The material structure described by Cs2SeO4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 10-coordinate geometry to one O(1), three equivalent O(3), and six equivalent O(2) atoms. In the second Cs site, Cs(2) is bonded in a 9-coordinate geometry to two equivalent O(3), three equivalent O(1), and four equivalent O(2) atoms. Se(1) is bonded in a tetrahedral geometry to one O(1), one O(3), and two equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cs(1), three equivalent Cs(2), and one Se(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Cs(2), three equivalent Cs(1), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Cs(2), three equivalent Cs(1), and one Se(1) atom. is represented by the CIF file [CIF]
data_Cs2SeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.448
_cell_length_b   8.390
_cell_length_c   11.284
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   610.536
_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
  Cs  Cs0  1  0.750  0.674  0.410  1.0
  Cs  Cs1  1  0.750  0.490  0.796  1.0
  Cs  Cs2  1  0.250  0.510  0.204  1.0
  Cs  Cs3  1  0.250  0.010  0.296  1.0
  Cs  Cs4  1  0.750  0.990  0.704  1.0
  Cs  Cs5  1  0.250  0.326  0.590  1.0
  Cs  Cs6  1  0.750  0.174  0.090  1.0
  Cs  Cs7  1  0.250  0.826  0.910  1.0
  Se  Se8  1  0.250  0.766  0.581  1.0
  Se  Se9  1  0.750  0.234  0.419  1.0
  Se  Se10  1  0.750  0.734  0.081  1.0
  Se  Se11  1  0.250  0.266  0.919  1.0
  O  O12  1  0.750  0.037  0.417  1.0
  O  O13  1  0.040  0.197  0.851  1.0
  O  O14  1  0.460  0.697  0.649  1.0
  O  O15  1  0.250  0.199  0.058  1.0
  O  O16  1  0.750  0.537  0.083  1.0
  O  O17  1  0.960  0.303  0.351  1.0
  O  O18  1  0.540  0.303  0.351  1.0
  O  O19  1  0.540  0.803  0.149  1.0
  O  O20  1  0.750  0.801  0.942  1.0
  O  O21  1  0.040  0.697  0.649  1.0
  O  O22  1  0.460  0.197  0.851  1.0
  O  O23  1  0.250  0.699  0.442  1.0
  O  O24  1  0.250  0.463  0.917  1.0
  O  O25  1  0.750  0.301  0.558  1.0
  O  O26  1  0.960  0.803  0.149  1.0
  O  O27  1  0.250  0.963  0.583  1.0
[/CIF]
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The material structure described by Cs2SeO4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 10-coordinate geometry to one O(1), three equivalent O(3), and six equivalent O(2) atoms. In the second Cs site, Cs(2) is bonded in a 9-coordinate geometry to two equivalent O(3), three equivalent O(1), and four equivalent O(2) atoms. Se(1) is bonded in a tetrahedral geometry to one O(1), one O(3), and two equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cs(1), three equivalent Cs(2), and one Se(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Cs(2), three equivalent Cs(1), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Cs(2), three equivalent Cs(1), and one Se(1) atom. is represented by the CIF file [CIF]
data_Cs2SeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.448
_cell_length_b   8.390
_cell_length_c   11.284
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   610.536
_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
  Cs  Cs0  1  0.750  0.674  0.410  1.0
  Cs  Cs1  1  0.750  0.490  0.796  1.0
  Cs  Cs2  1  0.250  0.510  0.204  1.0
  Cs  Cs3  1  0.250  0.010  0.296  1.0
  Cs  Cs4  1  0.750  0.990  0.704  1.0
  Cs  Cs5  1  0.250  0.326  0.590  1.0
  Cs  Cs6  1  0.750  0.174  0.090  1.0
  Cs  Cs7  1  0.250  0.826  0.910  1.0
  Se  Se8  1  0.250  0.766  0.581  1.0
  Se  Se9  1  0.750  0.234  0.419  1.0
  Se  Se10  1  0.750  0.734  0.081  1.0
  Se  Se11  1  0.250  0.266  0.919  1.0
  O  O12  1  0.750  0.037  0.417  1.0
  O  O13  1  0.040  0.197  0.851  1.0
  O  O14  1  0.460  0.697  0.649  1.0
  O  O15  1  0.250  0.199  0.058  1.0
  O  O16  1  0.750  0.537  0.083  1.0
  O  O17  1  0.960  0.303  0.351  1.0
  O  O18  1  0.540  0.303  0.351  1.0
  O  O19  1  0.540  0.803  0.149  1.0
  O  O20  1  0.750  0.801  0.942  1.0
  O  O21  1  0.040  0.697  0.649  1.0
  O  O22  1  0.460  0.197  0.851  1.0
  O  O23  1  0.250  0.699  0.442  1.0
  O  O24  1  0.250  0.463  0.917  1.0
  O  O25  1  0.750  0.301  0.558  1.0
  O  O26  1  0.960  0.803  0.149  1.0
  O  O27  1  0.250  0.963  0.583  1.0
[/CIF]
.