The material structure described by NH4H2PO4 crystallizes in the orthorhombic P2_12_12_1 space group. The structure consists of four ammonium molecules inside a H2PO4 framework. In the H2PO4 framework, 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 two inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(2) and one O(3) atom. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(1) and one O(2) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one P(1) and one H(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one P(1), one H(1), and one H(2) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one P(1) and one H(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one P(1) atom. is represented by the CIF file [CIF]
data_PH6NO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.168
_cell_length_b   7.944
_cell_length_c   8.568
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   487.960
_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
  P  P0  1  0.153  0.217  0.694  1.0
  P  P1  1  0.653  0.283  0.306  1.0
  P  P2  1  0.347  0.783  0.194  1.0
  P  P3  1  0.847  0.717  0.806  1.0
  H  H4  1  0.061  0.439  0.846  1.0
  H  H5  1  0.561  0.061  0.154  1.0
  H  H6  1  0.439  0.561  0.346  1.0
  H  H7  1  0.939  0.939  0.654  1.0
  H  H8  1  0.319  0.348  0.508  1.0
  H  H9  1  0.819  0.152  0.492  1.0
  H  H10  1  0.181  0.652  0.008  1.0
  H  H11  1  0.681  0.848  0.992  1.0
  H  H12  1  0.655  0.233  0.937  1.0
  H  H13  1  0.155  0.267  0.063  1.0
  H  H14  1  0.845  0.767  0.437  1.0
  H  H15  1  0.345  0.733  0.563  1.0
  H  H16  1  0.528  0.199  0.774  1.0
  H  H17  1  0.233  0.695  0.734  1.0
  H  H18  1  0.972  0.801  0.274  1.0
  H  H19  1  0.472  0.699  0.726  1.0
  H  H20  1  0.660  0.382  0.795  1.0
  H  H21  1  0.160  0.118  0.205  1.0
  H  H22  1  0.840  0.618  0.295  1.0
  H  H23  1  0.340  0.882  0.705  1.0
  H  H24  1  0.767  0.195  0.766  1.0
  H  H25  1  0.267  0.305  0.234  1.0
  H  H26  1  0.733  0.805  0.266  1.0
  H  H27  1  0.028  0.301  0.226  1.0
  N  N28  1  0.348  0.752  0.683  1.0
  N  N29  1  0.152  0.248  0.183  1.0
  N  N30  1  0.652  0.252  0.817  1.0
  N  N31  1  0.848  0.748  0.317  1.0
  O  O32  1  0.708  0.135  0.421  1.0
  O  O33  1  0.476  0.372  0.367  1.0
  O  O34  1  0.524  0.872  0.133  1.0
  O  O35  1  0.024  0.628  0.867  1.0
  O  O36  1  0.208  0.365  0.579  1.0
  O  O37  1  0.976  0.128  0.633  1.0
  O  O38  1  0.292  0.635  0.079  1.0
  O  O39  1  0.792  0.865  0.921  1.0
  O  O40  1  0.903  0.814  0.649  1.0
  O  O41  1  0.815  0.400  0.273  1.0
  O  O42  1  0.315  0.100  0.727  1.0
  O  O43  1  0.685  0.600  0.773  1.0
  O  O44  1  0.403  0.686  0.351  1.0
  O  O45  1  0.597  0.186  0.149  1.0
  O  O46  1  0.097  0.314  0.851  1.0
  O  O47  1  0.185  0.900  0.227  1.0
[/CIF]
.
The material structure described by NH4H2PO4 crystallizes in the orthorhombic P2_12_12_1 space group. The structure consists of four ammonium molecules inside a H2PO4 framework. In the H2PO4 framework, 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 two inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(2) and one O(3) atom. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(1) and one O(2) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one P(1) and one H(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one P(1), one H(1), and one H(2) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one P(1) and one H(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one P(1) atom. is represented by the CIF file [CIF]
data_PH6NO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.168
_cell_length_b   7.944
_cell_length_c   8.568
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   487.960
_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
  P  P0  1  0.153  0.217  0.694  1.0
  P  P1  1  0.653  0.283  0.306  1.0
  P  P2  1  0.347  0.783  0.194  1.0
  P  P3  1  0.847  0.717  0.806  1.0
  H  H4  1  0.061  0.439  0.846  1.0
  H  H5  1  0.561  0.061  0.154  1.0
  H  H6  1  0.439  0.561  0.346  1.0
  H  H7  1  0.939  0.939  0.654  1.0
  H  H8  1  0.319  0.348  0.508  1.0
  H  H9  1  0.819  0.152  0.492  1.0
  H  H10  1  0.181  0.652  0.008  1.0
  H  H11  1  0.681  0.848  0.992  1.0
  H  H12  1  0.655  0.233  0.937  1.0
  H  H13  1  0.155  0.267  0.063  1.0
  H  H14  1  0.845  0.767  0.437  1.0
  H  H15  1  0.345  0.733  0.563  1.0
  H  H16  1  0.528  0.199  0.774  1.0
  H  H17  1  0.233  0.695  0.734  1.0
  H  H18  1  0.972  0.801  0.274  1.0
  H  H19  1  0.472  0.699  0.726  1.0
  H  H20  1  0.660  0.382  0.795  1.0
  H  H21  1  0.160  0.118  0.205  1.0
  H  H22  1  0.840  0.618  0.295  1.0
  H  H23  1  0.340  0.882  0.705  1.0
  H  H24  1  0.767  0.195  0.766  1.0
  H  H25  1  0.267  0.305  0.234  1.0
  H  H26  1  0.733  0.805  0.266  1.0
  H  H27  1  0.028  0.301  0.226  1.0
  N  N28  1  0.348  0.752  0.683  1.0
  N  N29  1  0.152  0.248  0.183  1.0
  N  N30  1  0.652  0.252  0.817  1.0
  N  N31  1  0.848  0.748  0.317  1.0
  O  O32  1  0.708  0.135  0.421  1.0
  O  O33  1  0.476  0.372  0.367  1.0
  O  O34  1  0.524  0.872  0.133  1.0
  O  O35  1  0.024  0.628  0.867  1.0
  O  O36  1  0.208  0.365  0.579  1.0
  O  O37  1  0.976  0.128  0.633  1.0
  O  O38  1  0.292  0.635  0.079  1.0
  O  O39  1  0.792  0.865  0.921  1.0
  O  O40  1  0.903  0.814  0.649  1.0
  O  O41  1  0.815  0.400  0.273  1.0
  O  O42  1  0.315  0.100  0.727  1.0
  O  O43  1  0.685  0.600  0.773  1.0
  O  O44  1  0.403  0.686  0.351  1.0
  O  O45  1  0.597  0.186  0.149  1.0
  O  O46  1  0.097  0.314  0.851  1.0
  O  O47  1  0.185  0.900  0.227  1.0
[/CIF]
.