data_Na2P
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.07
_cell_length_b   8.07
_cell_length_c   4.88
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   157.34
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2P
_chemical_formula_sum   'Na4 P2'
_cell_volume   122.38
_cell_formula_units_Z   2
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  0.59  0.46  0.66  1.0
  Na  Na1  1  0.59  0.15  0.66  1.0
  Na  Na2  1  0.59  0.54  0.22  1.0
  Na  Na3  1  0.59  0.85  0.22  1.0
  P  P4  1  0.59  0.9  0.66  1.0
  P  P5  1  0.59  0.1  0.22  1.0

data_Na2P
_symmetry_space_group_name_H-M   P-1
_cell_length_a   3.17
_cell_length_b   4.88
_cell_length_c   8.07
_cell_angle_alpha   90.0
_cell_angle_beta   101.33
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   Na2P
_chemical_formula_sum   'Na4 P2'
_cell_volume   122.38
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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  2  0.15  0.28  0.15  1.0
  Na  Na1  2  0.46  0.28  0.46  1.0
  P  P2  2  0.1  0.72  0.1  1.0

Na Na Na Na P P
Na2P crystallizes in the triclinic P-1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one Na(2) and four equivalent Na(1) atoms. The Na(1)-Na(2) bond length is 2.51 Å. There are a spread of Na(1)-Na(1) bond distances ranging from 2.25-3.17 Å. In the second Na site, Na(2) is bonded in a 3-coordinate geometry to one Na(1) and three equivalent P(1) atoms. There are a spread of Na(2)-P(1) bond distances ranging from 2.01-2.76 Å. P(1) is bonded in a 3-coordinate geometry to three equivalent Na(2) atoms.