data_Pr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.56
_cell_length_b   6.56
_cell_length_c   6.56
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Pr
_chemical_formula_sum   Pr8
_cell_volume   282.85
_cell_formula_units_Z   8
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
  Pr  Pr0  1  0.0  0.0  0.0  1.0
  Pr  Pr1  1  0.28  0.64  0.0  1.0
  Pr  Pr2  1  0.28  0.92  0.0  1.0
  Pr  Pr3  1  0.0  0.28  0.64  1.0
  Pr  Pr4  1  0.64  0.0  0.28  1.0
  Pr  Pr5  1  0.92  0.0  0.28  1.0
  Pr  Pr6  1  0.28  0.28  0.28  1.0
  Pr  Pr7  1  0.0  0.28  0.92  1.0

data_Pr
_symmetry_space_group_name_H-M   R3
_cell_length_a   9.28
_cell_length_b   9.28
_cell_length_c   11.37
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   146
_chemical_formula_structural   Pr
_chemical_formula_sum   Pr24
_cell_volume   848.56
_cell_formula_units_Z   24
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  'x+1/3, y+2/3, z+2/3'
  5  '-y+1/3, x-y+2/3, z+2/3'
  6  '-x+y+1/3, -x+2/3, z+2/3'
  7  'x+2/3, y+1/3, z+1/3'
  8  '-y+2/3, x-y+1/3, z+1/3'
  9  '-x+y+2/3, -x+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
  Pr  Pr0  9  0.03  0.33  0.97  1.0
  Pr  Pr1  9  0.19  0.45  0.74  1.0
  Pr  Pr2  3  0.0  0.0  0.0  1.0
  Pr  Pr3  3  0.0  0.0  0.28  1.0

Pr Pr Pr Pr Pr Pr Pr Pr
Pr crystallizes in the trigonal R3 space group. There are four inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a trigonal non-coplanar geometry to three equivalent Pr(3) atoms. All Pr(1)-Pr(3) bond lengths are 1.92 Å. In the second Pr site, Pr(2) is bonded in a distorted single-bond geometry to one Pr(3) and one Pr(4) atom. The Pr(2)-Pr(3) bond length is 1.85 Å. The Pr(2)-Pr(4) bond length is 3.00 Å. In the third Pr site, Pr(3) is bonded in a distorted water-like geometry to one Pr(1), one Pr(2), and one Pr(4) atom. The Pr(3)-Pr(4) bond length is 3.00 Å. In the fourth Pr site, Pr(4) is bonded in a 6-coordinate geometry to three equivalent Pr(2) and three equivalent Pr(3) atoms.