The compound described by NaAsO3 crystallizes in the triclinic P-1 space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(2), one O(3), one O(5), one O(7), one O(8), and one O(9) atom to form distorted NaO6 octahedra that share  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(2)O4 tetrahedra, corners with three equivalent As(3)O4 tetrahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, and  an edgeedge with one As(1)O4 tetrahedra. In the second Na site, Na(2) is bonded to one O(2), one O(3), one O(4), one O(6), one O(7), and one O(9) atom to form NaO6 octahedra that share  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(3)O4 tetrahedra, corners with three equivalent As(2)O4 tetrahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, and  an edgeedge with one As(1)O4 tetrahedra. In the third Na site, Na(3) is bonded to one O(2), one O(3), two equivalent O(5), and two equivalent O(6) atoms to form NaO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra, corners with two equivalent As(3)O4 tetrahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, and edges with two equivalent Na(3)O6 octahedra. There are three inequivalent As sites. In the first As site, As(1) is bonded to one O(2), one O(3), one O(4), and one O(8) atom to form AsO4 tetrahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra, corners with two equivalent Na(3)O6 octahedra,  a cornercorner with one As(2)O4 tetrahedra,  a cornercorner with one As(3)O4 tetrahedra,  an edgeedge with one Na(1)O6 octahedra, and  an edgeedge with one Na(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-62°. In the second As site, As(2) is bonded to one O(1), one O(4), one O(6), and one O(9) atom to form AsO4 tetrahedra that share  a cornercorner with one Na(1)O6 octahedra, corners with two equivalent Na(3)O6 octahedra, corners with three equivalent Na(2)O6 octahedra,  a cornercorner with one As(1)O4 tetrahedra, and  a cornercorner with one As(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-67°. In the third As site, As(3) is bonded to one O(1), one O(5), one O(7), and one O(8) atom to form AsO4 tetrahedra that share  a cornercorner with one Na(2)O6 octahedra, corners with two equivalent Na(3)O6 octahedra, corners with three equivalent Na(1)O6 octahedra,  a cornercorner with one As(1)O4 tetrahedra, and  a cornercorner with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 41-67°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one As(2) and one As(3) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Na(3), and one As(1) atom. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to one Na(1), one Na(2), one Na(3), and one As(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(2), one As(1), and one As(2) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Na(1), two equivalent Na(3), and one As(3) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Na(2), two equivalent Na(3), and one As(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Na(1), one Na(2), and one As(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Na(1), one As(1), and one As(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Na(1), one Na(2), and one As(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaAsO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.289
_cell_length_b   7.446
_cell_length_c   7.953
_cell_angle_alpha   103.539
_cell_angle_beta   91.397
_cell_angle_gamma   90.252
_symmetry_Int_Tables_number   1
_cell_volume   419.541
_cell_formula_units_Z   6
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  0.754  0.578  0.783  1.0
  Na  Na1  1  0.246  0.422  0.217  1.0
  Na  Na2  1  0.744  0.057  0.775  1.0
  Na  Na3  1  0.256  0.943  0.225  1.0
  Na  Na4  1  0.985  0.253  0.511  1.0
  Na  Na5  1  0.015  0.747  0.489  1.0
  As  As6  1  0.547  0.721  0.392  1.0
  As  As7  1  0.453  0.279  0.608  1.0
  As  As8  1  0.782  0.950  0.169  1.0
  As  As9  1  0.218  0.050  0.831  1.0
  As  As10  1  0.771  0.379  0.171  1.0
  As  As11  1  0.229  0.621  0.829  1.0
  O  O12  1  0.678  0.166  0.190  1.0
  O  O13  1  0.300  0.233  0.446  1.0
  O  O14  1  0.324  0.735  0.416  1.0
  O  O15  1  0.676  0.265  0.584  1.0
  O  O16  1  0.583  0.854  0.238  1.0
  O  O17  1  0.417  0.146  0.762  1.0
  O  O18  1  0.054  0.555  0.691  1.0
  O  O19  1  0.946  0.445  0.309  1.0
  O  O20  1  0.047  0.043  0.690  1.0
  O  O21  1  0.953  0.957  0.310  1.0
  O  O22  1  0.219  0.626  0.036  1.0
  O  O23  1  0.571  0.496  0.260  1.0
  O  O24  1  0.193  0.140  0.039  1.0
  O  O25  1  0.807  0.860  0.961  1.0
  O  O26  1  0.322  0.834  0.810  1.0
  O  O27  1  0.781  0.374  0.964  1.0
  O  O28  1  0.429  0.504  0.740  1.0
  O  O29  1  0.700  0.767  0.554  1.0
[/CIF]
.
