data_Sr3U
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.04
_cell_length_b   8.04
_cell_length_c   6.49
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sr3U
_chemical_formula_sum   'Sr6 U2'
_cell_volume   363.56
_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
  Sr  Sr0  1  0.0  0.4  0.87  1.0
  Sr  Sr1  1  0.94  0.77  0.87  1.0
  Sr  Sr2  1  0.06  0.77  0.87  1.0
  Sr  Sr3  1  0.02  0.57  0.62  1.0
  Sr  Sr4  1  0.08  0.2  0.62  1.0
  Sr  Sr5  1  0.97  0.2  0.62  1.0
  U  U6  1  0.0  0.64  0.62  1.0
  U  U7  1  0.02  0.32  0.87  1.0

data_Sr3U
_symmetry_space_group_name_H-M   P-1
_cell_length_a   6.49
_cell_length_b   8.04
_cell_length_c   8.04
_cell_angle_alpha   120.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   Sr3U
_chemical_formula_sum   'Sr6 U2'
_cell_volume   363.56
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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
  Sr  Sr0  2  0.38  0.01  0.08  1.0
  Sr  Sr1  2  0.38  0.07  0.72  1.0
  Sr  Sr2  2  0.38  0.96  0.72  1.0
  U  U3  2  0.38  0.99  0.16  1.0

Sr Sr Sr Sr Sr Sr U U
Sr3U crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of two Sr3U clusters. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a single-bond geometry to one U(1) atom. The Sr(1)-U(1) bond length is 0.72 Å. In the second Sr site, Sr(2) is bonded in a distorted single-bond geometry to one Sr(3) atom. The Sr(2)-Sr(3) bond length is 0.89 Å. In the third Sr site, Sr(3) is bonded in an L-shaped geometry to one Sr(2) and one U(1) atom. The Sr(3)-U(1) bond length is 1.80 Å. U(1) is bonded in a 1-coordinate geometry to one Sr(1) and one Sr(3) atom.