The compound described by Sr2B2O5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms. In the second Sr site, Sr(2) 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. 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(5) atom. There are five inequivalent O sites. In the first O site, O(5) is bonded in a 2-coordinate geometry to one Sr(2), one B(1), and one B(2) atom. In the second O site, O(1) is bonded in a distorted single-bond geometry to one Sr(1), two equivalent Sr(2), and one B(2) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to one Sr(1), two equivalent Sr(2), and one B(2) atom. In the fourth O site, O(3) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one B(1) atom. In the fifth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one B(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2B2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.348
_cell_length_b   7.761
_cell_length_c   11.882
_cell_angle_alpha   87.002
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   492.468
_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
  Sr  Sr0  1  0.954  0.118  0.132  1.0
  Sr  Sr1  1  0.454  0.882  0.368  1.0
  Sr  Sr2  1  0.046  0.882  0.868  1.0
  Sr  Sr3  1  0.546  0.118  0.632  1.0
  Sr  Sr4  1  0.910  0.624  0.160  1.0
  Sr  Sr5  1  0.410  0.376  0.340  1.0
  Sr  Sr6  1  0.090  0.376  0.840  1.0
  Sr  Sr7  1  0.590  0.624  0.660  1.0
  B  B8  1  0.454  0.840  0.084  1.0
  B  B9  1  0.954  0.160  0.416  1.0
  B  B10  1  0.546  0.160  0.916  1.0
  B  B11  1  0.046  0.840  0.584  1.0
  B  B12  1  0.570  0.660  0.905  1.0
  B  B13  1  0.070  0.340  0.595  1.0
  B  B14  1  0.430  0.340  0.095  1.0
  B  B15  1  0.930  0.660  0.405  1.0
  O  O16  1  0.847  0.357  0.647  1.0
  O  O17  1  0.347  0.643  0.853  1.0
  O  O18  1  0.153  0.643  0.353  1.0
  O  O19  1  0.653  0.357  0.147  1.0
  O  O20  1  0.788  0.606  0.859  1.0
  O  O21  1  0.288  0.394  0.641  1.0
  O  O22  1  0.212  0.394  0.141  1.0
  O  O23  1  0.712  0.606  0.359  1.0
  O  O24  1  0.905  0.902  0.668  1.0
  O  O25  1  0.405  0.098  0.832  1.0
  O  O26  1  0.095  0.098  0.332  1.0
  O  O27  1  0.595  0.902  0.168  1.0
  O  O28  1  0.298  0.854  0.572  1.0
  O  O29  1  0.798  0.146  0.928  1.0
  O  O30  1  0.702  0.146  0.428  1.0
  O  O31  1  0.202  0.854  0.072  1.0
  O  O32  1  0.897  0.749  0.505  1.0
  O  O33  1  0.397  0.251  0.995  1.0
  O  O34  1  0.103  0.251  0.495  1.0
  O  O35  1  0.603  0.749  0.005  1.0
[/CIF]
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The compound described by Sr2B2O5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms. In the second Sr site, Sr(2) 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. 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(5) atom. There are five inequivalent O sites. In the first O site, O(5) is bonded in a 2-coordinate geometry to one Sr(2), one B(1), and one B(2) atom. In the second O site, O(1) is bonded in a distorted single-bond geometry to one Sr(1), two equivalent Sr(2), and one B(2) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to one Sr(1), two equivalent Sr(2), and one B(2) atom. In the fourth O site, O(3) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one B(1) atom. In the fifth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one B(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2B2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.348
_cell_length_b   7.761
_cell_length_c   11.882
_cell_angle_alpha   87.002
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   492.468
_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
  Sr  Sr0  1  0.954  0.118  0.132  1.0
  Sr  Sr1  1  0.454  0.882  0.368  1.0
  Sr  Sr2  1  0.046  0.882  0.868  1.0
  Sr  Sr3  1  0.546  0.118  0.632  1.0
  Sr  Sr4  1  0.910  0.624  0.160  1.0
  Sr  Sr5  1  0.410  0.376  0.340  1.0
  Sr  Sr6  1  0.090  0.376  0.840  1.0
  Sr  Sr7  1  0.590  0.624  0.660  1.0
  B  B8  1  0.454  0.840  0.084  1.0
  B  B9  1  0.954  0.160  0.416  1.0
  B  B10  1  0.546  0.160  0.916  1.0
  B  B11  1  0.046  0.840  0.584  1.0
  B  B12  1  0.570  0.660  0.905  1.0
  B  B13  1  0.070  0.340  0.595  1.0
  B  B14  1  0.430  0.340  0.095  1.0
  B  B15  1  0.930  0.660  0.405  1.0
  O  O16  1  0.847  0.357  0.647  1.0
  O  O17  1  0.347  0.643  0.853  1.0
  O  O18  1  0.153  0.643  0.353  1.0
  O  O19  1  0.653  0.357  0.147  1.0
  O  O20  1  0.788  0.606  0.859  1.0
  O  O21  1  0.288  0.394  0.641  1.0
  O  O22  1  0.212  0.394  0.141  1.0
  O  O23  1  0.712  0.606  0.359  1.0
  O  O24  1  0.905  0.902  0.668  1.0
  O  O25  1  0.405  0.098  0.832  1.0
  O  O26  1  0.095  0.098  0.332  1.0
  O  O27  1  0.595  0.902  0.168  1.0
  O  O28  1  0.298  0.854  0.572  1.0
  O  O29  1  0.798  0.146  0.928  1.0
  O  O30  1  0.702  0.146  0.428  1.0
  O  O31  1  0.202  0.854  0.072  1.0
  O  O32  1  0.897  0.749  0.505  1.0
  O  O33  1  0.397  0.251  0.995  1.0
  O  O34  1  0.103  0.251  0.495  1.0
  O  O35  1  0.603  0.749  0.005  1.0
[/CIF]
.