The material described by Er2B4C crystallizes in the orthorhombic Immm space group. Er(1) is bonded in a 2-coordinate geometry to six equivalent B(1) and two equivalent C(1) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to six equivalent Er(1), one B(1), and two equivalent B(2) atoms. In the second B site, B(2) is bonded in a single-bond geometry to two equivalent B(1) and one C(1) atom. C(1) is bonded to four equivalent Er(1) and two equivalent B(2) atoms to form distorted edge-sharing CEr4B2 octahedra. is represented by the CIF file [CIF]
data_Er2B4C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.249
_cell_length_b   5.206
_cell_length_c   5.206
_cell_angle_alpha   78.135
_cell_angle_beta   71.820
_cell_angle_gamma   71.820
_symmetry_Int_Tables_number   1
_cell_volume   78.899
_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  0.267  0.233  0.233  1.0
  Er  Er1  1  0.733  0.767  0.767  1.0
  B  B2  1  0.500  0.366  0.634  1.0
  B  B3  1  0.500  0.634  0.366  1.0
  B  B4  1  0.000  0.773  0.227  1.0
  B  B5  1  0.000  0.227  0.773  1.0
  C  C6  1  0.000  0.000  0.000  1.0
[/CIF]
.
The material described by Er2B4C crystallizes in the orthorhombic Immm space group. Er(1) is bonded in a 2-coordinate geometry to six equivalent B(1) and two equivalent C(1) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to six equivalent Er(1), one B(1), and two equivalent B(2) atoms. In the second B site, B(2) is bonded in a single-bond geometry to two equivalent B(1) and one C(1) atom. C(1) is bonded to four equivalent Er(1) and two equivalent B(2) atoms to form distorted edge-sharing CEr4B2 octahedra. is represented by the CIF file [CIF]
data_Er2B4C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.249
_cell_length_b   5.206
_cell_length_c   5.206
_cell_angle_alpha   78.135
_cell_angle_beta   71.820
_cell_angle_gamma   71.820
_symmetry_Int_Tables_number   1
_cell_volume   78.899
_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  0.267  0.233  0.233  1.0
  Er  Er1  1  0.733  0.767  0.767  1.0
  B  B2  1  0.500  0.366  0.634  1.0
  B  B3  1  0.500  0.634  0.366  1.0
  B  B4  1  0.000  0.773  0.227  1.0
  B  B5  1  0.000  0.227  0.773  1.0
  C  C6  1  0.000  0.000  0.000  1.0
[/CIF]
.