The structure described by PPSe crystallizes in the tetragonal I4_1/amd space group. P(1) is bonded to four equivalent P(1) and two equivalent Se(1) atoms to form a mixture of distorted face and corner-sharing PP4Se2 octahedra. The corner-sharing octahedral tilt angles range from 0-76°. Se(1) is bonded in a 4-coordinate geometry to four equivalent P(1) atoms. is represented by the CIF card [CIF]
data_P2Se
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.264
_cell_length_b   5.264
_cell_length_c   5.264
_cell_angle_alpha   103.690
_cell_angle_beta   103.690
_cell_angle_gamma   121.779
_symmetry_Int_Tables_number   1
_cell_volume   108.347
_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
  P  P0  1  0.125  0.875  0.250  1.0
  P  P1  1  0.625  0.875  0.750  1.0
  P  P2  1  0.125  0.375  0.250  1.0
  P  P3  1  0.125  0.875  0.750  1.0
  Se  Se4  1  0.750  0.250  0.500  1.0
  Se  Se5  1  0.500  0.500  0.000  1.0
[/CIF]
.
The structure described by PPSe crystallizes in the tetragonal I4_1/amd space group. P(1) is bonded to four equivalent P(1) and two equivalent Se(1) atoms to form a mixture of distorted face and corner-sharing PP4Se2 octahedra. The corner-sharing octahedral tilt angles range from 0-76°. Se(1) is bonded in a 4-coordinate geometry to four equivalent P(1) atoms. is represented by the CIF card [CIF]
data_P2Se
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.264
_cell_length_b   5.264
_cell_length_c   5.264
_cell_angle_alpha   103.690
_cell_angle_beta   103.690
_cell_angle_gamma   121.779
_symmetry_Int_Tables_number   1
_cell_volume   108.347
_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
  P  P0  1  0.125  0.875  0.250  1.0
  P  P1  1  0.625  0.875  0.750  1.0
  P  P2  1  0.125  0.375  0.250  1.0
  P  P3  1  0.125  0.875  0.750  1.0
  Se  Se4  1  0.750  0.250  0.500  1.0
  Se  Se5  1  0.500  0.500  0.000  1.0
[/CIF]
.