The structure described by Na5SiAs3 crystallizes in the monoclinic P2_1/c space group. There are five inequivalent Na sites. In the first Na site, Na(1) is bonded in a 3-coordinate geometry to one As(2), two equivalent As(1), and two equivalent As(3) atoms. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one As(1), one As(2), and two equivalent As(3) atoms. In the third Na site, Na(3) is bonded in a 5-coordinate geometry to one As(3), two equivalent As(1), and two equivalent As(2) atoms. In the fourth Na site, Na(4) is bonded to one As(2), one As(3), and two equivalent As(1) atoms to form a mixture of distorted edge and corner-sharing NaAs4 tetrahedra. In the fifth Na site, Na(5) is bonded to one As(1), one As(3), and two equivalent As(2) atoms to form a mixture of distorted edge and corner-sharing NaAs4 tetrahedra. Si(1) is bonded in a 4-coordinate geometry to one As(1), one As(2), and two equivalent As(3) atoms. There are three inequivalent As sites. In the first As site, As(3) is bonded in a 9-coordinate geometry to one Na(3), one Na(4), one Na(5), two equivalent Na(1), two equivalent Na(2), and two equivalent Si(1) atoms. In the second As site, As(1) is bonded in a 9-coordinate geometry to one Na(2), one Na(5), two equivalent Na(1), two equivalent Na(3), two equivalent Na(4), and one Si(1) atom. In the third As site, As(2) is bonded in a 8-coordinate geometry to one Na(1), one Na(2), one Na(4), two equivalent Na(3), two equivalent Na(5), and one Si(1) atom. is represented by the CIF card [CIF]
data_Na5SiAs3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.475
_cell_length_b   8.144
_cell_length_c   15.604
_cell_angle_alpha   58.873
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   813.178
_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  0.505  0.559  0.757  1.0
  Na  Na1  1  0.005  0.441  0.743  1.0
  Na  Na2  1  0.495  0.441  0.243  1.0
  Na  Na3  1  0.995  0.559  0.257  1.0
  Na  Na4  1  0.967  0.252  0.583  1.0
  Na  Na5  1  0.467  0.748  0.917  1.0
  Na  Na6  1  0.033  0.748  0.417  1.0
  Na  Na7  1  0.533  0.252  0.083  1.0
  Na  Na8  1  0.482  0.089  0.587  1.0
  Na  Na9  1  0.982  0.911  0.913  1.0
  Na  Na10  1  0.518  0.911  0.413  1.0
  Na  Na11  1  0.018  0.089  0.087  1.0
  Na  Na12  1  0.338  0.158  0.919  1.0
  Na  Na13  1  0.838  0.842  0.581  1.0
  Na  Na14  1  0.662  0.842  0.081  1.0
  Na  Na15  1  0.162  0.158  0.419  1.0
  Na  Na16  1  0.151  0.834  0.741  1.0
  Na  Na17  1  0.651  0.166  0.759  1.0
  Na  Na18  1  0.849  0.166  0.259  1.0
  Na  Na19  1  0.349  0.834  0.241  1.0
  Si  Si20  1  0.141  0.486  0.085  1.0
  Si  Si21  1  0.641  0.514  0.415  1.0
  Si  Si22  1  0.859  0.514  0.915  1.0
  Si  Si23  1  0.359  0.486  0.585  1.0
  As  As24  1  0.238  0.761  0.580  1.0
  As  As25  1  0.738  0.239  0.920  1.0
  As  As26  1  0.762  0.239  0.420  1.0
  As  As27  1  0.262  0.761  0.080  1.0
  As  As28  1  0.265  0.192  0.725  1.0
  As  As29  1  0.765  0.808  0.775  1.0
  As  As30  1  0.735  0.808  0.275  1.0
  As  As31  1  0.235  0.192  0.225  1.0
  As  As32  1  0.184  0.478  0.934  1.0
  As  As33  1  0.684  0.522  0.566  1.0
  As  As34  1  0.816  0.522  0.066  1.0
  As  As35  1  0.316  0.478  0.434  1.0
[/CIF]
