The crystal structure described by K2SeO4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(2), and four equivalent O(3) atoms. In the second K site, K(2) is bonded in a 10-coordinate geometry to one O(1), three equivalent O(2), and six equivalent O(3) atoms. Se(1) is bonded in a tetrahedral geometry to one O(1), one O(2), and two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one Se(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent K(1), three equivalent K(2), and one Se(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to two equivalent K(1), three equivalent K(2), and one Se(1) atom. is represented by the CIF card [CIF]
data_K2SeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.969
_cell_length_b   7.620
_cell_length_c   10.411
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   473.501
_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
  K  K0  1  0.250  0.002  0.294  1.0
  K  K1  1  0.750  0.998  0.706  1.0
  K  K2  1  0.250  0.502  0.206  1.0
  K  K3  1  0.750  0.498  0.794  1.0
  K  K4  1  0.250  0.836  0.920  1.0
  K  K5  1  0.750  0.164  0.080  1.0
  K  K6  1  0.250  0.336  0.580  1.0
  K  K7  1  0.750  0.664  0.420  1.0
  Se  Se8  1  0.250  0.779  0.581  1.0
  Se  Se9  1  0.750  0.221  0.419  1.0
  Se  Se10  1  0.250  0.279  0.919  1.0
  Se  Se11  1  0.750  0.721  0.081  1.0
  O  O12  1  0.250  0.994  0.571  1.0
  O  O13  1  0.750  0.006  0.429  1.0
  O  O14  1  0.250  0.494  0.929  1.0
  O  O15  1  0.750  0.506  0.071  1.0
  O  O16  1  0.250  0.687  0.436  1.0
  O  O17  1  0.750  0.313  0.564  1.0
  O  O18  1  0.250  0.187  0.064  1.0
  O  O19  1  0.750  0.813  0.936  1.0
  O  O20  1  0.524  0.290  0.341  1.0
  O  O21  1  0.024  0.710  0.659  1.0
  O  O22  1  0.976  0.790  0.159  1.0
  O  O23  1  0.476  0.210  0.841  1.0
  O  O24  1  0.524  0.790  0.159  1.0
  O  O25  1  0.024  0.210  0.841  1.0
  O  O26  1  0.976  0.290  0.341  1.0
  O  O27  1  0.476  0.710  0.659  1.0
[/CIF]
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The crystal structure described by K2SeO4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(2), and four equivalent O(3) atoms. In the second K site, K(2) is bonded in a 10-coordinate geometry to one O(1), three equivalent O(2), and six equivalent O(3) atoms. Se(1) is bonded in a tetrahedral geometry to one O(1), one O(2), and two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one Se(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent K(1), three equivalent K(2), and one Se(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to two equivalent K(1), three equivalent K(2), and one Se(1) atom. is represented by the CIF card [CIF]
data_K2SeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.969
_cell_length_b   7.620
_cell_length_c   10.411
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   473.501
_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
  K  K0  1  0.250  0.002  0.294  1.0
  K  K1  1  0.750  0.998  0.706  1.0
  K  K2  1  0.250  0.502  0.206  1.0
  K  K3  1  0.750  0.498  0.794  1.0
  K  K4  1  0.250  0.836  0.920  1.0
  K  K5  1  0.750  0.164  0.080  1.0
  K  K6  1  0.250  0.336  0.580  1.0
  K  K7  1  0.750  0.664  0.420  1.0
  Se  Se8  1  0.250  0.779  0.581  1.0
  Se  Se9  1  0.750  0.221  0.419  1.0
  Se  Se10  1  0.250  0.279  0.919  1.0
  Se  Se11  1  0.750  0.721  0.081  1.0
  O  O12  1  0.250  0.994  0.571  1.0
  O  O13  1  0.750  0.006  0.429  1.0
  O  O14  1  0.250  0.494  0.929  1.0
  O  O15  1  0.750  0.506  0.071  1.0
  O  O16  1  0.250  0.687  0.436  1.0
  O  O17  1  0.750  0.313  0.564  1.0
  O  O18  1  0.250  0.187  0.064  1.0
  O  O19  1  0.750  0.813  0.936  1.0
  O  O20  1  0.524  0.290  0.341  1.0
  O  O21  1  0.024  0.710  0.659  1.0
  O  O22  1  0.976  0.790  0.159  1.0
  O  O23  1  0.476  0.210  0.841  1.0
  O  O24  1  0.524  0.790  0.159  1.0
  O  O25  1  0.024  0.210  0.841  1.0
  O  O26  1  0.976  0.290  0.341  1.0
  O  O27  1  0.476  0.710  0.659  1.0
[/CIF]
.