The structure described by La2Be2O5 crystallizes in the monoclinic C2/c space group. Be(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing BeO4 tetrahedra. La(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(4), and four equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Be(1) and four equivalent La(1) atoms. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent Be(1) and four equivalent La(1) atoms. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Be(1) and four equivalent La(1) atoms. In the fourth O site, O(4) is bonded in a distorted linear geometry to two equivalent Be(1) and four equivalent La(1) atoms. is represented by the CIF file [CIF]
data_La2Be2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.296
_cell_length_b   5.296
_cell_length_c   7.458
_cell_angle_alpha   89.231
_cell_angle_beta   89.231
_cell_angle_gamma   88.377
_symmetry_Int_Tables_number   1
_cell_volume   209.049
_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
  La  La0  1  0.800  0.728  0.694  1.0
  La  La1  1  0.272  0.200  0.806  1.0
  La  La2  1  0.200  0.272  0.306  1.0
  La  La3  1  0.728  0.800  0.194  1.0
  Be  Be4  1  0.688  0.252  0.470  1.0
  Be  Be5  1  0.748  0.312  0.030  1.0
  Be  Be6  1  0.252  0.688  0.970  1.0
  Be  Be7  1  0.312  0.748  0.530  1.0
  O  O8  1  0.753  0.247  0.250  1.0
  O  O9  1  0.247  0.753  0.750  1.0
  O  O10  1  0.500  0.500  0.500  1.0
  O  O11  1  0.500  0.500  0.000  1.0
  O  O12  1  0.744  0.056  0.916  1.0
  O  O13  1  0.944  0.256  0.584  1.0
  O  O14  1  0.256  0.944  0.084  1.0
  O  O15  1  0.056  0.744  0.416  1.0
  O  O16  1  0.500  0.000  0.500  1.0
  O  O17  1  0.000  0.500  0.000  1.0
[/CIF]
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The structure described by La2Be2O5 crystallizes in the monoclinic C2/c space group. Be(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing BeO4 tetrahedra. La(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(4), and four equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Be(1) and four equivalent La(1) atoms. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent Be(1) and four equivalent La(1) atoms. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Be(1) and four equivalent La(1) atoms. In the fourth O site, O(4) is bonded in a distorted linear geometry to two equivalent Be(1) and four equivalent La(1) atoms. is represented by the CIF file [CIF]
data_La2Be2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.296
_cell_length_b   5.296
_cell_length_c   7.458
_cell_angle_alpha   89.231
_cell_angle_beta   89.231
_cell_angle_gamma   88.377
_symmetry_Int_Tables_number   1
_cell_volume   209.049
_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
  La  La0  1  0.800  0.728  0.694  1.0
  La  La1  1  0.272  0.200  0.806  1.0
  La  La2  1  0.200  0.272  0.306  1.0
  La  La3  1  0.728  0.800  0.194  1.0
  Be  Be4  1  0.688  0.252  0.470  1.0
  Be  Be5  1  0.748  0.312  0.030  1.0
  Be  Be6  1  0.252  0.688  0.970  1.0
  Be  Be7  1  0.312  0.748  0.530  1.0
  O  O8  1  0.753  0.247  0.250  1.0
  O  O9  1  0.247  0.753  0.750  1.0
  O  O10  1  0.500  0.500  0.500  1.0
  O  O11  1  0.500  0.500  0.000  1.0
  O  O12  1  0.744  0.056  0.916  1.0
  O  O13  1  0.944  0.256  0.584  1.0
  O  O14  1  0.256  0.944  0.084  1.0
  O  O15  1  0.056  0.744  0.416  1.0
  O  O16  1  0.500  0.000  0.500  1.0
  O  O17  1  0.000  0.500  0.000  1.0
[/CIF]
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