The crystal structure described by Na5SiP3 is alpha Pu-derived structured and 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 P(2), two equivalent P(1), and two equivalent P(3) atoms. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one P(3), two equivalent P(1), and two equivalent P(2) atoms. In the third Na site, Na(3) is bonded in a 4-coordinate geometry to one P(1), one P(2), and two equivalent P(3) atoms. In the fourth Na site, Na(4) is bonded to one P(1), one P(3), and two equivalent P(2) atoms to form distorted NaP4 tetrahedra that share corners with two equivalent Na(4)P4 tetrahedra, corners with three equivalent Na(5)P4 tetrahedra, corners with three equivalent Si(1)P4 tetrahedra,  an edgeedge with one Na(5)P4 tetrahedra, and  an edgeedge with one Si(1)P4 tetrahedra. In the fifth Na site, Na(5) is bonded to one P(2), one P(3), and two equivalent P(1) atoms to form distorted NaP4 tetrahedra that share corners with three equivalent Na(4)P4 tetrahedra, corners with five equivalent Si(1)P4 tetrahedra,  an edgeedge with one Na(4)P4 tetrahedra, and  an edgeedge with one Na(5)P4 tetrahedra. Si(1) is bonded to one P(1), one P(2), and two equivalent P(3) atoms to form distorted SiP4 tetrahedra that share corners with three equivalent Na(4)P4 tetrahedra, corners with five equivalent Na(5)P4 tetrahedra,  an edgeedge with one Na(4)P4 tetrahedra, and  an edgeedge with one Si(1)P4 tetrahedra. There are three inequivalent P sites. In the first P site, P(3) is bonded in a 9-coordinate geometry to one Na(2), one Na(4), one Na(5), two equivalent Na(1), two equivalent Na(3), and two equivalent Si(1) atoms. In the second P site, P(1) is bonded in a 9-coordinate geometry to one Na(3), one Na(4), two equivalent Na(1), two equivalent Na(2), two equivalent Na(5), and one Si(1) atom. In the third P site, P(2) is bonded in a 8-coordinate geometry to one Na(1), one Na(3), one Na(5), two equivalent Na(2), two equivalent Na(4), and one Si(1) atom. is represented by the CIF card [CIF]
data_Na5SiP3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.275
_cell_length_b   7.877
_cell_length_c   15.167
_cell_angle_alpha   59.263
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   746.974
_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  0.507  0.555  0.257  1.0
  Na  Na1  1  0.007  0.445  0.243  1.0
  Na  Na2  1  0.493  0.445  0.743  1.0
  Na  Na3  1  0.993  0.555  0.757  1.0
  Na  Na4  1  0.984  0.913  0.412  1.0
  Na  Na5  1  0.484  0.087  0.088  1.0
  Na  Na6  1  0.016  0.087  0.588  1.0
  Na  Na7  1  0.516  0.913  0.912  1.0
  Na  Na8  1  0.529  0.258  0.581  1.0
  Na  Na9  1  0.029  0.742  0.919  1.0
  Na  Na10  1  0.471  0.742  0.419  1.0
  Na  Na11  1  0.971  0.258  0.081  1.0
  Na  Na12  1  0.154  0.838  0.242  1.0
  Na  Na13  1  0.654  0.162  0.258  1.0
  Na  Na14  1  0.846  0.162  0.758  1.0
  Na  Na15  1  0.346  0.838  0.742  1.0
  Na  Na16  1  0.337  0.159  0.419  1.0
  Na  Na17  1  0.837  0.841  0.081  1.0
  Na  Na18  1  0.663  0.841  0.581  1.0
  Na  Na19  1  0.163  0.159  0.919  1.0
  Si  Si20  1  0.639  0.511  0.916  1.0
  Si  Si21  1  0.139  0.489  0.584  1.0
  Si  Si22  1  0.361  0.489  0.084  1.0
  Si  Si23  1  0.861  0.511  0.416  1.0
  P  P24  1  0.741  0.241  0.421  1.0
  P  P25  1  0.241  0.759  0.079  1.0
  P  P26  1  0.259  0.759  0.579  1.0
  P  P27  1  0.759  0.241  0.921  1.0
  P  P28  1  0.770  0.798  0.278  1.0
  P  P29  1  0.270  0.202  0.222  1.0
  P  P30  1  0.230  0.202  0.722  1.0
  P  P31  1  0.730  0.798  0.778  1.0
  P  P32  1  0.320  0.481  0.935  1.0
  P  P33  1  0.820  0.519  0.565  1.0
  P  P34  1  0.680  0.519  0.065  1.0
  P  P35  1  0.180  0.481  0.435  1.0
[/CIF]
.
