The compound described by EuBr2 crystallizes in the tetragonal P4/n space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to four equivalent Br(3) and four equivalent Br(4) atoms. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to one Br(1), one Br(2), three equivalent Br(3), and three equivalent Br(4) atoms. There are four inequivalent Br sites. In the first Br site, Br(1) is bonded to four equivalent Eu(2) atoms to form a mixture of edge and corner-sharing BrEu4 tetrahedra. In the second Br site, Br(2) is bonded to four equivalent Eu(2) atoms to form a mixture of edge and corner-sharing BrEu4 tetrahedra. In the third Br site, Br(3) is bonded to one Eu(1) and three equivalent Eu(2) atoms to form a mixture of edge and corner-sharing BrEu4 trigonal pyramids. In the fourth Br site, Br(4) is bonded in a distorted see-saw-like geometry to one Eu(1) and three equivalent Eu(2) atoms. is represented by the CIF file [CIF]
data_EuBr2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.122
_cell_length_b   11.547
_cell_length_c   11.547
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   949.582
_cell_formula_units_Z   10
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  0.149  0.750  0.750  1.0
  Eu  Eu1  1  0.851  0.250  0.250  1.0
  Eu  Eu2  1  0.752  0.603  0.087  1.0
  Eu  Eu3  1  0.752  0.413  0.603  1.0
  Eu  Eu4  1  0.752  0.087  0.897  1.0
  Eu  Eu5  1  0.752  0.897  0.413  1.0
  Eu  Eu6  1  0.248  0.397  0.913  1.0
  Eu  Eu7  1  0.248  0.587  0.397  1.0
  Eu  Eu8  1  0.248  0.913  0.103  1.0
  Eu  Eu9  1  0.248  0.103  0.587  1.0
  Br  Br10  1  0.500  0.750  0.250  1.0
  Br  Br11  1  0.500  0.250  0.750  1.0
  Br  Br12  1  0.000  0.750  0.250  1.0
  Br  Br13  1  0.000  0.250  0.750  1.0
  Br  Br14  1  0.901  0.839  0.957  1.0
  Br  Br15  1  0.901  0.543  0.839  1.0
  Br  Br16  1  0.901  0.957  0.661  1.0
  Br  Br17  1  0.901  0.661  0.543  1.0
  Br  Br18  1  0.099  0.161  0.043  1.0
  Br  Br19  1  0.099  0.457  0.161  1.0
  Br  Br20  1  0.623  0.153  0.460  1.0
  Br  Br21  1  0.623  0.040  0.153  1.0
  Br  Br22  1  0.623  0.460  0.347  1.0
  Br  Br23  1  0.623  0.347  0.040  1.0
  Br  Br24  1  0.377  0.847  0.540  1.0
  Br  Br25  1  0.377  0.960  0.847  1.0
  Br  Br26  1  0.377  0.540  0.653  1.0
  Br  Br27  1  0.377  0.653  0.960  1.0
  Br  Br28  1  0.099  0.339  0.457  1.0
  Br  Br29  1  0.099  0.043  0.339  1.0
[/CIF]
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The compound described by EuBr2 crystallizes in the tetragonal P4/n space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to four equivalent Br(3) and four equivalent Br(4) atoms. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to one Br(1), one Br(2), three equivalent Br(3), and three equivalent Br(4) atoms. There are four inequivalent Br sites. In the first Br site, Br(1) is bonded to four equivalent Eu(2) atoms to form a mixture of edge and corner-sharing BrEu4 tetrahedra. In the second Br site, Br(2) is bonded to four equivalent Eu(2) atoms to form a mixture of edge and corner-sharing BrEu4 tetrahedra. In the third Br site, Br(3) is bonded to one Eu(1) and three equivalent Eu(2) atoms to form a mixture of edge and corner-sharing BrEu4 trigonal pyramids. In the fourth Br site, Br(4) is bonded in a distorted see-saw-like geometry to one Eu(1) and three equivalent Eu(2) atoms. is represented by the CIF file [CIF]
data_EuBr2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.122
_cell_length_b   11.547
_cell_length_c   11.547
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   949.582
_cell_formula_units_Z   10
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  0.149  0.750  0.750  1.0
  Eu  Eu1  1  0.851  0.250  0.250  1.0
  Eu  Eu2  1  0.752  0.603  0.087  1.0
  Eu  Eu3  1  0.752  0.413  0.603  1.0
  Eu  Eu4  1  0.752  0.087  0.897  1.0
  Eu  Eu5  1  0.752  0.897  0.413  1.0
  Eu  Eu6  1  0.248  0.397  0.913  1.0
  Eu  Eu7  1  0.248  0.587  0.397  1.0
  Eu  Eu8  1  0.248  0.913  0.103  1.0
  Eu  Eu9  1  0.248  0.103  0.587  1.0
  Br  Br10  1  0.500  0.750  0.250  1.0
  Br  Br11  1  0.500  0.250  0.750  1.0
  Br  Br12  1  0.000  0.750  0.250  1.0
  Br  Br13  1  0.000  0.250  0.750  1.0
  Br  Br14  1  0.901  0.839  0.957  1.0
  Br  Br15  1  0.901  0.543  0.839  1.0
  Br  Br16  1  0.901  0.957  0.661  1.0
  Br  Br17  1  0.901  0.661  0.543  1.0
  Br  Br18  1  0.099  0.161  0.043  1.0
  Br  Br19  1  0.099  0.457  0.161  1.0
  Br  Br20  1  0.623  0.153  0.460  1.0
  Br  Br21  1  0.623  0.040  0.153  1.0
  Br  Br22  1  0.623  0.460  0.347  1.0
  Br  Br23  1  0.623  0.347  0.040  1.0
  Br  Br24  1  0.377  0.847  0.540  1.0
  Br  Br25  1  0.377  0.960  0.847  1.0
  Br  Br26  1  0.377  0.540  0.653  1.0
  Br  Br27  1  0.377  0.653  0.960  1.0
  Br  Br28  1  0.099  0.339  0.457  1.0
  Br  Br29  1  0.099  0.043  0.339  1.0
[/CIF]
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