The structure described by Na5HfAs3 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 4-coordinate geometry to one As(1), one As(3), and two equivalent As(2) atoms. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one As(1), two equivalent As(2), and two equivalent As(3) atoms. In the third Na site, Na(3) is bonded in a 4-coordinate geometry to one As(2), two equivalent As(1), and two equivalent As(3) atoms. In the fourth Na site, Na(4) is bonded to one As(1), one As(2), and two equivalent As(3) atoms to form distorted NaAs4 tetrahedra that share corners with two equivalent Na(4)As4 tetrahedra, corners with three equivalent Na(5)As4 tetrahedra, corners with three equivalent Hf(1)As4 tetrahedra,  an edgeedge with one Na(5)As4 tetrahedra, and  an edgeedge with one Hf(1)As4 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 distorted NaAs4 tetrahedra that share corners with three equivalent Na(4)As4 tetrahedra, corners with five equivalent Hf(1)As4 tetrahedra,  an edgeedge with one Na(4)As4 tetrahedra, and  an edgeedge with one Na(5)As4 tetrahedra. Hf(1) is bonded to one As(2), one As(3), and two equivalent As(1) atoms to form distorted HfAs4 tetrahedra that share corners with three equivalent Na(4)As4 tetrahedra, corners with five equivalent Na(5)As4 tetrahedra,  an edgeedge with one Na(4)As4 tetrahedra, and  an edgeedge with one Hf(1)As4 tetrahedra. There are three inequivalent As sites. In the first As site, As(3) is bonded in a 9-coordinate geometry to one Na(1), one Na(5), two equivalent Na(2), two equivalent Na(3), two equivalent Na(4), and one Hf(1) atom. In the second As site, As(1) is bonded in a 8-coordinate geometry to one Na(1), one Na(2), one Na(4), one Na(5), two equivalent Na(3), and two equivalent Hf(1) atoms. In the third As site, As(2) 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 Hf(1) atom. is represented by the CIF file [CIF]
data_Na5HfAs3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.502
_cell_length_b   8.400
_cell_length_c   16.071
_cell_angle_alpha   59.114
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   869.115
_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  0.493  0.917  0.263  1.0
  Na  Na1  1  0.993  0.083  0.237  1.0
  Na  Na2  1  0.507  0.083  0.737  1.0
  Na  Na3  1  0.007  0.917  0.763  1.0
  Na  Na4  1  0.012  0.260  0.406  1.0
  Na  Na5  1  0.512  0.740  0.094  1.0
  Na  Na6  1  0.988  0.740  0.594  1.0
  Na  Na7  1  0.488  0.260  0.906  1.0
  Na  Na8  1  0.473  0.597  0.584  1.0
  Na  Na9  1  0.973  0.403  0.916  1.0
  Na  Na10  1  0.527  0.403  0.416  1.0
  Na  Na11  1  0.027  0.597  0.084  1.0
  Na  Na12  1  0.847  0.680  0.243  1.0
  Na  Na13  1  0.347  0.320  0.257  1.0
  Na  Na14  1  0.153  0.320  0.757  1.0
  Na  Na15  1  0.653  0.680  0.743  1.0
  Na  Na16  1  0.662  0.001  0.419  1.0
  Na  Na17  1  0.162  0.999  0.081  1.0
  Na  Na18  1  0.338  0.999  0.581  1.0
  Na  Na19  1  0.838  0.001  0.919  1.0
  Hf  Hf20  1  0.142  0.662  0.414  1.0
  Hf  Hf21  1  0.642  0.338  0.086  1.0
  Hf  Hf22  1  0.858  0.338  0.586  1.0
  Hf  Hf23  1  0.358  0.662  0.914  1.0
  As  As24  1  0.792  0.657  0.430  1.0
  As  As25  1  0.292  0.343  0.070  1.0
  As  As26  1  0.208  0.343  0.570  1.0
  As  As27  1  0.708  0.657  0.930  1.0
  As  As28  1  0.258  0.945  0.417  1.0
  As  As29  1  0.758  0.055  0.083  1.0
  As  As30  1  0.742  0.055  0.583  1.0
  As  As31  1  0.242  0.945  0.917  1.0
  As  As32  1  0.237  0.648  0.264  1.0
  As  As33  1  0.737  0.352  0.236  1.0
  As  As34  1  0.763  0.352  0.736  1.0
  As  As35  1  0.263  0.648  0.764  1.0
[/CIF]
.
