data_Rb2CeU
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.51
_cell_length_b   6.51
_cell_length_c   6.51
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Rb2CeU
_chemical_formula_sum   'Rb2 Ce1 U1'
_cell_volume   194.9
_cell_formula_units_Z   1
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  Rb1  1  0.9  0.9  0.9  1.0
  Rb  Rb2  1  0.3  0.3  0.3  1.0
  Ce  Ce0  1  0.0  0.0  0.0  1.0
  U  U3  1  0.6  0.6  0.6  1.0

data_Rb2CeU
_symmetry_space_group_name_H-M   R3m
_cell_length_a   6.51
_cell_length_b   6.51
_cell_length_c   15.94
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   Rb2CeU
_chemical_formula_sum   'Rb6 Ce3 U3'
_cell_volume   584.7
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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  3  0.0  0.0  0.1  1.0
  Rb  Rb1  3  0.0  0.0  0.7  1.0
  Ce  Ce2  3  0.0  0.0  0.0  1.0
  U  U3  3  0.0  0.0  0.4  1.0

Rb Rb Ce U
Rb Rb Ce U 0 2 + + + 0 1 + + o 0 1 + o + 0 1 o + + 0 3 + o o 0 3 o + o 0 3 o o + 1 2 o o + 1 2 o + o 1 2 + o o 1 3 - o o 1 3 o - o 1 3 o o - 2 3 o - - 2 3 - o - 2 3 - - o 
Rb2UCe crystallizes in the trigonal R3m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a single-bond geometry to three equivalent Rb(2), four equivalent U(1), and one Ce(1) atom. All Rb(1)-Rb(2) bond lengths are 3.90 Å. There are three shorter (3.79 Å) and one longer (4.80 Å) Rb(1)-U(1) bond length. The Rb(1)-Ce(1) bond length is 1.55 Å. In the second Rb site, Rb(2) is bonded in a 11-coordinate geometry to three equivalent Rb(1), four equivalent U(1), and four equivalent Ce(1) atoms. There are three shorter (3.79 Å) and one longer (4.80 Å) Rb(2)-U(1) bond length. There are three shorter (3.79 Å) and one longer (4.80 Å) Rb(2)-Ce(1) bond length. U(1) is bonded in a 11-coordinate geometry to four equivalent Rb(1), four equivalent Rb(2), and three equivalent Ce(1) atoms. All U(1)-Ce(1) bond lengths are 3.90 Å. Ce(1) is bonded in a single-bond geometry to one Rb(1), four equivalent Rb(2), and three equivalent U(1) atoms.