The compound described by Na5AsO5 crystallizes in the orthorhombic Pbcm space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), one O(2), and two equivalent O(4) atoms to form distorted NaO4 tetrahedra that share corners with three equivalent As(1)O4 tetrahedra, corners with six equivalent Na(3)O5 trigonal bipyramids, and edges with two equivalent Na(2)O4 trigonal pyramids. In the second Na site, Na(2) is bonded to two equivalent O(2) and two equivalent O(4) atoms to form distorted NaO4 trigonal pyramids that share corners with two equivalent As(1)O4 tetrahedra, corners with six equivalent Na(3)O5 trigonal bipyramids, corners with two equivalent Na(2)O4 trigonal pyramids, and edges with two equivalent Na(1)O4 tetrahedra. In the third Na site, Na(3) is bonded to one O(1), one O(2), one O(4), and two equivalent O(3) atoms to form distorted NaO5 trigonal bipyramids that share corners with two equivalent As(1)O4 tetrahedra, corners with three equivalent Na(1)O4 tetrahedra, corners with two equivalent Na(3)O5 trigonal bipyramids, corners with three equivalent Na(2)O4 trigonal pyramids,  an edgeedge with one As(1)O4 tetrahedra, and edges with three equivalent Na(3)O5 trigonal bipyramids. In the fourth Na site, Na(4) is bonded in a 5-coordinate geometry to one O(2) and four equivalent O(4) atoms. As(1) is bonded to one O(1), one O(3), and two equivalent O(4) atoms to form AsO4 tetrahedra that share corners with three equivalent Na(1)O4 tetrahedra, corners with four equivalent Na(3)O5 trigonal bipyramids, corners with two equivalent Na(2)O4 trigonal pyramids, and edges with two equivalent Na(3)O5 trigonal bipyramids. There are four inequivalent O sites. In the first O site, O(4) is bonded to one Na(1), one Na(2), one Na(3), two equivalent Na(4), and one As(1) atom to form distorted ONa5As octahedra that share corners with two equivalent O(4)Na5As octahedra, corners with two equivalent O(2)Na6 octahedra, corners with three equivalent O(1)Na3As tetrahedra,  a cornercorner with one O(3)Na4As trigonal bipyramid, edges with two equivalent O(4)Na5As octahedra, edges with two equivalent O(2)Na6 octahedra,  an edgeedge with one O(3)Na4As trigonal bipyramid, and  a faceface with one O(4)Na5As octahedra. The corner-sharing octahedral tilt angles range from 49-52°. In the second O site, O(1) is bonded to one Na(1), two equivalent Na(3), and one As(1) atom to form distorted ONa3As tetrahedra that share corners with three equivalent O(2)Na6 octahedra, corners with six equivalent O(4)Na5As octahedra, corners with three equivalent O(3)Na4As trigonal bipyramids, and  an edgeedge with one O(3)Na4As trigonal bipyramid. The corner-sharing octahedral tilt angles range from 49-69°. In the third O site, O(2) is bonded to one Na(1), one Na(4), two equivalent Na(2), and two equivalent Na(3) atoms to form ONa6 octahedra that share corners with two equivalent O(2)Na6 octahedra, corners with four equivalent O(4)Na5As octahedra, corners with three equivalent O(1)Na3As tetrahedra, corners with two equivalent O(3)Na4As trigonal bipyramids, edges with four equivalent O(4)Na5As octahedra, and  an edgeedge with one O(3)Na4As trigonal bipyramid. The corner-sharing octahedral tilt angles range from 49-53°. In the fourth O site, O(3) is bonded to four equivalent Na(3) and one As(1) atom to form distorted ONa4As trigonal bipyramids that share corners with two equivalent O(4)Na5As octahedra, corners with two equivalent O(2)Na6 octahedra, corners with three equivalent O(1)Na3As tetrahedra,  an edgeedge with one O(2)Na6 octahedra, edges with two equivalent O(4)Na5As octahedra,  an edgeedge with one O(1)Na3As tetrahedra, and edges with two equivalent O(3)Na4As trigonal bipyramids. The corner-sharing octahedral tilt angles range from 20-70°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na5AsO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.037
