The compound described by K2PO4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(4), three equivalent O(1), and three equivalent O(2) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. P(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four 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 P(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 P(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent K(2), and one P(1) atom. is represented by the CIF file [CIF]
data_K2PO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.384
_cell_length_b   5.977
_cell_length_c   7.491
_cell_angle_alpha   80.875
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   459.072
_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  0.916  0.748  0.828  1.0
  K  K1  1  0.416  0.252  0.672  1.0
  K  K2  1  0.084  0.252  0.172  1.0
  K  K3  1  0.584  0.748  0.328  1.0
  K  K4  1  0.769  0.237  0.526  1.0
  K  K5  1  0.269  0.763  0.974  1.0
  K  K6  1  0.231  0.763  0.474  1.0
  K  K7  1  0.731  0.237  0.026  1.0
  P  P8  1  0.925  0.721  0.280  1.0
  P  P9  1  0.075  0.279  0.720  1.0
  P  P10  1  0.575  0.721  0.780  1.0
  P  P11  1  0.425  0.279  0.220  1.0
  O  O12  1  0.154  0.458  0.795  1.0
  O  O13  1  0.346  0.458  0.295  1.0
  O  O14  1  0.053  0.775  0.181  1.0
  O  O15  1  0.538  0.610  0.998  1.0
  O  O16  1  0.038  0.390  0.502  1.0
  O  O17  1  0.553  0.225  0.319  1.0
  O  O18  1  0.151  0.073  0.681  1.0
  O  O19  1  0.349  0.073  0.181  1.0
  O  O20  1  0.846  0.542  0.205  1.0
  O  O21  1  0.651  0.927  0.819  1.0
  O  O22  1  0.962  0.610  0.498  1.0
  O  O23  1  0.462  0.390  0.002  1.0
  O  O24  1  0.654  0.542  0.705  1.0
  O  O25  1  0.947  0.225  0.819  1.0
  O  O26  1  0.849  0.927  0.319  1.0
  O  O27  1  0.447  0.775  0.681  1.0
[/CIF]
.
The compound described by K2PO4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(4), three equivalent O(1), and three equivalent O(2) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. P(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four 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 P(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 P(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent K(2), and one P(1) atom. is represented by the CIF file [CIF]
data_K2PO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.384
_cell_length_b   5.977
_cell_length_c   7.491
_cell_angle_alpha   80.875
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   459.072
_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  0.916  0.748  0.828  1.0
  K  K1  1  0.416  0.252  0.672  1.0
  K  K2  1  0.084  0.252  0.172  1.0
  K  K3  1  0.584  0.748  0.328  1.0
  K  K4  1  0.769  0.237  0.526  1.0
  K  K5  1  0.269  0.763  0.974  1.0
  K  K6  1  0.231  0.763  0.474  1.0
  K  K7  1  0.731  0.237  0.026  1.0
  P  P8  1  0.925  0.721  0.280  1.0
  P  P9  1  0.075  0.279  0.720  1.0
  P  P10  1  0.575  0.721  0.780  1.0
  P  P11  1  0.425  0.279  0.220  1.0
  O  O12  1  0.154  0.458  0.795  1.0
  O  O13  1  0.346  0.458  0.295  1.0
  O  O14  1  0.053  0.775  0.181  1.0
  O  O15  1  0.538  0.610  0.998  1.0
  O  O16  1  0.038  0.390  0.502  1.0
  O  O17  1  0.553  0.225  0.319  1.0
  O  O18  1  0.151  0.073  0.681  1.0
  O  O19  1  0.349  0.073  0.181  1.0
  O  O20  1  0.846  0.542  0.205  1.0
  O  O21  1  0.651  0.927  0.819  1.0
  O  O22  1  0.962  0.610  0.498  1.0
  O  O23  1  0.462  0.390  0.002  1.0
  O  O24  1  0.654  0.542  0.705  1.0
  O  O25  1  0.947  0.225  0.819  1.0
  O  O26  1  0.849  0.927  0.319  1.0
  O  O27  1  0.447  0.775  0.681  1.0
[/CIF]
.