The compound described by NaAsO3 crystallizes in the triclinic P-1 space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(2), one O(3), one O(5), one O(7), one O(8), and one O(9) atom to form distorted NaO6 octahedra that share  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(2)O4 tetrahedra, corners with three equivalent As(3)O4 tetrahedra, edges with two equivalent Na(2)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, and  an edgeedge with one As(1)O4 tetrahedra. In the second Na site, Na(2) is bonded to one O(2), one O(3), one O(4), one O(6), one O(7), and one O(9) atom to form NaO6 octahedra that share  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(3)O4 tetrahedra, corners with three equivalent As(2)O4 tetrahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(3)O6 octahedra, and  an edgeedge with one As(1)O4 tetrahedra. In the third Na site, Na(3) is bonded to one O(2), one O(3), two equivalent O(5), and two equivalent O(6) atoms to form NaO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra, corners with two equivalent As(3)O4 tetrahedra, edges with two equivalent Na(1)O6 octahedra, edges with two equivalent Na(2)O6 octahedra, and edges with two equivalent Na(3)O6 octahedra. There are three inequivalent As sites. In the first As site, As(1) is bonded to one O(2), one O(3), one O(4), and one O(8) atom to form AsO4 tetrahedra that share  a cornercorner with one Na(1)O6 octahedra,  a cornercorner with one Na(2)O6 octahedra, corners with two equivalent Na(3)O6 octahedra,  a cornercorner with one As(2)O4 tetrahedra,  a cornercorner with one As(3)O4 tetrahedra,  an edgeedge with one Na(1)O6 octahedra, and  an edgeedge with one Na(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-62°. In the second As site, As(2) is bonded to one O(1), one O(4), one O(6), and one O(9) atom to form AsO4 tetrahedra that share  a cornercorner with one Na(1)O6 octahedra, corners with two equivalent Na(3)O6 octahedra, corners with three equivalent Na(2)O6 octahedra,  a cornercorner with one As(1)O4 tetrahedra, and  a cornercorner with one As(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-67°. In the third As site, As(3) is bonded to one O(1), one O(5), one O(7), and one O(8) atom to form AsO4 tetrahedra that share  a cornercorner with one Na(2)O6 octahedra, corners with two equivalent Na(3)O6 octahedra, corners with three equivalent Na(1)O6 octahedra,  a cornercorner with one As(1)O4 tetrahedra, and  a cornercorner with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 41-67°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one As(2) and one As(3) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Na(3), and one As(1) atom. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to one Na(1), one Na(2), one Na(3), and one As(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(2), one As(1), and one As(2) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Na(1), two equivalent Na(3), and one As(3) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Na(2), two equivalent Na(3), and one As(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Na(1), one Na(2), and one As(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Na(1), one As(1), and one As(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Na(1), one Na(2), and one As(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaAsO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.289
_cell_length_b   7.446
_cell_length_c   7.953
_cell_angle_alpha   103.539
_cell_angle_beta   91.397
_cell_angle_gamma   90.252
_symmetry_Int_Tables_number   1
_cell_volume   419.541
_cell_formula_units_Z   6
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  0.754  0.578  0.783  1.0
  Na  Na1  1  0.246  0.422  0.217  1.0
  Na  Na2  1  0.744  0.057  0.775  1.0
  Na  Na3  1  0.256  0.943  0.225  1.0
  Na  Na4  1  0.985  0.253  0.511  1.0
  Na  Na5  1  0.015  0.747  0.489  1.0
  As  As6  1  0.547  0.721  0.392  1.0
  As  As7  1  0.453  0.279  0.608  1.0
  As  As8  1  0.782  0.950  0.169  1.0
  As  As9  1  0.218  0.050  0.831  1.0
  As  As10  1  0.771  0.379  0.171  1.0
  As  As11  1  0.229  0.621  0.829  1.0
  O  O12  1  0.678  0.166  0.190  1.0
  O  O13  1  0.300  0.233  0.446  1.0
  O  O14  1  0.324  0.735  0.416  1.0
  O  O15  1  0.676  0.265  0.584  1.0
  O  O16  1  0.583  0.854  0.238  1.0
  O  O17  1  0.417  0.146  0.762  1.0
  O  O18  1  0.054  0.555  0.691  1.0
  O  O19  1  0.946  0.445  0.309  1.0
  O  O20  1  0.047  0.043  0.690  1.0
  O  O21  1  0.953  0.957  0.310  1.0
  O  O22  1  0.219  0.626  0.036  1.0
  O  O23  1  0.571  0.496  0.260  1.0
  O  O24  1  0.193  0.140  0.039  1.0
  O  O25  1  0.807  0.860  0.961  1.0
  O  O26  1  0.322  0.834  0.810  1.0
  O  O27  1  0.781  0.374  0.964  1.0
  O  O28  1  0.429  0.504  0.740  1.0
  O  O29  1  0.700  0.767  0.554  1.0
[/CIF]
.