The structure described by CeSe2 is Low Tridymite-like structured and crystallizes in the orthorhombic Pbam space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to one Se(1), one Se(3), one Se(4), and one Se(5) atom to form corner-sharing CeSe4 tetrahedra. In the second Ce site, Ce(2) is bonded to one Se(2), one Se(3), one Se(4), and one Se(5) atom to form corner-sharing CeSe4 tetrahedra. There are five inequivalent Se sites. In the first Se site, Se(4) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(2) atom. In the second Se site, Se(5) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(2) atom. In the third Se site, Se(1) is bonded in a bent 150 degrees geometry to two equivalent Ce(1) atoms. In the fourth Se site, Se(2) is bonded in a bent 150 degrees geometry to two equivalent Ce(2) atoms. In the fifth Se site, Se(3) 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   14.127
_cell_length_b   16.449
_cell_length_c   16.480
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   3829.483
_cell_formula_units_Z   16
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  0.313  0.670  0.379  1.0
  Ce  Ce1  1  0.313  0.330  0.621  1.0
  Ce  Ce2  1  0.687  0.170  0.121  1.0
  Ce  Ce3  1  0.687  0.830  0.879  1.0
  Ce  Ce4  1  0.687  0.330  0.621  1.0
  Ce  Ce5  1  0.687  0.670  0.379  1.0
  Ce  Ce6  1  0.313  0.830  0.879  1.0
  Ce  Ce7  1  0.313  0.170  0.121  1.0
  Ce  Ce8  1  0.187  0.879  0.170  1.0
  Ce  Ce9  1  0.187  0.121  0.830  1.0
  Ce  Ce10  1  0.813  0.379  0.330  1.0
  Ce  Ce11  1  0.813  0.621  0.670  1.0
  Ce  Ce12  1  0.813  0.121  0.830  1.0
  Ce  Ce13  1  0.813  0.879  0.170  1.0
  Ce  Ce14  1  0.187  0.621  0.670  1.0
  Ce  Ce15  1  0.187  0.379  0.330  1.0
  Se  Se16  1  0.500  0.351  0.646  1.0
  Se  Se17  1  0.500  0.649  0.354  1.0
  Se  Se18  1  0.500  0.851  0.854  1.0
  Se  Se19  1  0.500  0.149  0.146  1.0
  Se  Se20  1  0.000  0.147  0.849  1.0
  Se  Se21  1  0.000  0.853  0.151  1.0
  Se  Se22  1  0.000  0.647  0.651  1.0
  Se  Se23  1  0.000  0.353  0.349  1.0
  Se  Se24  1  0.251  0.806  0.306  1.0
  Se  Se25  1  0.251  0.194  0.694  1.0
  Se  Se26  1  0.749  0.306  0.194  1.0
  Se  Se27  1  0.749  0.694  0.806  1.0
  Se  Se28  1  0.749  0.194  0.694  1.0
  Se  Se29  1  0.749  0.806  0.306  1.0
  Se  Se30  1  0.251  0.694  0.806  1.0
  Se  Se31  1  0.251  0.306  0.194  1.0
  Se  Se32  1  0.220  0.540  0.317  1.0
  Se  Se33  1  0.220  0.460  0.683  1.0
  Se  Se34  1  0.780  0.040  0.183  1.0
  Se  Se35  1  0.780  0.960  0.817  1.0
  Se  Se36  1  0.780  0.460  0.683  1.0
  Se  Se37  1  0.780  0.540  0.317  1.0
  Se  Se38  1  0.220  0.960  0.817  1.0
  Se  Se39  1  0.220  0.040  0.183  1.0
  Se  Se40  1  0.279  0.816  0.040  1.0
  Se  Se41  1  0.279  0.184  0.960  1.0
  Se  Se42  1  0.721  0.316  0.460  1.0
  Se  Se43  1  0.721  0.684  0.540  1.0
  Se  Se44  1  0.721  0.184  0.960  1.0
  Se  Se45  1  0.721  0.816  0.040  1.0
  Se  Se46  1  0.279  0.684  0.540  1.0
  Se  Se47  1  0.279  0.316  0.460  1.0
[/CIF]
.