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The structure described by Na5SiAs3 crystallizes in the monoclinic P2_1/c space group. There are five inequivalent Na sites. In the first Na site, Na(1) is bonded in a 3-coordinate geometry to one As(2), two equivalent As(1), and two equivalent As(3) atoms. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one As(1), one As(2), and two equivalent As(3) atoms. In the third Na site, Na(3) is bonded in a 5-coordinate geometry to one As(3), two equivalent As(1), and two equivalent As(2) atoms. In the fourth Na site, Na(4) is bonded to one As(2), one As(3), and two equivalent As(1) atoms to form a mixture of distorted edge and corner-sharing NaAs4 tetrahedra. In the fifth Na site, Na(5) is bonded to one As(1), one As(3), and two equivalent As(2) atoms to form a mixture of distorted edge and corner-sharing NaAs4 tetrahedra. Si(1) is bonded in a 4-coordinate geometry to one As(1), one As(2), and two equivalent As(3) atoms. There are three inequivalent As sites. In the first As site, As(3) is bonded in a 9-coordinate geometry to one Na(3), one Na(4), one Na(5), two equivalent Na(1), two equivalent Na(2), and two equivalent Si(1) atoms. In the second As site, As(1) is bonded in a 9-coordinate geometry to one Na(2), one Na(5), two equivalent Na(1), two equivalent Na(3), two equivalent Na(4), and one Si(1) atom. In the third As site, As(2) is bonded in a 8-coordinate geometry to one Na(1), one Na(2), one Na(4), two equivalent Na(3), two equivalent Na(5), and one Si(1) atom. is represented by the CIF card [CIF]
data_Na5SiAs3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.475
_cell_length_b   8.144
_cell_length_c   15.604
_cell_angle_alpha   58.873
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   813.178
_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  0.505  0.559  0.757  1.0
  Na  Na1  1  0.005  0.441  0.743  1.0
  Na  Na2  1  0.495  0.441  0.243  1.0
  Na  Na3  1  0.995  0.559  0.257  1.0
  Na  Na4  1  0.967  0.252  0.583  1.0
  Na  Na5  1  0.467  0.748  0.917  1.0
  Na  Na6  1  0.033  0.748  0.417  1.0
  Na  Na7  1  0.533  0.252  0.083  1.0
  Na  Na8  1  0.482  0.089  0.587  1.0
  Na  Na9  1  0.982  0.911  0.913  1.0
  Na  Na10  1  0.518  0.911  0.413  1.0
  Na  Na11  1  0.018  0.089  0.087  1.0
  Na  Na12  1  0.338  0.158  0.919  1.0
  Na  Na13  1  0.838  0.842  0.581  1.0
  Na  Na14  1  0.662  0.842  0.081  1.0
  Na  Na15  1  0.162  0.158  0.419  1.0
  Na  Na16  1  0.151  0.834  0.741  1.0
  Na  Na17  1  0.651  0.166  0.759  1.0
  Na  Na18  1  0.849  0.166  0.259  1.0
  Na  Na19  1  0.349  0.834  0.241  1.0
  Si  Si20  1  0.141  0.486  0.085  1.0
  Si  Si21  1  0.641  0.514  0.415  1.0
  Si  Si22  1  0.859  0.514  0.915  1.0
  Si  Si23  1  0.359  0.486  0.585  1.0
  As  As24  1  0.238  0.761  0.580  1.0
  As  As25  1  0.738  0.239  0.920  1.0
  As  As26  1  0.762  0.239  0.420  1.0
  As  As27  1  0.262  0.761  0.080  1.0
  As  As28  1  0.265  0.192  0.725  1.0
  As  As29  1  0.765  0.808  0.775  1.0
  As  As30  1  0.735  0.808  0.275  1.0
  As  As31  1  0.235  0.192  0.225  1.0
  As  As32  1  0.184  0.478  0.934  1.0
  As  As33  1  0.684  0.522  0.566  1.0
  As  As34  1  0.816  0.522  0.066  1.0
  As  As35  1  0.316  0.478  0.434  1.0
[/CIF]
.