The compound described by Sr2Be2B2O7 crystallizes in the hexagonal P-6c2 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to six equivalent O(1) atoms to form distorted SrO6 pentagonal pyramids that share corners with six equivalent Be(1)O4 tetrahedra. In the second Sr site, Sr(2) is bonded in a distorted q6 geometry to three equivalent O(2) and six equivalent O(1) atoms. Be(1) is bonded to one O(2) and three equivalent O(1) atoms to form BeO4 tetrahedra that share corners with three equivalent Sr(1)O6 pentagonal pyramids and  a cornercorner with one Be(1)O4 tetrahedra. B(1) is bonded in a trigonal planar geometry to three equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(2), one Be(1), and one B(1) atom. In the second O site, O(2) is bonded in a linear geometry to three equivalent Sr(2) and two equivalent Be(1) atoms. is represented by the CIF file [CIF]
data_Sr2Be2B2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.730
_cell_length_b   4.730
_cell_length_c   15.592
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   302.138
_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
  Sr  Sr0  1  0.000  0.000  0.250  1.0
  Sr  Sr1  1  0.000  0.000  0.500  1.0
  Sr  Sr2  1  0.000  0.000  0.000  1.0
  Sr  Sr3  1  0.000  0.000  0.750  1.0
  Be  Be4  1  0.333  0.667  0.601  1.0
  Be  Be5  1  0.333  0.667  0.399  1.0
  Be  Be6  1  0.333  0.667  0.101  1.0
  Be  Be7  1  0.333  0.667  0.899  1.0
  B  B8  1  0.667  0.333  0.136  1.0
  B  B9  1  0.667  0.333  0.364  1.0
  B  B10  1  0.667  0.333  0.864  1.0
  B  B11  1  0.667  0.333  0.636  1.0
  O  O12  1  0.976  0.369  0.637  1.0
  O  O13  1  0.393  0.024  0.637  1.0
  O  O14  1  0.631  0.607  0.637  1.0
  O  O15  1  0.976  0.607  0.363  1.0
  O  O16  1  0.393  0.369  0.363  1.0
  O  O17  1  0.631  0.607  0.863  1.0
  O  O18  1  0.631  0.024  0.137  1.0
  O  O19  1  0.393  0.024  0.863  1.0
  O  O20  1  0.631  0.024  0.363  1.0
  O  O21  1  0.333  0.667  0.500  1.0
  O  O22  1  0.393  0.369  0.137  1.0
  O  O23  1  0.976  0.607  0.137  1.0
  O  O24  1  0.976  0.369  0.863  1.0
  O  O25  1  0.333  0.667  0.000  1.0
[/CIF]
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The compound described by Sr2Be2B2O7 crystallizes in the hexagonal P-6c2 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to six equivalent O(1) atoms to form distorted SrO6 pentagonal pyramids that share corners with six equivalent Be(1)O4 tetrahedra. In the second Sr site, Sr(2) is bonded in a distorted q6 geometry to three equivalent O(2) and six equivalent O(1) atoms. Be(1) is bonded to one O(2) and three equivalent O(1) atoms to form BeO4 tetrahedra that share corners with three equivalent Sr(1)O6 pentagonal pyramids and  a cornercorner with one Be(1)O4 tetrahedra. B(1) is bonded in a trigonal planar geometry to three equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(2), one Be(1), and one B(1) atom. In the second O site, O(2) is bonded in a linear geometry to three equivalent Sr(2) and two equivalent Be(1) atoms. is represented by the CIF file [CIF]
data_Sr2Be2B2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.730
_cell_length_b   4.730
_cell_length_c   15.592
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   302.138
_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
  Sr  Sr0  1  0.000  0.000  0.250  1.0
  Sr  Sr1  1  0.000  0.000  0.500  1.0
  Sr  Sr2  1  0.000  0.000  0.000  1.0
  Sr  Sr3  1  0.000  0.000  0.750  1.0
  Be  Be4  1  0.333  0.667  0.601  1.0
  Be  Be5  1  0.333  0.667  0.399  1.0
  Be  Be6  1  0.333  0.667  0.101  1.0
  Be  Be7  1  0.333  0.667  0.899  1.0
  B  B8  1  0.667  0.333  0.136  1.0
  B  B9  1  0.667  0.333  0.364  1.0
  B  B10  1  0.667  0.333  0.864  1.0
  B  B11  1  0.667  0.333  0.636  1.0
  O  O12  1  0.976  0.369  0.637  1.0
  O  O13  1  0.393  0.024  0.637  1.0
  O  O14  1  0.631  0.607  0.637  1.0
  O  O15  1  0.976  0.607  0.363  1.0
  O  O16  1  0.393  0.369  0.363  1.0
  O  O17  1  0.631  0.607  0.863  1.0
  O  O18  1  0.631  0.024  0.137  1.0
  O  O19  1  0.393  0.024  0.863  1.0
  O  O20  1  0.631  0.024  0.363  1.0
  O  O21  1  0.333  0.667  0.500  1.0
  O  O22  1  0.393  0.369  0.137  1.0
  O  O23  1  0.976  0.607  0.137  1.0
  O  O24  1  0.976  0.369  0.863  1.0
  O  O25  1  0.333  0.667  0.000  1.0
[/CIF]
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