data_RbU2Ti
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.16
_cell_length_b   5.16
_cell_length_c   5.16
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   RbU2Ti
_chemical_formula_sum   'Rb1 U2 Ti1'
_cell_volume   97.03
_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  Rb0  1  0.65  0.65  0.65  1.0
  U  U2  1  0.47  0.47  0.47  1.0
  U  U3  1  0.82  0.82  0.82  1.0
  Ti  Ti1  1  0.0  0.0  0.0  1.0

data_RbU2Ti
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.16
_cell_length_b   5.16
_cell_length_c   12.63
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   RbU2Ti
_chemical_formula_sum   'Rb3 U6 Ti3'
_cell_volume   291.08
_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  0.35  1.0
  U  U1  3  0.0  0.0  0.18  1.0
  U  U2  3  0.0  0.0  0.53  1.0
  Ti  Ti3  3  0.0  0.0  -0.0  1.0

Rb U U Ti
Rb U U Ti 0 1 o o o 0 2 o o o 2 3 + + + 
RbU2Ti crystallizes in the trigonal R3m space group. Rb(1) is bonded to one U(1), one U(2), and three equivalent Ti(1) atoms to form distorted RbU2Ti3 trigonal bipyramids that share corners with six equivalent Rb(1)U2Ti3 trigonal bipyramids and  a cornercorner with one Ti(1)Rb3U trigonal pyramid. The Rb(1)-U(1) bond length is 2.23 Å. The Rb(1)-U(2) bond length is 2.23 Å. All Rb(1)-Ti(1) bond lengths are 2.99 Å. There are two inequivalent U sites. In the first U site, U(1) is bonded in a single-bond geometry to one Rb(1) atom. In the second U site, U(2) is bonded in a distorted linear geometry to one Rb(1) and one Ti(1) atom. The U(2)-Ti(1) bond length is 2.23 Å. Ti(1) is bonded to three equivalent Rb(1) and one U(2) atom to form distorted TiRb3U trigonal pyramids that share  a cornercorner with one Rb(1)U2Ti3 trigonal bipyramid and corners with six equivalent Ti(1)Rb3U trigonal pyramids.