data_Rb2CeSn
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.2
_cell_length_b   6.2
_cell_length_c   6.2
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Rb2CeSn
_chemical_formula_sum   'Rb2 Ce1 Sn1'
_cell_volume   168.39
_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  0.19  0.19  0.19  1.0
  Rb  Rb2  1  0.57  0.57  0.57  1.0
  Ce  Ce0  1  0.38  0.38  0.38  1.0
  Sn  Sn3  1  0.0  0.0  0.0  1.0

data_Rb2CeSn
_symmetry_space_group_name_H-M   R3m
_cell_length_a   6.2
_cell_length_b   6.2
_cell_length_c   15.18
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   Rb2CeSn
_chemical_formula_sum   'Rb6 Ce3 Sn3'
_cell_volume   505.18
_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  0.43  1.0
  Rb  Rb1  3  0.0  0.0  0.81  1.0
  Ce  Ce2  3  0.0  0.0  0.62  1.0
  Sn  Sn3  3  0.0  0.0  -0.0  1.0

Rb Rb Ce Sn
Rb Rb Ce Sn 0 3 o o o 0 2 o o o 0 1 o o - 0 1 o - o 0 1 - o o 1 2 o o o 1 3 o + + 1 3 + o + 1 3 + + o 2 3 + o o 2 3 o + o 2 3 o o + 
Rb2CeSn crystallizes in the trigonal R3m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a distorted linear geometry to one Ce(1) and one Sn(1) atom. The Rb(1)-Ce(1) bond length is 2.91 Å. The Rb(1)-Sn(1) bond length is 2.91 Å. In the second Rb site, Rb(2) is bonded to one Ce(1) and three equivalent Sn(1) atoms to form distorted corner-sharing RbCeSn3 tetrahedra. The Rb(2)-Ce(1) bond length is 2.91 Å. All Rb(2)-Sn(1) bond lengths are 3.84 Å. Ce(1) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(2), and three equivalent Sn(1) atoms. All Ce(1)-Sn(1) bond lengths are 3.66 Å. Sn(1) is bonded in a distorted single-bond geometry to one Rb(1), three equivalent Rb(2), and three equivalent Ce(1) atoms.