The structure described by CeSe2 is Low Tridymite-like structured and crystallizes in the orthorhombic Pbam space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to one Se(1), one Se(3), one Se(4), and one Se(5) atom to form corner-sharing CeSe4 tetrahedra. In the second Ce site, Ce(2) is bonded to one Se(2), one Se(3), one Se(4), and one Se(5) atom to form corner-sharing CeSe4 tetrahedra. There are five inequivalent Se sites. In the first Se site, Se(4) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(2) atom. In the second Se site, Se(5) is bonded in a bent 150 degrees geometry to one Ce(1) and one Ce(2) atom. In the third Se site, Se(1) is bonded in a bent 150 degrees geometry to two equivalent Ce(1) atoms. In the fourth Se site, Se(2) is bonded in a bent 150 degrees geometry to two equivalent Ce(2) atoms. In the fifth Se site, Se(3) 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   14.127
_cell_length_b   16.449
_cell_length_c   16.480
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   3829.483
_cell_formula_units_Z   16
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  0.313  0.670  0.379  1.0
  Ce  Ce1  1  0.313  0.330  0.621  1.0
  Ce  Ce2  1  0.687  0.170  0.121  1.0
  Ce  Ce3  1  0.687  0.830  0.879  1.0
  Ce  Ce4  1  0.687  0.330  0.621  1.0
  Ce  Ce5  1  0.687  0.670  0.379  1.0
  Ce  Ce6  1  0.313  0.830  0.879  1.0
  Ce  Ce7  1  0.313  0.170  0.121  1.0
  Ce  Ce8  1  0.187  0.879  0.170  1.0
  Ce  Ce9  1  0.187  0.121  0.830  1.0
  Ce  Ce10  1  0.813  0.379  0.330  1.0
  Ce  Ce11  1  0.813  0.621  0.670  1.0
  Ce  Ce12  1  0.813  0.121  0.830  1.0
  Ce  Ce13  1  0.813  0.879  0.170  1.0
  Ce  Ce14  1  0.187  0.621  0.670  1.0
  Ce  Ce15  1  0.187  0.379  0.330  1.0
  Se  Se16  1  0.500  0.351  0.646  1.0
  Se  Se17  1  0.500  0.649  0.354  1.0
  Se  Se18  1  0.500  0.851  0.854  1.0
  Se  Se19  1  0.500  0.149  0.146  1.0
  Se  Se20  1  0.000  0.147  0.849  1.0
  Se  Se21  1  0.000  0.853  0.151  1.0
  Se  Se22  1  0.000  0.647  0.651  1.0
  Se  Se23  1  0.000  0.353  0.349  1.0
  Se  Se24  1  0.251  0.806  0.306  1.0
  Se  Se25  1  0.251  0.194  0.694  1.0
  Se  Se26  1  0.749  0.306  0.194  1.0
  Se  Se27  1  0.749  0.694  0.806  1.0
  Se  Se28  1  0.749  0.194  0.694  1.0
  Se  Se29  1  0.749  0.806  0.306  1.0
  Se  Se30  1  0.251  0.694  0.806  1.0
  Se  Se31  1  0.251  0.306  0.194  1.0
  Se  Se32  1  0.220  0.540  0.317  1.0
  Se  Se33  1  0.220  0.460  0.683  1.0
  Se  Se34  1  0.780  0.040  0.183  1.0
  Se  Se35  1  0.780  0.960  0.817  1.0
  Se  Se36  1  0.780  0.460  0.683  1.0
  Se  Se37  1  0.780  0.540  0.317  1.0
  Se  Se38  1  0.220  0.960  0.817  1.0
  Se  Se39  1  0.220  0.040  0.183  1.0
  Se  Se40  1  0.279  0.816  0.040  1.0
  Se  Se41  1  0.279  0.184  0.960  1.0
  Se  Se42  1  0.721  0.316  0.460  1.0
  Se  Se43  1  0.721  0.684  0.540  1.0
  Se  Se44  1  0.721  0.184  0.960  1.0
  Se  Se45  1  0.721  0.816  0.040  1.0
  Se  Se46  1  0.279  0.684  0.540  1.0
  Se  Se47  1  0.279  0.316  0.460  1.0
[/CIF]
.