The structure described by EuIBr crystallizes in the orthorhombic Pnma space group. Eu(1) is bonded in a 9-coordinate geometry to five equivalent I(1) and four equivalent Br(1) atoms. I(1) is bonded to five equivalent Eu(1) atoms to form distorted IEu5 trigonal bipyramids that share corners with eight equivalent Br(1)Eu4 tetrahedra, corners with eight equivalent I(1)Eu5 trigonal bipyramids, edges with six equivalent Br(1)Eu4 tetrahedra, and edges with six equivalent I(1)Eu5 trigonal bipyramids. Br(1) is bonded to four equivalent Eu(1) atoms to form BrEu4 tetrahedra that share corners with eight equivalent Br(1)Eu4 tetrahedra, corners with eight equivalent I(1)Eu5 trigonal bipyramids, edges with two equivalent Br(1)Eu4 tetrahedra, and edges with six equivalent I(1)Eu5 trigonal bipyramids. is represented by the CIF file [CIF]
data_EuIBr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.793
_cell_length_b   8.428
_cell_length_c   9.770
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   394.725
_cell_formula_units_Z   4
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  0.750  0.226  0.872  1.0
  Eu  Eu1  1  0.250  0.774  0.128  1.0
  Eu  Eu2  1  0.750  0.726  0.628  1.0
  Eu  Eu3  1  0.250  0.274  0.372  1.0
  I  I4  1  0.750  0.973  0.333  1.0
  I  I5  1  0.250  0.027  0.667  1.0
  I  I6  1  0.750  0.473  0.167  1.0
  I  I7  1  0.250  0.527  0.833  1.0
  Br  Br8  1  0.250  0.145  0.065  1.0
  Br  Br9  1  0.750  0.855  0.935  1.0
  Br  Br10  1  0.250  0.645  0.435  1.0
  Br  Br11  1  0.750  0.355  0.565  1.0
[/CIF]
.
The structure described by EuIBr crystallizes in the orthorhombic Pnma space group. Eu(1) is bonded in a 9-coordinate geometry to five equivalent I(1) and four equivalent Br(1) atoms. I(1) is bonded to five equivalent Eu(1) atoms to form distorted IEu5 trigonal bipyramids that share corners with eight equivalent Br(1)Eu4 tetrahedra, corners with eight equivalent I(1)Eu5 trigonal bipyramids, edges with six equivalent Br(1)Eu4 tetrahedra, and edges with six equivalent I(1)Eu5 trigonal bipyramids. Br(1) is bonded to four equivalent Eu(1) atoms to form BrEu4 tetrahedra that share corners with eight equivalent Br(1)Eu4 tetrahedra, corners with eight equivalent I(1)Eu5 trigonal bipyramids, edges with two equivalent Br(1)Eu4 tetrahedra, and edges with six equivalent I(1)Eu5 trigonal bipyramids. is represented by the CIF file [CIF]
data_EuIBr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.793
_cell_length_b   8.428
_cell_length_c   9.770
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   394.725
_cell_formula_units_Z   4
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  0.750  0.226  0.872  1.0
  Eu  Eu1  1  0.250  0.774  0.128  1.0
  Eu  Eu2  1  0.750  0.726  0.628  1.0
  Eu  Eu3  1  0.250  0.274  0.372  1.0
  I  I4  1  0.750  0.973  0.333  1.0
  I  I5  1  0.250  0.027  0.667  1.0
  I  I6  1  0.750  0.473  0.167  1.0
  I  I7  1  0.250  0.527  0.833  1.0
  Br  Br8  1  0.250  0.145  0.065  1.0
  Br  Br9  1  0.750  0.855  0.935  1.0
  Br  Br10  1  0.250  0.645  0.435  1.0
  Br  Br11  1  0.750  0.355  0.565  1.0
[/CIF]
.