The crystal structure described by Na5As4 crystallizes in the monoclinic C2/m space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 7-coordinate geometry to two equivalent As(1) and five equivalent As(2) atoms. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to two equivalent As(2) and four equivalent As(1) atoms. In the third Na site, Na(3) is bonded in a distorted square co-planar geometry to four equivalent As(1) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 9-coordinate geometry to two equivalent Na(1), two equivalent Na(3), four equivalent Na(2), and one As(2) atom. In the second As site, As(2) is bonded in a 9-coordinate geometry to two equivalent Na(2), five equivalent Na(1), one As(1), and one As(2) atom. is represented by the CIF file [CIF]
data_Na5As4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.676
_cell_length_b   5.676
_cell_length_c   9.587
_cell_angle_alpha   71.533
_cell_angle_beta   71.533
_cell_angle_gamma   47.683
_symmetry_Int_Tables_number   1
_cell_volume   214.252
_cell_formula_units_Z   1
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  0.100  0.100  0.614  1.0
  Na  Na1  1  0.900  0.900  0.386  1.0
  Na  Na2  1  0.755  0.755  0.835  1.0
  Na  Na3  1  0.245  0.245  0.165  1.0
  Na  Na4  1  0.000  0.000  0.000  1.0
  As  As5  1  0.456  0.456  0.828  1.0
  As  As6  1  0.544  0.544  0.172  1.0
  As  As7  1  0.393  0.393  0.607  1.0
  As  As8  1  0.607  0.607  0.393  1.0
[/CIF]
.
The crystal structure described by Na5As4 crystallizes in the monoclinic C2/m space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 7-coordinate geometry to two equivalent As(1) and five equivalent As(2) atoms. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to two equivalent As(2) and four equivalent As(1) atoms. In the third Na site, Na(3) is bonded in a distorted square co-planar geometry to four equivalent As(1) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 9-coordinate geometry to two equivalent Na(1), two equivalent Na(3), four equivalent Na(2), and one As(2) atom. In the second As site, As(2) is bonded in a 9-coordinate geometry to two equivalent Na(2), five equivalent Na(1), one As(1), and one As(2) atom. is represented by the CIF file [CIF]
data_Na5As4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.676
_cell_length_b   5.676
_cell_length_c   9.587
_cell_angle_alpha   71.533
_cell_angle_beta   71.533
_cell_angle_gamma   47.683
_symmetry_Int_Tables_number   1
_cell_volume   214.252
_cell_formula_units_Z   1
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  0.100  0.100  0.614  1.0
  Na  Na1  1  0.900  0.900  0.386  1.0
  Na  Na2  1  0.755  0.755  0.835  1.0
  Na  Na3  1  0.245  0.245  0.165  1.0
  Na  Na4  1  0.000  0.000  0.000  1.0
  As  As5  1  0.456  0.456  0.828  1.0
  As  As6  1  0.544  0.544  0.172  1.0
  As  As7  1  0.393  0.393  0.607  1.0
  As  As8  1  0.607  0.607  0.393  1.0
[/CIF]
.