The structure described by Eu3O4Br crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), three equivalent O(3), and two equivalent Br(1) atoms. In the second Eu site, Eu(2) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Eu(1) and two equivalent Eu(2) atoms to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the second O site, O(2) is bonded in a trigonal planar geometry to one Eu(2) and two equivalent Eu(1) atoms. In the third O site, O(3) is bonded to one Eu(2) and three equivalent Eu(1) atoms to form a mixture of distorted corner and edge-sharing OEu4 tetrahedra. Br(1) is bonded in a square co-planar geometry to four equivalent Eu(1) atoms. is represented by the CIF card [CIF]
data_Eu3BrO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.420
_cell_length_b   6.420
_cell_length_c   11.789
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   142.413
_symmetry_Int_Tables_number   1
_cell_volume   296.410
_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  0.823  0.177  0.401  1.0
  Eu  Eu1  1  0.177  0.823  0.599  1.0
  Eu  Eu2  1  0.177  0.823  0.901  1.0
  Eu  Eu3  1  0.823  0.177  0.099  1.0
  Eu  Eu4  1  0.878  0.122  0.750  1.0
  Eu  Eu5  1  0.122  0.878  0.250  1.0
  Br  Br6  1  0.500  0.500  0.000  1.0
  Br  Br7  1  0.500  0.500  0.500  1.0
  O  O8  1  0.301  0.699  0.750  1.0
  O  O9  1  0.699  0.301  0.250  1.0
  O  O10  1  0.065  0.935  0.750  1.0
  O  O11  1  0.935  0.065  0.250  1.0
  O  O12  1  0.767  0.233  0.912  1.0
  O  O13  1  0.233  0.767  0.088  1.0
  O  O14  1  0.233  0.767  0.412  1.0
  O  O15  1  0.767  0.233  0.588  1.0
[/CIF]
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The structure described by Eu3O4Br crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), three equivalent O(3), and two equivalent Br(1) atoms. In the second Eu site, Eu(2) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Eu(1) and two equivalent Eu(2) atoms to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the second O site, O(2) is bonded in a trigonal planar geometry to one Eu(2) and two equivalent Eu(1) atoms. In the third O site, O(3) is bonded to one Eu(2) and three equivalent Eu(1) atoms to form a mixture of distorted corner and edge-sharing OEu4 tetrahedra. Br(1) is bonded in a square co-planar geometry to four equivalent Eu(1) atoms. is represented by the CIF card [CIF]
data_Eu3BrO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.420
_cell_length_b   6.420
_cell_length_c   11.789
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   142.413
_symmetry_Int_Tables_number   1
_cell_volume   296.410
_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  0.823  0.177  0.401  1.0
  Eu  Eu1  1  0.177  0.823  0.599  1.0
  Eu  Eu2  1  0.177  0.823  0.901  1.0
  Eu  Eu3  1  0.823  0.177  0.099  1.0
  Eu  Eu4  1  0.878  0.122  0.750  1.0
  Eu  Eu5  1  0.122  0.878  0.250  1.0
  Br  Br6  1  0.500  0.500  0.000  1.0
  Br  Br7  1  0.500  0.500  0.500  1.0
  O  O8  1  0.301  0.699  0.750  1.0
  O  O9  1  0.699  0.301  0.250  1.0
  O  O10  1  0.065  0.935  0.750  1.0
  O  O11  1  0.935  0.065  0.250  1.0
  O  O12  1  0.767  0.233  0.912  1.0
  O  O13  1  0.233  0.767  0.088  1.0
  O  O14  1  0.233  0.767  0.412  1.0
  O  O15  1  0.767  0.233  0.588  1.0
[/CIF]
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