_cell_length_b   6.504
_cell_length_c   16.627
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   652.878
_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  0.559  0.750  0.411  1.0
  Na  Na1  1  0.559  0.250  0.089  1.0
  Na  Na2  1  0.441  0.250  0.589  1.0
  Na  Na3  1  0.441  0.750  0.911  1.0
  Na  Na4  1  0.424  0.500  0.250  1.0
  Na  Na5  1  0.576  0.000  0.750  1.0
  Na  Na6  1  0.866  0.494  0.585  1.0
  Na  Na7  1  0.866  0.506  0.915  1.0
  Na  Na8  1  0.134  0.994  0.415  1.0
  Na  Na9  1  0.134  0.006  0.085  1.0
  Na  Na10  1  0.134  0.506  0.415  1.0
  Na  Na11  1  0.134  0.494  0.085  1.0
  Na  Na12  1  0.866  0.006  0.585  1.0
  Na  Na13  1  0.866  0.994  0.915  1.0
  Na  Na14  1  0.087  0.750  0.770  1.0
  Na  Na15  1  0.087  0.250  0.730  1.0
  Na  Na16  1  0.913  0.250  0.230  1.0
  Na  Na17  1  0.913  0.750  0.270  1.0
  Na  Na18  1  0.576  0.500  0.750  1.0
  Na  Na19  1  0.424  0.000  0.250  1.0
  As  As20  1  0.307  0.750  0.596  1.0
  As  As21  1  0.307  0.250  0.904  1.0
  As  As22  1  0.693  0.250  0.404  1.0
  As  As23  1  0.693  0.750  0.096  1.0
  O  O24  1  0.427  0.750  0.058  1.0
  O  O25  1  0.427  0.250  0.442  1.0
  O  O26  1  0.573  0.250  0.942  1.0
  O  O27  1  0.573  0.750  0.558  1.0
  O  O28  1  0.744  0.250  0.676  1.0
  O  O29  1  0.744  0.750  0.824  1.0
  O  O30  1  0.111  0.750  0.520  1.0
  O  O31  1  0.111  0.250  0.980  1.0
  O  O32  1  0.889  0.250  0.480  1.0
  O  O33  1  0.889  0.750  0.020  1.0
  O  O34  1  0.744  0.465  0.345  1.0
  O  O35  1  0.744  0.535  0.155  1.0
  O  O36  1  0.256  0.965  0.655  1.0
  O  O37  1  0.256  0.035  0.845  1.0
  O  O38  1  0.256  0.535  0.655  1.0
  O  O39  1  0.256  0.465  0.845  1.0
  O  O40  1  0.744  0.035  0.345  1.0
  O  O41  1  0.744  0.965  0.155  1.0
  O  O42  1  0.256  0.750  0.324  1.0
  O  O43  1  0.256  0.250  0.176  1.0
[/CIF]
.
The compound described by Na5AsO5 crystallizes in the orthorhombic Pbcm space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), one O(2), and two equivalent O(4) atoms to form distorted NaO4 tetrahedra that share corners with three equivalent As(1)O4 tetrahedra, corners with six equivalent Na(3)O5 trigonal bipyramids, and edges with two equivalent Na(2)O4 trigonal pyramids. In the second Na site, Na(2) is bonded to two equivalent O(2) and two equivalent O(4) atoms to form distorted NaO4 trigonal pyramids that share corners with two equivalent As(1)O4 tetrahedra, corners with six equivalent Na(3)O5 trigonal bipyramids, corners with two equivalent Na(2)O4 trigonal pyramids, and edges with two equivalent Na(1)O4 tetrahedra. In the third Na site, Na(3) is bonded to one O(1), one O(2), one O(4), and two equivalent O(3) atoms to form distorted NaO5 trigonal bipyramids that share corners with two equivalent As(1)O4 tetrahedra, corners with three equivalent Na(1)O4 tetrahedra, corners with two equivalent Na(3)O5 trigonal bipyramids, corners with three equivalent Na(2)O4 trigonal pyramids,  an edgeedge with one As(1)O4 tetrahedra, and edges with three equivalent Na(3)O5 trigonal bipyramids. In the fourth Na site, Na(4) is bonded in a 5-coordinate geometry to one O(2) and four equivalent O(4) atoms. As(1) is bonded to one O(1), one O(3), and two equivalent O(4) atoms to form AsO4 tetrahedra that share corners with three equivalent Na(1)O4 tetrahedra, corners with four equivalent Na(3)O5 trigonal bipyramids, corners with two equivalent Na(2)O4 trigonal pyramids, and edges with two equivalent Na(3)O5 trigonal bipyramids. There are four inequivalent O sites. In the first O site, O(4) is bonded to one Na(1), one Na(2), one Na(3), two equivalent Na(4), and one As(1) atom to form distorted ONa5As octahedra that share corners with two equivalent O(4)Na5As octahedra, corners with two equivalent