The crystal structure described by Na5SiP3 is alpha Pu-derived structured and 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 P(2), two equivalent P(1), and two equivalent P(3) atoms. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one P(3), two equivalent P(1), and two equivalent P(2) atoms. In the third Na site, Na(3) is bonded in a 4-coordinate geometry to one P(1), one P(2), and two equivalent P(3) atoms. In the fourth Na site, Na(4) is bonded to one P(1), one P(3), and two equivalent P(2) atoms to form distorted NaP4 tetrahedra that share corners with two equivalent Na(4)P4 tetrahedra, corners with three equivalent Na(5)P4 tetrahedra, corners with three equivalent Si(1)P4 tetrahedra,  an edgeedge with one Na(5)P4 tetrahedra, and  an edgeedge with one Si(1)P4 tetrahedra. In the fifth Na site, Na(5) is bonded to one P(2), one P(3), and two equivalent P(1) atoms to form distorted NaP4 tetrahedra that share corners with three equivalent Na(4)P4 tetrahedra, corners with five equivalent Si(1)P4 tetrahedra,  an edgeedge with one Na(4)P4 tetrahedra, and  an edgeedge with one Na(5)P4 tetrahedra. Si(1) is bonded to one P(1), one P(2), and two equivalent P(3) atoms to form distorted SiP4 tetrahedra that share corners with three equivalent Na(4)P4 tetrahedra, corners with five equivalent Na(5)P4 tetrahedra,  an edgeedge with one Na(4)P4 tetrahedra, and  an edgeedge with one Si(1)P4 tetrahedra. There are three inequivalent P sites. In the first P site, P(3) is bonded in a 9-coordinate geometry to one Na(2), one Na(4), one Na(5), two equivalent Na(1), two equivalent Na(3), and two equivalent Si(1) atoms. In the second P site, P(1) is bonded in a 9-coordinate geometry to one Na(3), one Na(4), two equivalent Na(1), two equivalent Na(2), two equivalent Na(5), and one Si(1) atom. In the third P site, P(2) is bonded in a 8-coordinate geometry to one Na(1), one Na(3), one Na(5), two equivalent Na(2), two equivalent Na(4), and one Si(1) atom. is represented by the CIF card [CIF]
data_Na5SiP3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.275
_cell_length_b   7.877
_cell_length_c   15.167
_cell_angle_alpha   59.263
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   746.974
_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  0.507  0.555  0.257  1.0
  Na  Na1  1  0.007  0.445  0.243  1.0
  Na  Na2  1  0.493  0.445  0.743  1.0
  Na  Na3  1  0.993  0.555  0.757  1.0
  Na  Na4  1  0.984  0.913  0.412  1.0
  Na  Na5  1  0.484  0.087  0.088  1.0
  Na  Na6  1  0.016  0.087  0.588  1.0
  Na  Na7  1  0.516  0.913  0.912  1.0
  Na  Na8  1  0.529  0.258  0.581  1.0
  Na  Na9  1  0.029  0.742  0.919  1.0
  Na  Na10  1  0.471  0.742  0.419  1.0
  Na  Na11  1  0.971  0.258  0.081  1.0
  Na  Na12  1  0.154  0.838  0.242  1.0
  Na  Na13  1  0.654  0.162  0.258  1.0
  Na  Na14  1  0.846  0.162  0.758  1.0
  Na  Na15  1  0.346  0.838  0.742  1.0
  Na  Na16  1  0.337  0.159  0.419  1.0
  Na  Na17  1  0.837  0.841  0.081  1.0
  Na  Na18  1  0.663  0.841  0.581  1.0
  Na  Na19  1  0.163  0.159  0.919  1.0
  Si  Si20  1  0.639  0.511  0.916  1.0
  Si  Si21  1  0.139  0.489  0.584  1.0
  Si  Si22  1  0.361  0.489  0.084  1.0
  Si  Si23  1  0.861  0.511  0.416  1.0
  P  P24  1  0.741  0.241  0.421  1.0
  P  P25  1  0.241  0.759  0.079  1.0
  P  P26  1  0.259  0.759  0.579  1.0
  P  P27  1  0.759  0.241  0.921  1.0
  P  P28  1  0.770  0.798  0.278  1.0
  P  P29  1  0.270  0.202  0.222  1.0
  P  P30  1  0.230  0.202  0.722  1.0
  P  P31  1  0.730  0.798  0.778  1.0
  P  P32  1  0.320  0.481  0.935  1.0
  P  P33  1  0.820  0.519  0.565  1.0
  P  P34  1  0.680  0.519  0.065  1.0
  P  P35  1  0.180  0.481  0.435  1.0
[/CIF]
.