The crystal structure described by Eu4OBr6 crystallizes in the hexagonal P6_3mc space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 1-coordinate geometry to one O(1), three equivalent Br(2), and four equivalent Br(1) atoms. In the second Eu site, Eu(2) is bonded in a distorted single-bond geometry to one O(1), three equivalent Br(2), and six equivalent Br(1) atoms. O(1) is bonded to one Eu(2) and three equivalent Eu(1) atoms to form OEu4 tetrahedra that share corners with six equivalent Br(2)Eu4 trigonal pyramids and edges with three equivalent Br(2)Eu4 trigonal pyramids. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a 6-coordinate geometry to two equivalent Eu(2) and four equivalent Eu(1) atoms. In the second Br site, Br(2) is bonded to one Eu(2) and three equivalent Eu(1) atoms to form distorted BrEu4 trigonal pyramids that share corners with two equivalent O(1)Eu4 tetrahedra, corners with eight equivalent Br(2)Eu4 trigonal pyramids, and  an edgeedge with one O(1)Eu4 tetrahedra. is represented by the CIF file [CIF]
data_Eu4Br6O
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.819
_cell_length_b   9.819
_cell_length_c   7.505
_cell_angle_alpha   90.001
_cell_angle_beta   89.994
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   626.731
_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
  Eu  Eu0  1  0.401  0.201  0.500  1.0
  Eu  Eu1  1  0.599  0.799  0.000  1.0
  Eu  Eu2  1  0.333  0.667  0.414  1.0
  Eu  Eu3  1  0.201  0.799  0.000  1.0
  Eu  Eu4  1  0.667  0.333  0.914  1.0
  Eu  Eu5  1  0.799  0.599  0.500  1.0
  Eu  Eu6  1  0.799  0.201  0.500  1.0
  Eu  Eu7  1  0.201  0.401  0.000  1.0
  Br  Br8  1  0.534  0.466  0.206  1.0
  Br  Br9  1  0.722  0.861  0.385  1.0
  Br  Br10  1  0.932  0.466  0.206  1.0
  Br  Br11  1  0.139  0.278  0.385  1.0
  Br  Br12  1  0.068  0.534  0.706  1.0
  Br  Br13  1  0.534  0.068  0.206  1.0
  Br  Br14  1  0.278  0.139  0.886  1.0
  Br  Br15  1  0.139  0.861  0.385  1.0
  Br  Br16  1  0.466  0.534  0.706  1.0
  Br  Br17  1  0.466  0.932  0.706  1.0
  Br  Br18  1  0.861  0.139  0.886  1.0
  Br  Br19  1  0.861  0.722  0.885  1.0
  O  O20  1  0.333  0.667  0.101  1.0
  O  O21  1  0.667  0.333  0.601  1.0
[/CIF]
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The crystal structure described by Eu4OBr6 crystallizes in the hexagonal P6_3mc space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 1-coordinate geometry to one O(1), three equivalent Br(2), and four equivalent Br(1) atoms. In the second Eu site, Eu(2) is bonded in a distorted single-bond geometry to one O(1), three equivalent Br(2), and six equivalent Br(1) atoms. O(1) is bonded to one Eu(2) and three equivalent Eu(1) atoms to form OEu4 tetrahedra that share corners with six equivalent Br(2)Eu4 trigonal pyramids and edges with three equivalent Br(2)Eu4 trigonal pyramids. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a 6-coordinate geometry to two equivalent Eu(2) and four equivalent Eu(1) atoms. In the second Br site, Br(2) is bonded to one Eu(2) and three equivalent Eu(1) atoms to form distorted BrEu4 trigonal pyramids that share corners with two equivalent O(1)Eu4 tetrahedra, corners with eight equivalent Br(2)Eu4 trigonal pyramids, and  an edgeedge with one O(1)Eu4 tetrahedra. is represented by the CIF file [CIF]
data_Eu4Br6O
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.819
_cell_length_b   9.819
_cell_length_c   7.505
_cell_angle_alpha   90.001
_cell_angle_beta   89.994
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   626.731
_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
  Eu  Eu0  1  0.401  0.201  0.500  1.0
  Eu  Eu1  1  0.599  0.799  0.000  1.0
  Eu  Eu2  1  0.333  0.667  0.414  1.0
  Eu  Eu3  1  0.201  0.799  0.000  1.0
  Eu  Eu4  1  0.667  0.333  0.914  1.0
  Eu  Eu5  1  0.799  0.599  0.500  1.0
  Eu  Eu6  1  0.799  0.201  0.500  1.0
  Eu  Eu7  1  0.201  0.401  0.000  1.0
  Br  Br8  1  0.534  0.466  0.206  1.0
  Br  Br9  1  0.722  0.861  0.385  1.0
  Br  Br10  1  0.932  0.466  0.206  1.0
  Br  Br11  1  0.139  0.278  0.385  1.0
  Br  Br12  1  0.068  0.534  0.706  1.0
  Br  Br13  1  0.534  0.068  0.206  1.0
  Br  Br14  1  0.278  0.139  0.886  1.0
  Br  Br15  1  0.139  0.861  0.385  1.0
  Br  Br16  1  0.466  0.534  0.706  1.0
  Br  Br17  1  0.466  0.932  0.706  1.0
  Br  Br18  1  0.861  0.139  0.886  1.0
  Br  Br19  1  0.861  0.722  0.885  1.0
  O  O20  1  0.333  0.667  0.101  1.0
  O  O21  1  0.667  0.333  0.601  1.0
[/CIF]
.