The structure described by NaSe crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to six equivalent Se(1) atoms to form edge-sharing NaSe6 octahedra. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to six equivalent Se(1) atoms. Se(1) is bonded in a 7-coordinate geometry to three equivalent Na(1), three equivalent Na(2), and one Se(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaSe
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.649
_cell_length_b   4.649
_cell_length_c   10.761
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   201.388
_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  0.000  0.000  0.000  1.0
  Na  Na1  1  0.000  0.000  0.500  1.0
  Na  Na2  1  0.333  0.667  0.250  1.0
  Na  Na3  1  0.667  0.333  0.750  1.0
  Se  Se4  1  0.333  0.667  0.636  1.0
  Se  Se5  1  0.667  0.333  0.136  1.0
  Se  Se6  1  0.667  0.333  0.364  1.0
  Se  Se7  1  0.333  0.667  0.864  1.0
[/CIF]
.
The structure described by NaSe crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to six equivalent Se(1) atoms to form edge-sharing NaSe6 octahedra. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to six equivalent Se(1) atoms. Se(1) is bonded in a 7-coordinate geometry to three equivalent Na(1), three equivalent Na(2), and one Se(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaSe
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.649
_cell_length_b   4.649
_cell_length_c   10.761
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   201.388
_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  0.000  0.000  0.000  1.0
  Na  Na1  1  0.000  0.000  0.500  1.0
  Na  Na2  1  0.333  0.667  0.250  1.0
  Na  Na3  1  0.667  0.333  0.750  1.0
  Se  Se4  1  0.333  0.667  0.636  1.0
  Se  Se5  1  0.667  0.333  0.136  1.0
  Se  Se6  1  0.667  0.333  0.364  1.0
  Se  Se7  1  0.333  0.667  0.864  1.0
[/CIF]
.