The material described by K2CrO4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to one O(3), three equivalent O(2), and six equivalent O(1) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to two equivalent O(2), three equivalent O(3), and four equivalent O(1) atoms. Cr(1) is bonded in a tetrahedral geometry to one O(2), one O(3), and two equivalent O(1) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(2), three equivalent K(1), and one Cr(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(2), three equivalent K(1), and one Cr(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one Cr(1) atom. is represented by the CIF file [CIF]
data_K2CrO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.868
_cell_length_b   7.632
_cell_length_c   10.328
_cell_angle_alpha   89.999
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   462.593
_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  0.750  0.663  0.918  1.0
  K  K1  1  0.250  0.337  0.082  1.0
  K  K2  1  0.750  0.163  0.582  1.0
  K  K3  1  0.250  0.837  0.418  1.0
  K  K4  1  0.250  0.009  0.803  1.0
  K  K5  1  0.750  0.991  0.197  1.0
  K  K6  1  0.250  0.509  0.697  1.0
  K  K7  1  0.750  0.491  0.303  1.0
  Cr  Cr8  1  0.750  0.228  0.919  1.0
  Cr  Cr9  1  0.250  0.772  0.081  1.0
  Cr  Cr10  1  0.750  0.728  0.581  1.0
  Cr  Cr11  1  0.250  0.272  0.419  1.0
  O  O12  1  0.979  0.801  0.656  1.0
  O  O13  1  0.479  0.199  0.344  1.0
  O  O14  1  0.521  0.301  0.844  1.0
  O  O15  1  0.021  0.699  0.156  1.0
  O  O16  1  0.021  0.199  0.344  1.0
  O  O17  1  0.521  0.801  0.656  1.0
  O  O18  1  0.479  0.699  0.156  1.0
  O  O19  1  0.979  0.301  0.844  1.0
  O  O20  1  0.250  0.194  0.569  1.0
  O  O21  1  0.750  0.806  0.431  1.0
  O  O22  1  0.250  0.694  0.931  1.0
  O  O23  1  0.750  0.306  0.069  1.0
  O  O24  1  0.750  0.013  0.921  1.0
  O  O25  1  0.250  0.987  0.079  1.0
  O  O26  1  0.750  0.513  0.579  1.0
  O  O27  1  0.250  0.487  0.421  1.0
[/CIF]
.
The material described by K2CrO4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to one O(3), three equivalent O(2), and six equivalent O(1) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to two equivalent O(2), three equivalent O(3), and four equivalent O(1) atoms. Cr(1) is bonded in a tetrahedral geometry to one O(2), one O(3), and two equivalent O(1) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(2), three equivalent K(1), and one Cr(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(2), three equivalent K(1), and one Cr(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), and one Cr(1) atom. is represented by the CIF file [CIF]
data_K2CrO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.868
_cell_length_b   7.632
_cell_length_c   10.328
_cell_angle_alpha   89.999
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   462.593
_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  0.750  0.663  0.918  1.0
  K  K1  1  0.250  0.337  0.082  1.0
  K  K2  1  0.750  0.163  0.582  1.0
  K  K3  1  0.250  0.837  0.418  1.0
  K  K4  1  0.250  0.009  0.803  1.0
  K  K5  1  0.750  0.991  0.197  1.0
  K  K6  1  0.250  0.509  0.697  1.0
  K  K7  1  0.750  0.491  0.303  1.0
  Cr  Cr8  1  0.750  0.228  0.919  1.0
  Cr  Cr9  1  0.250  0.772  0.081  1.0
  Cr  Cr10  1  0.750  0.728  0.581  1.0
  Cr  Cr11  1  0.250  0.272  0.419  1.0
  O  O12  1  0.979  0.801  0.656  1.0
  O  O13  1  0.479  0.199  0.344  1.0
  O  O14  1  0.521  0.301  0.844  1.0
  O  O15  1  0.021  0.699  0.156  1.0
  O  O16  1  0.021  0.199  0.344  1.0
  O  O17  1  0.521  0.801  0.656  1.0
  O  O18  1  0.479  0.699  0.156  1.0
  O  O19  1  0.979  0.301  0.844  1.0
  O  O20  1  0.250  0.194  0.569  1.0
  O  O21  1  0.750  0.806  0.431  1.0
  O  O22  1  0.250  0.694  0.931  1.0
  O  O23  1  0.750  0.306  0.069  1.0
  O  O24  1  0.750  0.013  0.921  1.0
  O  O25  1  0.250  0.987  0.079  1.0
  O  O26  1  0.750  0.513  0.579  1.0
  O  O27  1  0.250  0.487  0.421  1.0
[/CIF]
.