The crystal structure described by NaW2AsO9 crystallizes in the orthorhombic P2_12_12_1 space group. Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(8) atom. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(2), one O(3), one O(7), one O(9), and two equivalent O(8) atoms to form distorted WO6 octahedra that share corners with two equivalent W(1)O6 octahedra, corners with two equivalent W(2)O6 octahedra, and  a cornercorner with one As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 24-40°. In the second W site, W(2) is bonded to one O(1), one O(4), one O(5), one O(6), one O(7), and one O(9) atom to form distorted WO6 octahedra that share corners with two equivalent W(1)O6 octahedra and corners with three equivalent As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 24-40°. As(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form AsO4 tetrahedra that share  a cornercorner with one W(1)O6 octahedra and corners with three equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-54°. There are nine inequivalent O sites. In the first O site, O(5) is bonded in a bent 120 degrees geometry to one W(2) and one As(1) atom. In the second O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Na(1), one W(2), and one As(1) atom. In the third O site, O(7) is bonded in a bent 150 degrees geometry to one W(1) and one W(2) atom. In the fourth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Na(1) and two equivalent W(1) atoms. In the fifth O site, O(1) is bonded in a bent 150 degrees geometry to one Na(1) and one W(2) atom. In the sixth O site, O(9) is bonded in a bent 150 degrees geometry to one W(1) and one W(2) atom. In the seventh O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Na(1) and one W(1) atom. In the eighth O site, O(3) is bonded in a distorted trigonal planar geometry to one Na(1), one W(1), and one As(1) atom. In the ninth O site, O(4) is bonded in a distorted trigonal planar geometry to one Na(1), one W(2), and one As(1) atom. is represented by the CIF file [CIF]
data_NaAsW2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.001
_cell_length_b   8.900
_cell_length_c   16.860
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   750.380
_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
  Na  Na0  1  0.304  0.515  0.109  1.0
  Na  Na1  1  0.196  0.485  0.609  1.0
  Na  Na2  1  0.804  0.985  0.891  1.0
  Na  Na3  1  0.696  0.015  0.391  1.0
  As  As4  1  0.636  0.229  0.229  1.0
  As  As5  1  0.864  0.771  0.729  1.0
  As  As6  1  0.136  0.271  0.771  1.0
  As  As7  1  0.364  0.729  0.271  1.0
  W  W8  1  0.637  0.619  0.456  1.0
  W  W9  1  0.863  0.381  0.956  1.0
  W  W10  1  0.137  0.881  0.544  1.0
  W  W11  1  0.363  0.119  0.044  1.0
  W  W12  1  0.885  0.893  0.156  1.0
  W  W13  1  0.615  0.107  0.656  1.0
  W  W14  1  0.385  0.607  0.844  1.0
  W  W15  1  0.115  0.393  0.344  1.0
  O  O16  1  0.965  0.248  0.399  1.0
  O  O17  1  0.535  0.752  0.899  1.0
  O  O18  1  0.465  0.252  0.601  1.0
  O  O19  1  0.035  0.748  0.101  1.0
  O  O20  1  0.782  0.503  0.528  1.0
  O  O21  1  0.718  0.497  0.028  1.0
  O  O22  1  0.282  0.997  0.472  1.0
  O  O23  1  0.218  0.003  0.972  1.0
  O  O24  1  0.513  0.271  0.138  1.0
  O  O25  1  0.987  0.729  0.638  1.0
  O  O26  1  0.013  0.229  0.862  1.0
  O  O27  1  0.487  0.771  0.362  1.0
  O  O28  1  0.721  0.045  0.244  1.0
  O  O29  1  0.779  0.955  0.744  1.0
  O  O30  1  0.221  0.455  0.756  1.0
  O  O31  1  0.279  0.545  0.256  1.0
  O  O32  1  0.905  0.348  0.244  1.0
  O  O33  1  0.595  0.652  0.744  1.0
  O  O34  1  0.405  0.152  0.756  1.0
  O  O35  1  0.095  0.848  0.256  1.0
  O  O36  1  0.405  0.255  0.304  1.0
  O  O37  1  0.095  0.745  0.804  1.0
  O  O38  1  0.905  0.245  0.696  1.0
  O  O39  1  0.595  0.755  0.196  1.0
  O  O40  1  0.866  0.550  0.369  1.0
  O  O41  1  0.634  0.450  0.869  1.0
  O  O42  1  0.366  0.950  0.631  1.0
  O  O43  1  0.134  0.050  0.131  1.0
  O  O44  1  0.855  0.795  0.476  1.0
  O  O45  1  0.645  0.205  0.976  1.0
  O  O46  1  0.355  0.705  0.524  1.0
  O  O47  1  0.145  0.295  0.024  1.0
  O  O48  1  0.363  0.476  0.418  1.0
  O  O49  1  0.137  0.524  0.918  1.0
  O  O50  1  0.863  0.024  0.582  1.0
  O  O51  1  0.637  0.976  0.082  1.0
[/CIF]
.
