to one Er(1), one Cr(1), two equivalent Fe(1), two equivalent Fe(2), four equivalent Fe(3), and four equivalent Fe(4) atoms. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent Er(1), two equivalent Cr(1), two equivalent Fe(2), two equivalent Fe(4), and four equivalent Fe(3) atoms to form a mixture of distorted corner, edge, and face-sharing FeEr2Cr2Fe8 cuboctahedra. In the second Fe site, Fe(2) is bonded to two equivalent Er(1), two equivalent Cr(1), two equivalent Fe(1), two equivalent Fe(4), and four equivalent Fe(3) atoms to form a mixture of distorted corner, edge, and face-sharing FeEr2Cr2Fe8 cuboctahedra. In the third Fe site, Fe(3) is bonded to two equivalent Er(1), two equivalent Cr(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), and two equivalent Fe(4) atoms to form a mixture of distorted corner, edge, and face-sharing FeEr2Cr2Fe8 cuboctahedra. In the fourth Fe site, Fe(4) is bonded in a 14-coordinate geometry to one Er(1), four equivalent Cr(1), one Fe(4), two equivalent Fe(1), two equivalent Fe(2), and four equivalent Fe(3) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er(CrFe5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.681
_cell_length_b   6.378
_cell_length_c   6.378
_cell_angle_alpha   97.406
_cell_angle_beta   111.527
_cell_angle_gamma   68.473
_symmetry_Int_Tables_number   1
_cell_volume   164.781
_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
  Cr  Cr1  1  0.000  0.367  0.367  1.0
  Cr  Cr2  1  0.000  0.633  0.633  1.0
  Fe  Fe3  1  0.725  0.775  0.225  1.0
  Fe  Fe4  1  0.275  0.225  0.775  1.0
  Fe  Fe5  1  0.500  0.773  0.773  1.0
  Fe  Fe6  1  0.500  0.227  0.227  1.0
  Fe  Fe7  1  0.500  0.000  0.500  1.0
  Fe  Fe8  1  0.000  0.000  0.500  1.0
  Fe  Fe9  1  0.500  0.500  0.000  1.0
  Fe  Fe10  1  0.000  0.500  0.000  1.0
  Fe  Fe11  1  0.641  0.359  0.641  1.0
  Fe  Fe12  1  0.359  0.641  0.359  1.0
[/CIF]
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The material described by ErFe10Cr2 crystallizes in the orthorhombic Immm space group. Er(1) is bonded in a 20-coordinate geometry to two equivalent Cr(1), two equivalent Fe(4), four equivalent Fe(1), four equivalent Fe(2), and eight equivalent Fe(3) atoms. Cr(1) is bonded in a 14-coordinate geometry to one Er(1), one Cr(1), two equivalent Fe(1), two equivalent Fe(2), four equivalent Fe(3), and four equivalent Fe(4) atoms. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent Er(1), two equivalent Cr(1), two equivalent Fe(2), two equivalent Fe(4), and four equivalent Fe(3) atoms to form a mixture of distorted corner, edge, and face-sharing FeEr2Cr2Fe8 cuboctahedra. In the second Fe site, Fe(2) is bonded to two equivalent Er(1), two equivalent Cr(1), two equivalent Fe(1), two equivalent Fe(4), and four equivalent Fe(3) atoms to form a mixture of distorted corner, edge, and face-sharing FeEr2Cr2Fe8 cuboctahedra. In the third Fe site, Fe(3) is bonded to two equivalent Er(1), two equivalent Cr(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), and two equivalent Fe(4) atoms to form a mixture of distorted corner, edge, and face-sharing FeEr2Cr2Fe8 cuboctahedra. In the fourth Fe site, Fe(4) is bonded in a 14-coordinate geometry to one Er(1), four equivalent Cr(1), one Fe(4), two equivalent Fe(1), two equivalent Fe(2), and four equivalent Fe(3) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er(CrFe5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.681
_cell_length_b   6.378
_cell_length_c   6.378
_cell_angle_alpha   97.406
_cell_angle_beta   111.527
_cell_angle_gamma   68.473
_symmetry_Int_Tables_number   1
_cell_volume   164.781
_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
  Cr  Cr1  1  0.000  0.367  0.367  1.0
  Cr  Cr2  1  0.000  0.633  0.633  1.0
  Fe  Fe3  1  0.725  0.775  0.225  1.0
  Fe  Fe4  1  0.275  0.225  0.775  1.0
  Fe  Fe5  1  0.500  0.773  0.773  1.0
  Fe  Fe6  1  0.500  0.227  0.227  1.0
  Fe  Fe7  1  0.500  0.000  0.500  1.0
  Fe  Fe8  1  0.000  0.000  0.500  1.0
  Fe  Fe9  1  0.500  0.500  0.000  1.0
  Fe  Fe10  1  0.000  0.500  0.000  1.0
  Fe  Fe11  1  0.641  0.359  0.641  1.0
  Fe  Fe12  1  0.359  0.641  0.359  1.0
[/CIF]
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