The crystal structure described by Fe(AsO2)2 crystallizes in the tetragonal P4_2/mbc space group. Fe(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form edge-sharing FeO6 octahedra. As(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1) and two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Fe(1) and one As(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Fe(1) and two equivalent As(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Fe(AsO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.629
_cell_length_b   8.629
_cell_length_c   5.762
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   429.066
_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
  Fe  Fe0  1  0.500  0.000  0.250  1.0
  Fe  Fe1  1  0.500  0.000  0.750  1.0
  Fe  Fe2  1  0.000  0.500  0.250  1.0
  Fe  Fe3  1  0.000  0.500  0.750  1.0
  As  As4  1  0.810  0.175  0.500  1.0
  As  As5  1  0.175  0.190  0.000  1.0
  As  As6  1  0.675  0.310  0.000  1.0
  As  As7  1  0.310  0.325  0.500  1.0
  As  As8  1  0.690  0.675  0.500  1.0
  As  As9  1  0.325  0.690  0.000  1.0
  As  As10  1  0.825  0.810  0.000  1.0
  As  As11  1  0.190  0.825  0.500  1.0
  O  O12  1  0.642  0.110  0.000  1.0
  O  O13  1  0.610  0.142  0.500  1.0
  O  O14  1  0.317  0.183  0.250  1.0
  O  O15  1  0.317  0.183  0.750  1.0
  O  O16  1  0.817  0.317  0.250  1.0
  O  O17  1  0.817  0.317  0.750  1.0
  O  O18  1  0.110  0.358  0.500  1.0
  O  O19  1  0.142  0.390  0.000  1.0
  O  O20  1  0.858  0.610  0.000  1.0
  O  O21  1  0.890  0.642  0.500  1.0
  O  O22  1  0.183  0.683  0.250  1.0
  O  O23  1  0.183  0.683  0.750  1.0
  O  O24  1  0.683  0.817  0.250  1.0
  O  O25  1  0.683  0.817  0.750  1.0
  O  O26  1  0.390  0.858  0.500  1.0
  O  O27  1  0.358  0.890  0.000  1.0
[/CIF]
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The crystal structure described by Fe(AsO2)2 crystallizes in the tetragonal P4_2/mbc space group. Fe(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form edge-sharing FeO6 octahedra. As(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1) and two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Fe(1) and one As(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Fe(1) and two equivalent As(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Fe(AsO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.629
_cell_length_b   8.629
_cell_length_c   5.762
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   429.066
_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
  Fe  Fe0  1  0.500  0.000  0.250  1.0
  Fe  Fe1  1  0.500  0.000  0.750  1.0
  Fe  Fe2  1  0.000  0.500  0.250  1.0
  Fe  Fe3  1  0.000  0.500  0.750  1.0
  As  As4  1  0.810  0.175  0.500  1.0
  As  As5  1  0.175  0.190  0.000  1.0
  As  As6  1  0.675  0.310  0.000  1.0
  As  As7  1  0.310  0.325  0.500  1.0
  As  As8  1  0.690  0.675  0.500  1.0
  As  As9  1  0.325  0.690  0.000  1.0
  As  As10  1  0.825  0.810  0.000  1.0
  As  As11  1  0.190  0.825  0.500  1.0
  O  O12  1  0.642  0.110  0.000  1.0
  O  O13  1  0.610  0.142  0.500  1.0
  O  O14  1  0.317  0.183  0.250  1.0
  O  O15  1  0.317  0.183  0.750  1.0
  O  O16  1  0.817  0.317  0.250  1.0
  O  O17  1  0.817  0.317  0.750  1.0
  O  O18  1  0.110  0.358  0.500  1.0
  O  O19  1  0.142  0.390  0.000  1.0
  O  O20  1  0.858  0.610  0.000  1.0
  O  O21  1  0.890  0.642  0.500  1.0
  O  O22  1  0.183  0.683  0.250  1.0
  O  O23  1  0.183  0.683  0.750  1.0
  O  O24  1  0.683  0.817  0.250  1.0
  O  O25  1  0.683  0.817  0.750  1.0
  O  O26  1  0.390  0.858  0.500  1.0
  O  O27  1  0.358  0.890  0.000  1.0
[/CIF]
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