The material structure described by KH2AsO4 crystallizes in the orthorhombic Fdd2 space group. K(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. As(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. H(1) is bonded in a linear geometry to one O(1) and one O(2) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent K(1), one As(1), and one H(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent K(1), one As(1), and one H(1) atom. is represented by the CIF file [CIF]
data_KAs(HO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.592
_cell_length_b   6.654
_cell_length_c   6.654
_cell_angle_alpha   66.952
_cell_angle_beta   72.114
_cell_angle_gamma   107.886
_symmetry_Int_Tables_number   1
_cell_volume   223.069
_cell_formula_units_Z   2
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  0.000  0.505  0.495  1.0
  K  K1  1  0.500  0.255  0.245  1.0
  As  As2  1  0.500  0.733  0.767  1.0
  As  As3  1  0.000  0.983  0.017  1.0
  H  H4  1  0.438  0.027  0.844  1.0
  H  H5  1  0.562  0.717  0.412  1.0
  H  H6  1  0.062  0.338  0.033  1.0
  H  H7  1  0.938  0.906  0.723  1.0
  O  O8  1  0.574  0.038  0.701  1.0
  O  O9  1  0.253  0.022  0.050  1.0
  O  O10  1  0.426  0.725  0.536  1.0
  O  O11  1  0.747  0.697  0.230  1.0
  O  O12  1  0.753  0.700  0.728  1.0
  O  O13  1  0.926  0.214  0.025  1.0
  O  O14  1  0.247  0.520  0.053  1.0
  O  O15  1  0.074  0.049  0.712  1.0
[/CIF]
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The material structure described by KH2AsO4 crystallizes in the orthorhombic Fdd2 space group. K(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. As(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. H(1) is bonded in a linear geometry to one O(1) and one O(2) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent K(1), one As(1), and one H(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent K(1), one As(1), and one H(1) atom. is represented by the CIF file [CIF]
data_KAs(HO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.592
_cell_length_b   6.654
_cell_length_c   6.654
_cell_angle_alpha   66.952
_cell_angle_beta   72.114
_cell_angle_gamma   107.886
_symmetry_Int_Tables_number   1
_cell_volume   223.069
_cell_formula_units_Z   2
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  0.000  0.505  0.495  1.0
  K  K1  1  0.500  0.255  0.245  1.0
  As  As2  1  0.500  0.733  0.767  1.0
  As  As3  1  0.000  0.983  0.017  1.0
  H  H4  1  0.438  0.027  0.844  1.0
  H  H5  1  0.562  0.717  0.412  1.0
  H  H6  1  0.062  0.338  0.033  1.0
  H  H7  1  0.938  0.906  0.723  1.0
  O  O8  1  0.574  0.038  0.701  1.0
  O  O9  1  0.253  0.022  0.050  1.0
  O  O10  1  0.426  0.725  0.536  1.0
  O  O11  1  0.747  0.697  0.230  1.0
  O  O12  1  0.753  0.700  0.728  1.0
  O  O13  1  0.926  0.214  0.025  1.0
  O  O14  1  0.247  0.520  0.053  1.0
  O  O15  1  0.074  0.049  0.712  1.0
[/CIF]
.