O(2)Na6 octahedra, corners with three equivalent O(1)Na3As tetrahedra,  a cornercorner with one O(3)Na4As trigonal bipyramid, edges with two equivalent O(4)Na5As octahedra, edges with two equivalent O(2)Na6 octahedra,  an edgeedge with one O(3)Na4As trigonal bipyramid, and  a faceface with one O(4)Na5As octahedra. The corner-sharing octahedral tilt angles range from 49-52°. In the second O site, O(1) is bonded to one Na(1), two equivalent Na(3), and one As(1) atom to form distorted ONa3As tetrahedra that share corners with three equivalent O(2)Na6 octahedra, corners with six equivalent O(4)Na5As octahedra, corners with three equivalent O(3)Na4As trigonal bipyramids, and  an edgeedge with one O(3)Na4As trigonal bipyramid. The corner-sharing octahedral tilt angles range from 49-69°. In the third O site, O(2) is bonded to one Na(1), one Na(4), two equivalent Na(2), and two equivalent Na(3) atoms to form ONa6 octahedra that share corners with two equivalent O(2)Na6 octahedra, corners with four equivalent O(4)Na5As octahedra, corners with three equivalent O(1)Na3As tetrahedra, corners with two equivalent O(3)Na4As trigonal bipyramids, edges with four equivalent O(4)Na5As octahedra, and  an edgeedge with one O(3)Na4As trigonal bipyramid. The corner-sharing octahedral tilt angles range from 49-53°. In the fourth O site, O(3) is bonded to four equivalent Na(3) and one As(1) atom to form distorted ONa4As trigonal bipyramids that share corners with two equivalent O(4)Na5As octahedra, corners with two equivalent O(2)Na6 octahedra, corners with three equivalent O(1)Na3As tetrahedra,  an edgeedge with one O(2)Na6 octahedra, edges with two equivalent O(4)Na5As octahedra,  an edgeedge with one O(1)Na3As tetrahedra, and edges with two equivalent O(3)Na4As trigonal bipyramids. The corner-sharing octahedral tilt angles range from 20-70°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na5AsO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.037
_cell_length_b   6.504
_cell_length_c   16.627
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   652.878
_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  0.559  0.750  0.411  1.0
  Na  Na1  1  0.559  0.250  0.089  1.0
  Na  Na2  1  0.441  0.250  0.589  1.0
  Na  Na3  1  0.441  0.750  0.911  1.0
  Na  Na4  1  0.424  0.500  0.250  1.0
  Na  Na5  1  0.576  0.000  0.750  1.0
  Na  Na6  1  0.866  0.494  0.585  1.0
  Na  Na7  1  0.866  0.506  0.915  1.0
  Na  Na8  1  0.134  0.994  0.415  1.0
  Na  Na9  1  0.134  0.006  0.085  1.0
  Na  Na10  1  0.134  0.506  0.415  1.0
  Na  Na11  1  0.134  0.494  0.085  1.0
  Na  Na12  1  0.866  0.006  0.585  1.0
  Na  Na13  1  0.866  0.994  0.915  1.0
  Na  Na14  1  0.087  0.750  0.770  1.0
  Na  Na15  1  0.087  0.250  0.730  1.0
  Na  Na16  1  0.913  0.250  0.230  1.0
  Na  Na17  1  0.913  0.750  0.270  1.0
  Na  Na18  1  0.576  0.500  0.750  1.0
  Na  Na19  1  0.424  0.000  0.250  1.0
  As  As20  1  0.307  0.750  0.596  1.0
  As  As21  1  0.307  0.250  0.904  1.0
  As  As22  1  0.693  0.250  0.404  1.0
  As  As23  1  0.693  0.750  0.096  1.0
  O  O24  1  0.427  0.750  0.058  1.0
  O  O25  1  0.427  0.250  0.442  1.0
  O  O26  1  0.573  0.250  0.942  1.0
  O  O27  1  0.573  0.750  0.558  1.0
  O  O28  1  0.744  0.250  0.676  1.0
  O  O29  1  0.744  0.750  0.824  1.0
  O  O30  1  0.111  0.750  0.520  1.0
  O  O31  1  0.111  0.250  0.980  1.0
  O  O32  1  0.889  0.250  0.480  1.0
  O  O33  1  0.889  0.750  0.020  1.0
  O  O34  1  0.744  0.465  0.345  1.0
  O  O35  1  0.744  0.535  0.155  1.0
  O  O36  1  0.256  0.965  0.655  1.0
  O  O37  1  0.256  0.035  0.845  1.0
  O  O38  1  0.256  0.535  0.655  1.0
  O  O39  1  0.256  0.465  0.845  1.0
  O  O40  1  0.744  0.035  0.345  1.0
  O  O41  1  0.744  0.965  0.155  1.0
  O  O42  1  0.256  0.750  0.324  1.0
  O  O43  1  0.256  0.250  0.176  1.0
[/CIF]
.