The compound described by CeSe2 crystallizes in the monoclinic Cc space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to one Se(1), one Se(4), and two equivalent Se(2) atoms to form corner-sharing CeSe4 tetrahedra. In the second Ce site, Ce(2) is bonded to one Se(1), one Se(4), and two equivalent Se(3) atoms to form corner-sharing CeSe4 tetrahedra. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(2) atom. In the second Se site, Se(2) is bonded in a bent 120 degrees geometry to two equivalent Ce(1) atoms. In the third Se site, Se(3) is bonded in a bent 150 degrees geometry to two equivalent Ce(2) atoms. In the fourth Se site, Se(4) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_CeSe2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.800
_cell_length_b   8.800
_cell_length_c   9.075
_cell_angle_alpha   83.538
_cell_angle_beta   83.538
_cell_angle_gamma   101.395
_symmetry_Int_Tables_number   1
_cell_volume   677.870
_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  0.043  0.964  0.999  1.0
  Ce  Ce1  1  0.964  0.043  0.499  1.0
  Ce  Ce2  1  0.366  0.537  0.915  1.0
  Ce  Ce3  1  0.537  0.366  0.415  1.0
  Se  Se4  1  0.281  0.124  0.472  1.0
  Se  Se5  1  0.124  0.281  0.972  1.0
  Se  Se6  1  0.889  0.861  0.282  1.0
  Se  Se7  1  0.861  0.889  0.782  1.0
  Se  Se8  1  0.488  0.560  0.622  1.0
  Se  Se9  1  0.560  0.488  0.122  1.0
  Se  Se10  1  0.284  0.812  0.960  1.0
  Se  Se11  1  0.812  0.284  0.460  1.0
[/CIF]
.
The compound described by CeSe2 crystallizes in the monoclinic Cc space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to one Se(1), one Se(4), and two equivalent Se(2) atoms to form corner-sharing CeSe4 tetrahedra. In the second Ce site, Ce(2) is bonded to one Se(1), one Se(4), and two equivalent Se(3) atoms to form corner-sharing CeSe4 tetrahedra. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(2) atom. In the second Se site, Se(2) is bonded in a bent 120 degrees geometry to two equivalent Ce(1) atoms. In the third Se site, Se(3) is bonded in a bent 150 degrees geometry to two equivalent Ce(2) atoms. In the fourth Se site, Se(4) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_CeSe2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.800
_cell_length_b   8.800
_cell_length_c   9.075
_cell_angle_alpha   83.538
_cell_angle_beta   83.538
_cell_angle_gamma   101.395
_symmetry_Int_Tables_number   1
_cell_volume   677.870
_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  0.043  0.964  0.999  1.0
  Ce  Ce1  1  0.964  0.043  0.499  1.0
  Ce  Ce2  1  0.366  0.537  0.915  1.0
  Ce  Ce3  1  0.537  0.366  0.415  1.0
  Se  Se4  1  0.281  0.124  0.472  1.0
  Se  Se5  1  0.124  0.281  0.972  1.0
  Se  Se6  1  0.889  0.861  0.282  1.0
  Se  Se7  1  0.861  0.889  0.782  1.0
  Se  Se8  1  0.488  0.560  0.622  1.0
  Se  Se9  1  0.560  0.488  0.122  1.0
  Se  Se10  1  0.284  0.812  0.960  1.0
  Se  Se11  1  0.812  0.284  0.460  1.0
[/CIF]
.