The material described by SrSe2O5 crystallizes in the triclinic P-1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(6), one O(7), one O(8), two equivalent O(10), and two equivalent O(9) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(6), one O(8), and one O(9) atom. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(2), and one O(5) atom. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(3), one O(4), and one O(5) atom. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(10), one O(6), and one O(7) atom. In the fourth Se site, Se(4) is bonded in a distorted trigonal non-coplanar geometry to one O(7), one O(8), and one O(9) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Sr(2) and one Se(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), and one Se(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Sr(2) and one Se(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Se(1) and one Se(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Sr(2), and one Se(3) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Sr(1), one Se(3), and one Se(4) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one Se(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Se(4) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Se(3) atom. is represented by the CIF card [CIF]
data_SrSe2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.928
_cell_length_b   6.980
_cell_length_c   10.900
_cell_angle_alpha   85.083
_cell_angle_beta   81.377
_cell_angle_gamma   79.627
_symmetry_Int_Tables_number   1
_cell_volume   511.649
_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  0.195  0.359  0.892  1.0
  Sr  Sr1  1  0.805  0.641  0.108  1.0
  Sr  Sr2  1  0.685  0.609  0.757  1.0
  Sr  Sr3  1  0.315  0.391  0.243  1.0
  Se  Se4  1  0.584  0.166  0.620  1.0
  Se  Se5  1  0.416  0.834  0.380  1.0
  Se  Se6  1  0.126  0.269  0.567  1.0
  Se  Se7  1  0.874  0.731  0.433  1.0
  Se  Se8  1  0.118  0.838  0.786  1.0
  Se  Se9  1  0.882  0.162  0.214  1.0
  Se  Se10  1  0.301  0.841  0.042  1.0
  Se  Se11  1  0.699  0.159  0.958  1.0
  O  O12  1  0.702  0.948  0.662  1.0
  O  O13  1  0.298  0.052  0.338  1.0
  O  O14  1  0.540  0.289  0.751  1.0
  O  O15  1  0.460  0.711  0.249  1.0
  O  O16  1  0.031  0.370  0.701  1.0
  O  O17  1  0.969  0.630  0.299  1.0
  O  O18  1  0.241  0.433  0.480  1.0
  O  O19  1  0.759  0.567  0.520  1.0
  O  O20  1  0.339  0.098  0.623  1.0
  O  O21  1  0.661  0.902  0.377  1.0
  O  O22  1  0.316  0.664  0.765  1.0
  O  O23  1  0.684  0.336  0.235  1.0
  O  O24  1  0.816  0.026  0.095  1.0
  O  O25  1  0.184  0.974  0.905  1.0
  O  O26  1  0.467  0.223  0.027  1.0
  O  O27  1  0.533  0.777  0.973  1.0
  O  O28  1  0.793  0.368  0.946  1.0
  O  O29  1  0.207  0.632  0.054  1.0
  O  O30  1  0.050  0.286  0.131  1.0
  O  O31  1  0.950  0.714  0.869  1.0
[/CIF]
.
The material described by SrSe2O5 crystallizes in the triclinic P-1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(6), one O(7), one O(8), two equivalent O(10), and two equivalent O(9) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(6), one O(8), and one O(9) atom. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(2), and one O(5) atom. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(3), one O(4), and one O(5) atom. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(10), one O(6), and one O(7) atom. In the fourth Se site, Se(4) is bonded in a distorted trigonal non-coplanar geometry to one O(7), one O(8), and one O(9) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Sr(2) and one Se(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), and one Se(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Sr(2) and one Se(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Se(1) and one Se(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Sr(2), and one Se(3) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Sr(1), one Se(3), and one Se(4) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one Se(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Se(4) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Se(3) atom. is represented by the CIF card [CIF]
data_SrSe2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.928
_cell_length_b   6.980
_cell_length_c   10.900
_cell_angle_alpha   85.083
_cell_angle_beta   81.377
_cell_angle_gamma   79.627
_symmetry_Int_Tables_number   1
_cell_volume   511.649
_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  0.195  0.359  0.892  1.0
  Sr  Sr1  1  0.805  0.641  0.108  1.0
  Sr  Sr2  1  0.685  0.609  0.757  1.0
  Sr  Sr3  1  0.315  0.391  0.243  1.0
  Se  Se4  1  0.584  0.166  0.620  1.0
  Se  Se5  1  0.416  0.834  0.380  1.0
  Se  Se6  1  0.126  0.269  0.567  1.0
  Se  Se7  1  0.874  0.731  0.433  1.0
  Se  Se8  1  0.118  0.838  0.786  1.0
  Se  Se9  1  0.882  0.162  0.214  1.0
  Se  Se10  1  0.301  0.841  0.042  1.0
  Se  Se11  1  0.699  0.159  0.958  1.0
  O  O12  1  0.702  0.948  0.662  1.0
  O  O13  1  0.298  0.052  0.338  1.0
  O  O14  1  0.540  0.289  0.751  1.0
  O  O15  1  0.460  0.711  0.249  1.0
  O  O16  1  0.031  0.370  0.701  1.0
  O  O17  1  0.969  0.630  0.299  1.0
  O  O18  1  0.241  0.433  0.480  1.0
  O  O19  1  0.759  0.567  0.520  1.0
  O  O20  1  0.339  0.098  0.623  1.0
  O  O21  1  0.661  0.902  0.377  1.0
  O  O22  1  0.316  0.664  0.765  1.0
  O  O23  1  0.684  0.336  0.235  1.0
  O  O24  1  0.816  0.026  0.095  1.0
  O  O25  1  0.184  0.974  0.905  1.0
  O  O26  1  0.467  0.223  0.027  1.0
  O  O27  1  0.533  0.777  0.973  1.0
  O  O28  1  0.793  0.368  0.946  1.0
  O  O29  1  0.207  0.632  0.054  1.0
  O  O30  1  0.050  0.286  0.131  1.0
  O  O31  1  0.950  0.714  0.869  1.0
[/CIF]
.