The structure described by Na5HfAs3 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 4-coordinate geometry to one As(1), one As(3), and two equivalent As(2) atoms. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one As(1), two equivalent As(2), and two equivalent As(3) atoms. In the third Na site, Na(3) is bonded in a 4-coordinate geometry to one As(2), two equivalent As(1), and two equivalent As(3) atoms. In the fourth Na site, Na(4) is bonded to one As(1), one As(2), and two equivalent As(3) atoms to form distorted NaAs4 tetrahedra that share corners with two equivalent Na(4)As4 tetrahedra, corners with three equivalent Na(5)As4 tetrahedra, corners with three equivalent Hf(1)As4 tetrahedra,  an edgeedge with one Na(5)As4 tetrahedra, and  an edgeedge with one Hf(1)As4 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 distorted NaAs4 tetrahedra that share corners with three equivalent Na(4)As4 tetrahedra, corners with five equivalent Hf(1)As4 tetrahedra,  an edgeedge with one Na(4)As4 tetrahedra, and  an edgeedge with one Na(5)As4 tetrahedra. Hf(1) is bonded to one As(2), one As(3), and two equivalent As(1) atoms to form distorted HfAs4 tetrahedra that share corners with three equivalent Na(4)As4 tetrahedra, corners with five equivalent Na(5)As4 tetrahedra,  an edgeedge with one Na(4)As4 tetrahedra, and  an edgeedge with one Hf(1)As4 tetrahedra. There are three inequivalent As sites. In the first As site, As(3) is bonded in a 9-coordinate geometry to one Na(1), one Na(5), two equivalent Na(2), two equivalent Na(3), two equivalent Na(4), and one Hf(1) atom. In the second As site, As(1) is bonded in a 8-coordinate geometry to one Na(1), one Na(2), one Na(4), one Na(5), two equivalent Na(3), and two equivalent Hf(1) atoms. In the third As site, As(2) 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 Hf(1) atom. is represented by the CIF file [CIF]
data_Na5HfAs3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.502
_cell_length_b   8.400
_cell_length_c   16.071
_cell_angle_alpha   59.114
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   869.115
_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  0.493  0.917  0.263  1.0
  Na  Na1  1  0.993  0.083  0.237  1.0
  Na  Na2  1  0.507  0.083  0.737  1.0
  Na  Na3  1  0.007  0.917  0.763  1.0
  Na  Na4  1  0.012  0.260  0.406  1.0
  Na  Na5  1  0.512  0.740  0.094  1.0
  Na  Na6  1  0.988  0.740  0.594  1.0
  Na  Na7  1  0.488  0.260  0.906  1.0
  Na  Na8  1  0.473  0.597  0.584  1.0
  Na  Na9  1  0.973  0.403  0.916  1.0
  Na  Na10  1  0.527  0.403  0.416  1.0
  Na  Na11  1  0.027  0.597  0.084  1.0
  Na  Na12  1  0.847  0.680  0.243  1.0
  Na  Na13  1  0.347  0.320  0.257  1.0
  Na  Na14  1  0.153  0.320  0.757  1.0
  Na  Na15  1  0.653  0.680  0.743  1.0
  Na  Na16  1  0.662  0.001  0.419  1.0
  Na  Na17  1  0.162  0.999  0.081  1.0
  Na  Na18  1  0.338  0.999  0.581  1.0
  Na  Na19  1  0.838  0.001  0.919  1.0
  Hf  Hf20  1  0.142  0.662  0.414  1.0
  Hf  Hf21  1  0.642  0.338  0.086  1.0
  Hf  Hf22  1  0.858  0.338  0.586  1.0
  Hf  Hf23  1  0.358  0.662  0.914  1.0
  As  As24  1  0.792  0.657  0.430  1.0
  As  As25  1  0.292  0.343  0.070  1.0
  As  As26  1  0.208  0.343  0.570  1.0
  As  As27  1  0.708  0.657  0.930  1.0
  As  As28  1  0.258  0.945  0.417  1.0
  As  As29  1  0.758  0.055  0.083  1.0
  As  As30  1  0.742  0.055  0.583  1.0
  As  As31  1  0.242  0.945  0.917  1.0
  As  As32  1  0.237  0.648  0.264  1.0
  As  As33  1  0.737  0.352  0.236  1.0
  As  As34  1  0.763  0.352  0.736  1.0
  As  As35  1  0.263  0.648  0.764  1.0
[/CIF]
.