data_NaSiP
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.09
_cell_length_b   4.09
_cell_length_c   6.51
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NaSiP
_chemical_formula_sum   'Na2 Si2 P2'
_cell_volume   108.81
_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  0.0  0.0  0.0  1.0
  Na  Na1  1  0.04  0.04  0.0  1.0
  Si  Si4  1  0.04  0.0  0.26  1.0
  Si  Si5  1  0.0  0.04  0.25  1.0
  P  P2  1  0.04  0.0  0.47  1.0
  P  P3  1  0.0  0.04  0.03  1.0

data_NaSiP
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.78
_cell_length_b   5.78
_cell_length_c   6.51
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   NaSiP
_chemical_formula_sum   'Na4 Si4 P4'
_cell_volume   217.61
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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  4  0.02  0.02  0.0  1.0
  Si  Si1  2  0.0  0.0  0.25  1.0
  Si  Si2  2  0.04  0.0  0.26  1.0
  P  P3  2  0.0  0.0  0.03  1.0
  P  P4  2  0.04  0.0  0.47  1.0

Na Na Si Si P P
Na2PSi2P is High Pressure Cadmuum Telluride structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Na2P clusters and two Si2P clusters. In each Na2P cluster, Na(1) is bonded in a single-bond geometry to one P(2) atom. The Na(1)-P(2) bond length is 0.28 Å. P(2) is bonded in a 2-coordinate geometry to two equivalent Na(1) atoms. In each Si2P cluster, there are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted single-bond geometry to one Si(2) and one P(1) atom. The Si(1)-Si(2) bond length is 0.26 Å. The Si(1)-P(1) bond length is 1.41 Å. In the second Si site, Si(2) is bonded in a 1-coordinate geometry to one Si(1) atom. P(1) is bonded in a distorted single-bond geometry to one Si(1) atom.