The material structure described by CeSe2 crystallizes in the monoclinic P2/c space group. Ce(1) is bonded to one Se(1), one Se(2), one Se(3), and one Se(4) atom to form distorted corner-sharing CeSe4 tetrahedra. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a linear geometry to two equivalent Ce(1) atoms. In the second Se site, Se(2) is bonded in a linear geometry to two equivalent Ce(1) atoms. In the third Se site, Se(3) is bonded in a linear geometry to two equivalent Ce(1) atoms. In the fourth Se site, Se(4) is bonded in a linear geometry to two equivalent Ce(1) atoms. is represented by the CIF card [CIF]
data_CeSe2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.393
_cell_length_b   7.343
_cell_length_c   15.338
_cell_angle_alpha   66.986
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   766.364
_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
  Ce  Ce0  1  0.241  0.292  0.938  1.0
  Ce  Ce1  1  0.241  0.708  0.562  1.0
  Ce  Ce2  1  0.759  0.708  0.062  1.0
  Ce  Ce3  1  0.759  0.292  0.438  1.0
  Se  Se4  1  0.000  0.000  0.000  1.0
  Se  Se5  1  0.000  0.000  0.500  1.0
  Se  Se6  1  0.297  0.500  0.750  1.0
  Se  Se7  1  0.703  0.500  0.250  1.0
  Se  Se8  1  0.500  0.000  0.000  1.0
  Se  Se9  1  0.500  0.000  0.500  1.0
  Se  Se10  1  0.000  0.500  0.000  1.0
  Se  Se11  1  0.000  0.500  0.500  1.0
[/CIF]
.
The material structure described by CeSe2 crystallizes in the monoclinic P2/c space group. Ce(1) is bonded to one Se(1), one Se(2), one Se(3), and one Se(4) atom to form distorted corner-sharing CeSe4 tetrahedra. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a linear geometry to two equivalent Ce(1) atoms. In the second Se site, Se(2) is bonded in a linear geometry to two equivalent Ce(1) atoms. In the third Se site, Se(3) is bonded in a linear geometry to two equivalent Ce(1) atoms. In the fourth Se site, Se(4) is bonded in a linear geometry to two equivalent Ce(1) atoms. is represented by the CIF card [CIF]
data_CeSe2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.393
_cell_length_b   7.343
_cell_length_c   15.338
_cell_angle_alpha   66.986
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   766.364
_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
  Ce  Ce0  1  0.241  0.292  0.938  1.0
  Ce  Ce1  1  0.241  0.708  0.562  1.0
  Ce  Ce2  1  0.759  0.708  0.062  1.0
  Ce  Ce3  1  0.759  0.292  0.438  1.0
  Se  Se4  1  0.000  0.000  0.000  1.0
  Se  Se5  1  0.000  0.000  0.500  1.0
  Se  Se6  1  0.297  0.500  0.750  1.0
  Se  Se7  1  0.703  0.500  0.250  1.0
  Se  Se8  1  0.500  0.000  0.000  1.0
  Se  Se9  1  0.500  0.000  0.500  1.0
  Se  Se10  1  0.000  0.500  0.000  1.0
  Se  Se11  1  0.000  0.500  0.500  1.0
[/CIF]
.