The structure described by Er8CoGa3 crystallizes in the hexagonal P6_3mc space group. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded to six equivalent Ga(1) atoms to form distorted ErGa6 octahedra that share corners with six equivalent Er(3)Ga3Co tetrahedra, corners with six equivalent Er(2)Ga4Co trigonal pyramids, faces with two equivalent Er(1)Ga6 octahedra, and faces with six equivalent Er(2)Ga4Co trigonal pyramids. In the second Er site, Er(2) is bonded to one Co(1) and four equivalent Ga(1) atoms to form distorted ErGa4Co trigonal pyramids that share corners with two equivalent Er(1)Ga6 octahedra, corners with three equivalent Er(3)Ga3Co tetrahedra, corners with six equivalent Er(2)Ga4Co trigonal pyramids,  an edgeedge with one Er(3)Ga3Co tetrahedra, edges with four equivalent Er(2)Ga4Co trigonal pyramids, and faces with two equivalent Er(1)Ga6 octahedra. The corner-sharing octahedral tilt angles range from 53-58°. In the third Er site, Er(3) is bonded to one Co(1) and three equivalent Ga(1) atoms to form distorted ErGa3Co tetrahedra that share corners with six equivalent Er(1)Ga6 octahedra, corners with nine equivalent Er(2)Ga4Co trigonal pyramids, and edges with three equivalent Er(2)Ga4Co trigonal pyramids. The corner-sharing octahedral tilt angles range from 16-46°. In the fourth Er site, Er(4) is bonded in a 3-coordinate geometry to one Co(1) and four equivalent Ga(1) atoms. Co(1) is bonded in a 7-coordinate geometry to one Er(3), three equivalent Er(2), and three equivalent Er(4) atoms. Ga(1) is bonded in a 11-coordinate geometry to one Er(3), two equivalent Er(1), four equivalent Er(2), and four equivalent Er(4) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er8Ga3Co
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.845
_cell_length_b   9.845
_cell_length_c   6.836
_cell_angle_alpha   90.003
_cell_angle_beta   90.000
_cell_angle_gamma   119.999
_symmetry_Int_Tables_number   1
_cell_volume   573.788
_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  1.000  1.000  0.270  1.0
  Er  Er1  1  1.000  1.000  0.770  1.0
  Er  Er2  1  0.173  0.827  0.991  1.0
  Er  Er3  1  0.827  0.173  0.491  1.0
  Er  Er4  1  0.173  0.346  0.991  1.0
  Er  Er5  1  0.654  0.827  0.991  1.0
  Er  Er6  1  0.346  0.173  0.491  1.0
  Er  Er7  1  0.827  0.654  0.491  1.0
  Er  Er8  1  0.333  0.667  0.672  1.0
  Er  Er9  1  0.667  0.333  0.172  1.0
  Er  Er10  1  0.463  0.537  0.292  1.0
  Er  Er11  1  0.537  0.463  0.792  1.0
  Er  Er12  1  0.463  0.926  0.292  1.0
  Er  Er13  1  0.074  0.537  0.292  1.0
  Er  Er14  1  0.926  0.463  0.792  1.0
  Er  Er15  1  0.537  0.074  0.792  1.0
  Ga  Ga16  1  0.164  0.836  0.542  1.0
  Ga  Ga17  1  0.836  0.164  0.041  1.0
  Ga  Ga18  1  0.164  0.327  0.542  1.0
  Ga  Ga19  1  0.673  0.836  0.542  1.0
  Ga  Ga20  1  0.327  0.164  0.041  1.0
  Ga  Ga21  1  0.836  0.673  0.041  1.0
  Co  Co22  1  0.333  0.667  0.058  1.0
  Co  Co23  1  0.667  0.333  0.558  1.0
[/CIF]
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The structure described by Er8CoGa3 crystallizes in the hexagonal P6_3mc space group. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded to six equivalent Ga(1) atoms to form distorted ErGa6 octahedra that share corners with six equivalent Er(3)Ga3Co tetrahedra, corners with six equivalent Er(2)Ga4Co trigonal pyramids, faces with two equivalent Er(1)Ga6 octahedra, and faces with six equivalent Er(2)Ga4Co trigonal pyramids. In the second Er site, Er(2) is bonded to one Co(1) and four equivalent Ga(1) atoms to form distorted ErGa4Co trigonal pyramids that share corners with two equivalent Er(1)Ga6 octahedra, corners with three equivalent Er(3)Ga3Co tetrahedra, corners with six equivalent Er(2)Ga4Co trigonal pyramids,  an edgeedge with one Er(3)Ga3Co tetrahedra, edges with four equivalent Er(2)Ga4Co trigonal pyramids, and faces with two equivalent Er(1)Ga6 octahedra. The corner-sharing octahedral tilt angles range from 53-58°. In the third Er site, Er(3) is bonded to one Co(1) and three equivalent Ga(1) atoms to form distorted ErGa3Co tetrahedra that share corners with six equivalent Er(1)Ga6 octahedra, corners with nine equivalent Er(2)Ga4Co trigonal pyramids, and edges with three equivalent Er(2)Ga4Co trigonal pyramids. The corner-sharing octahedral tilt angles range from 16-46°. In the fourth Er site, Er(4) is bonded in a 3-coordinate geometry to one Co(1) and four equivalent Ga(1) atoms. Co(1) is bonded in a 7-coordinate geometry to one Er(3), three equivalent Er(2), and three equivalent Er(4) atoms. Ga(1) is bonded in a 11-coordinate geometry to one Er(3), two equivalent Er(1), four equivalent Er(2), and four equivalent Er(4) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er8Ga3Co
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.845
_cell_length_b   9.845
_cell_length_c   6.836
_cell_angle_alpha   90.003
_cell_angle_beta   90.000
_cell_angle_gamma   119.999
_symmetry_Int_Tables_number   1
_cell_volume   573.788
_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  1.000  1.000  0.270  1.0
  Er  Er1  1  1.000  1.000  0.770  1.0
  Er  Er2  1  0.173  0.827  0.991  1.0
  Er  Er3  1  0.827  0.173  0.491  1.0
  Er  Er4  1  0.173  0.346  0.991  1.0
  Er  Er5  1  0.654  0.827  0.991  1.0
  Er  Er6  1  0.346  0.173  0.491  1.0
  Er  Er7  1  0.827  0.654  0.491  1.0
  Er  Er8  1  0.333  0.667  0.672  1.0
  Er  Er9  1  0.667  0.333  0.172  1.0
  Er  Er10  1  0.463  0.537  0.292  1.0
  Er  Er11  1  0.537  0.463  0.792  1.0
  Er  Er12  1  0.463  0.926  0.292  1.0
  Er  Er13  1  0.074  0.537  0.292  1.0
  Er  Er14  1  0.926  0.463  0.792  1.0
  Er  Er15  1  0.537  0.074  0.792  1.0
  Ga  Ga16  1  0.164  0.836  0.542  1.0
  Ga  Ga17  1  0.836  0.164  0.041  1.0
  Ga  Ga18  1  0.164  0.327  0.542  1.0
  Ga  Ga19  1  0.673  0.836  0.542  1.0
  Ga  Ga20  1  0.327  0.164  0.041  1.0
  Ga  Ga21  1  0.836  0.673  0.041  1.0
  Co  Co22  1  0.333  0.667  0.058  1.0
  Co  Co23  1  0.667  0.333  0.558  1.0
[/CIF]
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