The structure described by CeYbSe3 crystallizes in the orthorhombic Cmcm space group. Yb(1) is bonded to two equivalent Se(1) and four equivalent Se(2) atoms to form a mixture of corner and edge-sharing YbSe6 octahedra. The corner-sharing octahedral tilt angles are 63°. Ce(1) is bonded in a 8-coordinate geometry to two equivalent Se(1) and six equivalent Se(2) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Yb(1) and two equivalent Ce(1) atoms to form SeYb2Ce2 tetrahedra that share corners with four equivalent Se(1)Yb2Ce2 tetrahedra, corners with eight equivalent Se(2)Yb2Ce3 trigonal bipyramids, and edges with six equivalent Se(2)Yb2Ce3 trigonal bipyramids. In the second Se site, Se(2) is bonded to two equivalent Yb(1) and three equivalent Ce(1) atoms to form distorted SeYb2Ce3 trigonal bipyramids that share corners with four equivalent Se(1)Yb2Ce2 tetrahedra, corners with nine equivalent Se(2)Yb2Ce3 trigonal bipyramids, edges with three equivalent Se(1)Yb2Ce2 tetrahedra, and edges with six equivalent Se(2)Yb2Ce3 trigonal bipyramids. is represented by the CIF card [CIF]
data_YbCeSe3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.225
_cell_length_b   7.225
_cell_length_c   9.661
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   147.563
_symmetry_Int_Tables_number   1
_cell_volume   270.480
_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
  Yb  Yb0  1  0.000  0.000  0.000  1.0
  Yb  Yb1  1  0.000  0.000  0.500  1.0
  Ce  Ce2  1  0.249  0.751  0.750  1.0
  Ce  Ce3  1  0.751  0.249  0.250  1.0
  Se  Se4  1  0.106  0.894  0.250  1.0
  Se  Se5  1  0.894  0.106  0.750  1.0
  Se  Se6  1  0.650  0.350  0.570  1.0
  Se  Se7  1  0.350  0.650  0.430  1.0
  Se  Se8  1  0.650  0.350  0.930  1.0
  Se  Se9  1  0.350  0.650  0.070  1.0
[/CIF]
.
The structure described by CeYbSe3 crystallizes in the orthorhombic Cmcm space group. Yb(1) is bonded to two equivalent Se(1) and four equivalent Se(2) atoms to form a mixture of corner and edge-sharing YbSe6 octahedra. The corner-sharing octahedral tilt angles are 63°. Ce(1) is bonded in a 8-coordinate geometry to two equivalent Se(1) and six equivalent Se(2) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Yb(1) and two equivalent Ce(1) atoms to form SeYb2Ce2 tetrahedra that share corners with four equivalent Se(1)Yb2Ce2 tetrahedra, corners with eight equivalent Se(2)Yb2Ce3 trigonal bipyramids, and edges with six equivalent Se(2)Yb2Ce3 trigonal bipyramids. In the second Se site, Se(2) is bonded to two equivalent Yb(1) and three equivalent Ce(1) atoms to form distorted SeYb2Ce3 trigonal bipyramids that share corners with four equivalent Se(1)Yb2Ce2 tetrahedra, corners with nine equivalent Se(2)Yb2Ce3 trigonal bipyramids, edges with three equivalent Se(1)Yb2Ce2 tetrahedra, and edges with six equivalent Se(2)Yb2Ce3 trigonal bipyramids. is represented by the CIF card [CIF]
data_YbCeSe3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.225
_cell_length_b   7.225
_cell_length_c   9.661
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   147.563
_symmetry_Int_Tables_number   1
_cell_volume   270.480
_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
  Yb  Yb0  1  0.000  0.000  0.000  1.0
  Yb  Yb1  1  0.000  0.000  0.500  1.0
  Ce  Ce2  1  0.249  0.751  0.750  1.0
  Ce  Ce3  1  0.751  0.249  0.250  1.0
  Se  Se4  1  0.106  0.894  0.250  1.0
  Se  Se5  1  0.894  0.106  0.750  1.0
  Se  Se6  1  0.650  0.350  0.570  1.0
  Se  Se7  1  0.350  0.650  0.430  1.0
  Se  Se8  1  0.650  0.350  0.930  1.0
  Se  Se9  1  0.350  0.650  0.070  1.0
[/CIF]
.