The material structure described by Er2Co7B3 crystallizes in the hexagonal P6/mmm space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a distorted hexagonal planar geometry to six equivalent Co(1) atoms. In the second Er site, Er(2) is bonded in a 20-coordinate geometry to two equivalent Er(3), twelve equivalent Co(3), and six equivalent B(1) atoms. In the third Er site, Er(3) is bonded in a 18-coordinate geometry to one Er(2), six equivalent Co(2), six equivalent Co(3), and six equivalent B(2) atoms. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 9-coordinate geometry to three equivalent Er(1) and six equivalent Co(2) atoms. In the second Co site, Co(2) is bonded in a distorted L-shaped geometry to two equivalent Er(3), two equivalent Co(1), and two equivalent B(2) atoms. In the third Co site, Co(3) is bonded in a distorted square co-planar geometry to two equivalent Er(2), two equivalent Er(3), two equivalent B(1), and two equivalent B(2) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded in a 6-coordinate geometry to three equivalent Er(2) and six equivalent Co(3) atoms. In the second B site, B(2) is bonded in a 6-coordinate geometry to three equivalent Er(3), three equivalent Co(2), and three equivalent Co(3) atoms. is represented by the CIF file [CIF]
data_Er2Co7B3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.995
_cell_length_b   4.995
_cell_length_c   12.784
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   276.210
_cell_formula_units_Z   2
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
  Er  Er1  1  0.000  0.000  0.500  1.0
  Er  Er2  1  0.000  0.000  0.739  1.0
  Er  Er3  1  0.000  0.000  0.261  1.0
  Co  Co4  1  0.667  0.333  0.000  1.0
  Co  Co5  1  0.333  0.667  0.000  1.0
  Co  Co6  1  0.500  0.500  0.845  1.0
  Co  Co7  1  0.500  0.000  0.845  1.0
  Co  Co8  1  0.000  0.500  0.845  1.0
  Co  Co9  1  0.500  0.500  0.155  1.0
  Co  Co10  1  0.500  0.000  0.155  1.0
  Co  Co11  1  0.000  0.500  0.155  1.0
  Co  Co12  1  0.500  0.500  0.616  1.0
  Co  Co13  1  0.500  0.000  0.616  1.0
  Co  Co14  1  0.000  0.500  0.616  1.0
  Co  Co15  1  0.500  0.500  0.384  1.0
  Co  Co16  1  0.500  0.000  0.384  1.0
  Co  Co17  1  0.000  0.500  0.384  1.0
  B  B18  1  0.667  0.333  0.500  1.0
  B  B19  1  0.333  0.667  0.500  1.0
  B  B20  1  0.667  0.333  0.732  1.0
  B  B21  1  0.333  0.667  0.732  1.0
  B  B22  1  0.333  0.667  0.268  1.0
  B  B23  1  0.667  0.333  0.268  1.0
[/CIF]
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The material structure described by Er2Co7B3 crystallizes in the hexagonal P6/mmm space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a distorted hexagonal planar geometry to six equivalent Co(1) atoms. In the second Er site, Er(2) is bonded in a 20-coordinate geometry to two equivalent Er(3), twelve equivalent Co(3), and six equivalent B(1) atoms. In the third Er site, Er(3) is bonded in a 18-coordinate geometry to one Er(2), six equivalent Co(2), six equivalent Co(3), and six equivalent B(2) atoms. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 9-coordinate geometry to three equivalent Er(1) and six equivalent Co(2) atoms. In the second Co site, Co(2) is bonded in a distorted L-shaped geometry to two equivalent Er(3), two equivalent Co(1), and two equivalent B(2) atoms. In the third Co site, Co(3) is bonded in a distorted square co-planar geometry to two equivalent Er(2), two equivalent Er(3), two equivalent B(1), and two equivalent B(2) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded in a 6-coordinate geometry to three equivalent Er(2) and six equivalent Co(3) atoms. In the second B site, B(2) is bonded in a 6-coordinate geometry to three equivalent Er(3), three equivalent Co(2), and three equivalent Co(3) atoms. is represented by the CIF file [CIF]
data_Er2Co7B3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.995
_cell_length_b   4.995
_cell_length_c   12.784
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   276.210
_cell_formula_units_Z   2
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
  Er  Er1  1  0.000  0.000  0.500  1.0
  Er  Er2  1  0.000  0.000  0.739  1.0
  Er  Er3  1  0.000  0.000  0.261  1.0
  Co  Co4  1  0.667  0.333  0.000  1.0
  Co  Co5  1  0.333  0.667  0.000  1.0
  Co  Co6  1  0.500  0.500  0.845  1.0
  Co  Co7  1  0.500  0.000  0.845  1.0
  Co  Co8  1  0.000  0.500  0.845  1.0
  Co  Co9  1  0.500  0.500  0.155  1.0
  Co  Co10  1  0.500  0.000  0.155  1.0
  Co  Co11  1  0.000  0.500  0.155  1.0
  Co  Co12  1  0.500  0.500  0.616  1.0
  Co  Co13  1  0.500  0.000  0.616  1.0
  Co  Co14  1  0.000  0.500  0.616  1.0
  Co  Co15  1  0.500  0.500  0.384  1.0
  Co  Co16  1  0.500  0.000  0.384  1.0
  Co  Co17  1  0.000  0.500  0.384  1.0
  B  B18  1  0.667  0.333  0.500  1.0
  B  B19  1  0.333  0.667  0.500  1.0
  B  B20  1  0.667  0.333  0.732  1.0
  B  B21  1  0.333  0.667  0.732  1.0
  B  B22  1  0.333  0.667  0.268  1.0
  B  B23  1  0.667  0.333  0.268  1.0
[/CIF]
.