The crystal structure described by NaW2AsO9 crystallizes in the orthorhombic P2_12_12_1 space group. Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(8) atom. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(2), one O(3), one O(7), one O(9), and two equivalent O(8) atoms to form distorted WO6 octahedra that share corners with two equivalent W(1)O6 octahedra, corners with two equivalent W(2)O6 octahedra, and  a cornercorner with one As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 24-40°. In the second W site, W(2) is bonded to one O(1), one O(4), one O(5), one O(6), one O(7), and one O(9) atom to form distorted WO6 octahedra that share corners with two equivalent W(1)O6 octahedra and corners with three equivalent As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 24-40°. As(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form AsO4 tetrahedra that share  a cornercorner with one W(1)O6 octahedra and corners with three equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-54°. There are nine inequivalent O sites. In the first O site, O(5) is bonded in a bent 120 degrees geometry to one W(2) and one As(1) atom. In the second O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Na(1), one W(2), and one As(1) atom. In the third O site, O(7) is bonded in a bent 150 degrees geometry to one W(1) and one W(2) atom. In the fourth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Na(1) and two equivalent W(1) atoms. In the fifth O site, O(1) is bonded in a bent 150 degrees geometry to one Na(1) and one W(2) atom. In the sixth O site, O(9) is bonded in a bent 150 degrees geometry to one W(1) and one W(2) atom. In the seventh O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Na(1) and one W(1) atom. In the eighth O site, O(3) is bonded in a distorted trigonal planar geometry to one Na(1), one W(1), and one As(1) atom. In the ninth O site, O(4) is bonded in a distorted trigonal planar geometry to one Na(1), one W(2), and one As(1) atom. is represented by the CIF file [CIF]
data_NaAsW2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.001
_cell_length_b   8.900
_cell_length_c   16.860
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   750.380
_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
  Na  Na0  1  0.304  0.515  0.109  1.0
  Na  Na1  1  0.196  0.485  0.609  1.0
  Na  Na2  1  0.804  0.985  0.891  1.0
  Na  Na3  1  0.696  0.015  0.391  1.0
  As  As4  1  0.636  0.229  0.229  1.0
  As  As5  1  0.864  0.771  0.729  1.0
  As  As6  1  0.136  0.271  0.771  1.0
  As  As7  1  0.364  0.729  0.271  1.0
  W  W8  1  0.637  0.619  0.456  1.0
  W  W9  1  0.863  0.381  0.956  1.0
  W  W10  1  0.137  0.881  0.544  1.0
  W  W11  1  0.363  0.119  0.044  1.0
  W  W12  1  0.885  0.893  0.156  1.0
  W  W13  1  0.615  0.107  0.656  1.0
  W  W14  1  0.385  0.607  0.844  1.0
  W  W15  1  0.115  0.393  0.344  1.0
  O  O16  1  0.965  0.248  0.399  1.0
  O  O17  1  0.535  0.752  0.899  1.0
  O  O18  1  0.465  0.252  0.601  1.0
  O  O19  1  0.035  0.748  0.101  1.0
  O  O20  1  0.782  0.503  0.528  1.0
  O  O21  1  0.718  0.497  0.028  1.0
  O  O22  1  0.282  0.997  0.472  1.0
  O  O23  1  0.218  0.003  0.972  1.0
  O  O24  1  0.513  0.271  0.138  1.0
  O  O25  1  0.987  0.729  0.638  1.0
  O  O26  1  0.013  0.229  0.862  1.0
  O  O27  1  0.487  0.771  0.362  1.0
  O  O28  1  0.721  0.045  0.244  1.0
  O  O29  1  0.779  0.955  0.744  1.0
  O  O30  1  0.221  0.455  0.756  1.0
  O  O31  1  0.279  0.545  0.256  1.0
  O  O32  1  0.905  0.348  0.244  1.0
  O  O33  1  0.595  0.652  0.744  1.0
  O  O34  1  0.405  0.152  0.756  1.0
  O  O35  1  0.095  0.848  0.256  1.0
  O  O36  1  0.405  0.255  0.304  1.0
  O  O37  1  0.095  0.745  0.804  1.0
  O  O38  1  0.905  0.245  0.696  1.0
  O  O39  1  0.595  0.755  0.196  1.0
  O  O40  1  0.866  0.550  0.369  1.0
  O  O41  1  0.634  0.450  0.869  1.0
  O  O42  1  0.366  0.950  0.631  1.0
  O  O43  1  0.134  0.050  0.131  1.0
  O  O44  1  0.855  0.795  0.476  1.0
  O  O45  1  0.645  0.205  0.976  1.0
  O  O46  1  0.355  0.705  0.524  1.0
  O  O47  1  0.145  0.295  0.024  1.0
  O  O48  1  0.363  0.476  0.418  1.0
  O  O49  1  0.137  0.524  0.918  1.0
  O  O50  1  0.863  0.024  0.582  1.0
  O  O51  1  0.637  0.976  0.082  1.0
[/CIF]
.