The compound described by Eu2B2O5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 7-coordinate geometry to one O(3), one O(4), one O(5), two equivalent O(1), and two equivalent O(2) atoms. In the second Eu site, Eu(2) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), two equivalent O(4), and two equivalent O(5) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(3), one O(4), and one O(5) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. There are five inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to one Eu(1), two equivalent Eu(2), and one B(1) atom. In the second O site, O(1) is bonded in a distorted single-bond geometry to one Eu(2), two equivalent Eu(1), and one B(2) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to one Eu(2), two equivalent Eu(1), and one B(2) atom. In the fourth O site, O(3) is bonded in a 2-coordinate geometry to one Eu(1), one Eu(2), one B(1), and one B(2) atom. In the fifth O site, O(4) is bonded in a distorted single-bond geometry to one Eu(1), two equivalent Eu(2), and one B(1) atom. is represented by the CIF file [CIF]
data_Eu2B2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.320
_cell_length_b   7.692
_cell_length_c   11.848
_cell_angle_alpha   86.496
_cell_angle_beta   90.004
_cell_angle_gamma   90.003
_symmetry_Int_Tables_number   1
_cell_volume   483.936
_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  0.416  0.876  0.839  1.0
  Eu  Eu1  1  0.584  0.124  0.161  1.0
  Eu  Eu2  1  0.916  0.124  0.661  1.0
  Eu  Eu3  1  0.084  0.876  0.339  1.0
  Eu  Eu4  1  0.964  0.617  0.633  1.0
  Eu  Eu5  1  0.036  0.383  0.367  1.0
  Eu  Eu6  1  0.464  0.383  0.867  1.0
  Eu  Eu7  1  0.536  0.617  0.133  1.0
  B  B8  1  0.457  0.340  0.582  1.0
  B  B9  1  0.543  0.660  0.418  1.0
  B  B10  1  0.957  0.660  0.918  1.0
  B  B11  1  0.043  0.340  0.082  1.0
  B  B12  1  0.434  0.840  0.596  1.0
  B  B13  1  0.566  0.160  0.404  1.0
  B  B14  1  0.933  0.160  0.904  1.0
  B  B15  1  0.067  0.840  0.096  1.0
  O  O16  1  0.219  0.894  0.645  1.0
  O  O17  1  0.781  0.106  0.355  1.0
  O  O18  1  0.719  0.106  0.854  1.0
  O  O19  1  0.281  0.894  0.146  1.0
  O  O20  1  0.661  0.857  0.644  1.0
  O  O21  1  0.339  0.143  0.356  1.0
  O  O22  1  0.161  0.143  0.856  1.0
  O  O23  1  0.839  0.857  0.144  1.0
  O  O24  1  0.108  0.752  0.995  1.0
  O  O25  1  0.892  0.248  0.005  1.0
  O  O26  1  0.608  0.248  0.505  1.0
  O  O27  1  0.392  0.752  0.495  1.0
  O  O28  1  0.204  0.353  0.569  1.0
  O  O29  1  0.796  0.647  0.431  1.0
  O  O30  1  0.704  0.647  0.931  1.0
  O  O31  1  0.296  0.353  0.069  1.0
  O  O32  1  0.097  0.595  0.834  1.0
  O  O33  1  0.903  0.405  0.166  1.0
  O  O34  1  0.597  0.405  0.666  1.0
  O  O35  1  0.403  0.595  0.334  1.0
[/CIF]
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The compound described by Eu2B2O5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 7-coordinate geometry to one O(3), one O(4), one O(5), two equivalent O(1), and two equivalent O(2) atoms. In the second Eu site, Eu(2) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), two equivalent O(4), and two equivalent O(5) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(3), one O(4), and one O(5) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. There are five inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to one Eu(1), two equivalent Eu(2), and one B(1) atom. In the second O site, O(1) is bonded in a distorted single-bond geometry to one Eu(2), two equivalent Eu(1), and one B(2) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to one Eu(2), two equivalent Eu(1), and one B(2) atom. In the fourth O site, O(3) is bonded in a 2-coordinate geometry to one Eu(1), one Eu(2), one B(1), and one B(2) atom. In the fifth O site, O(4) is bonded in a distorted single-bond geometry to one Eu(1), two equivalent Eu(2), and one B(1) atom. is represented by the CIF file [CIF]
data_Eu2B2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.320
_cell_length_b   7.692
_cell_length_c   11.848
_cell_angle_alpha   86.496
_cell_angle_beta   90.004
_cell_angle_gamma   90.003
_symmetry_Int_Tables_number   1
_cell_volume   483.936
_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  0.416  0.876  0.839  1.0
  Eu  Eu1  1  0.584  0.124  0.161  1.0
  Eu  Eu2  1  0.916  0.124  0.661  1.0
  Eu  Eu3  1  0.084  0.876  0.339  1.0
  Eu  Eu4  1  0.964  0.617  0.633  1.0
  Eu  Eu5  1  0.036  0.383  0.367  1.0
  Eu  Eu6  1  0.464  0.383  0.867  1.0
  Eu  Eu7  1  0.536  0.617  0.133  1.0
  B  B8  1  0.457  0.340  0.582  1.0
  B  B9  1  0.543  0.660  0.418  1.0
  B  B10  1  0.957  0.660  0.918  1.0
  B  B11  1  0.043  0.340  0.082  1.0
  B  B12  1  0.434  0.840  0.596  1.0
  B  B13  1  0.566  0.160  0.404  1.0
  B  B14  1  0.933  0.160  0.904  1.0
  B  B15  1  0.067  0.840  0.096  1.0
  O  O16  1  0.219  0.894  0.645  1.0
  O  O17  1  0.781  0.106  0.355  1.0
  O  O18  1  0.719  0.106  0.854  1.0
  O  O19  1  0.281  0.894  0.146  1.0
  O  O20  1  0.661  0.857  0.644  1.0
  O  O21  1  0.339  0.143  0.356  1.0
  O  O22  1  0.161  0.143  0.856  1.0
  O  O23  1  0.839  0.857  0.144  1.0
  O  O24  1  0.108  0.752  0.995  1.0
  O  O25  1  0.892  0.248  0.005  1.0
  O  O26  1  0.608  0.248  0.505  1.0
  O  O27  1  0.392  0.752  0.495  1.0
  O  O28  1  0.204  0.353  0.569  1.0
  O  O29  1  0.796  0.647  0.431  1.0
  O  O30  1  0.704  0.647  0.931  1.0
  O  O31  1  0.296  0.353  0.069  1.0
  O  O32  1  0.097  0.595  0.834  1.0
  O  O33  1  0.903  0.405  0.166  1.0
  O  O34  1  0.597  0.405  0.666  1.0
  O  O35  1  0.403  0.595  0.334  1.0
[/CIF]
.