The material structure described by Rb2CeO3 crystallizes in the monoclinic C2/m space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form distorted RbO6 octahedra that share corners with two equivalent Rb(2)O6 octahedra, corners with four equivalent Ce(1)O6 octahedra, edges with two equivalent Rb(2)O6 octahedra, and edges with four equivalent Ce(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-24°. In the second Rb site, Rb(2) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form distorted RbO6 octahedra that share corners with two equivalent Rb(1)O6 octahedra, edges with two equivalent Rb(1)O6 octahedra, and edges with six equivalent Ce(1)O6 octahedra. The corner-sharing octahedral tilt angles are 24°. In the third Rb site, Rb(3) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. Ce(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form distorted CeO6 octahedra that share corners with two equivalent Rb(1)O6 octahedra, edges with two equivalent Rb(1)O6 octahedra, edges with three equivalent Rb(2)O6 octahedra, and edges with three equivalent Ce(1)O6 octahedra. The corner-sharing octahedral tilt angles are 18°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Rb(1), one Rb(2), two equivalent Rb(3), and two equivalent Ce(1) atoms. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Rb(1), one Rb(2), two equivalent Rb(3), and two equivalent Ce(1) atoms. is represented by the CIF card [CIF]
data_Rb2CeO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.356
_cell_length_b   6.356
_cell_length_c   6.908
_cell_angle_alpha   80.985
_cell_angle_beta   80.985
_cell_angle_gamma   119.820
_symmetry_Int_Tables_number   1
_cell_volume   230.041
_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
  Rb  Rb0  1  0.000  0.000  0.000  1.0
  Rb  Rb1  1  0.500  0.500  0.500  1.0
  Rb  Rb2  1  0.656  0.344  0.000  1.0
  Rb  Rb3  1  0.344  0.656  0.000  1.0
  Ce  Ce4  1  0.167  0.833  0.500  1.0
  Ce  Ce5  1  0.833  0.167  0.500  1.0
  O  O6  1  0.166  0.166  0.316  1.0
  O  O7  1  0.963  0.564  0.313  1.0
  O  O8  1  0.564  0.963  0.313  1.0
  O  O9  1  0.436  0.037  0.687  1.0
  O  O10  1  0.037  0.436  0.687  1.0
  O  O11  1  0.834  0.834  0.684  1.0
[/CIF]
.
The material structure described by Rb2CeO3 crystallizes in the monoclinic C2/m space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form distorted RbO6 octahedra that share corners with two equivalent Rb(2)O6 octahedra, corners with four equivalent Ce(1)O6 octahedra, edges with two equivalent Rb(2)O6 octahedra, and edges with four equivalent Ce(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-24°. In the second Rb site, Rb(2) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form distorted RbO6 octahedra that share corners with two equivalent Rb(1)O6 octahedra, edges with two equivalent Rb(1)O6 octahedra, and edges with six equivalent Ce(1)O6 octahedra. The corner-sharing octahedral tilt angles are 24°. In the third Rb site, Rb(3) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. Ce(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form distorted CeO6 octahedra that share corners with two equivalent Rb(1)O6 octahedra, edges with two equivalent Rb(1)O6 octahedra, edges with three equivalent Rb(2)O6 octahedra, and edges with three equivalent Ce(1)O6 octahedra. The corner-sharing octahedral tilt angles are 18°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Rb(1), one Rb(2), two equivalent Rb(3), and two equivalent Ce(1) atoms. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Rb(1), one Rb(2), two equivalent Rb(3), and two equivalent Ce(1) atoms. is represented by the CIF card [CIF]
data_Rb2CeO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.356
_cell_length_b   6.356
_cell_length_c   6.908
_cell_angle_alpha   80.985
_cell_angle_beta   80.985
_cell_angle_gamma   119.820
_symmetry_Int_Tables_number   1
_cell_volume   230.041
_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
  Rb  Rb0  1  0.000  0.000  0.000  1.0
  Rb  Rb1  1  0.500  0.500  0.500  1.0
  Rb  Rb2  1  0.656  0.344  0.000  1.0
  Rb  Rb3  1  0.344  0.656  0.000  1.0
  Ce  Ce4  1  0.167  0.833  0.500  1.0
  Ce  Ce5  1  0.833  0.167  0.500  1.0
  O  O6  1  0.166  0.166  0.316  1.0
  O  O7  1  0.963  0.564  0.313  1.0
  O  O8  1  0.564  0.963  0.313  1.0
  O  O9  1  0.436  0.037  0.687  1.0
  O  O10  1  0.037  0.436  0.687  1.0
  O  O11  1  0.834  0.834  0.684  1.0
[/CIF]
.