data_PrSi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.42
_cell_length_b   3.42
_cell_length_c   4.15
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   PrSi
_chemical_formula_sum   'Pr1 Si1'
_cell_volume   48.51
_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
  Pr  Pr0  1  0.71  0.71  0.07  1.0
  Si  Si1  1  0.0  0.0  0.0  1.0

data_PrSi
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.84
_cell_length_b   4.84
_cell_length_c   4.15
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   PrSi
_chemical_formula_sum   'Pr2 Si2'
_cell_volume   97.01
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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  2  0.21  0.5  0.07  1.0
  Si  Si1  2  0.0  0.0  0.0  1.0

Pr Si
Pr Si 0 1 + + o 
PrSi is alpha Po structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two PrSi clusters. Pr(1) is bonded in a distorted single-bond geometry to one Si(1) atom. The Pr(1)-Si(1) bond length is 1.43 Å. Si(1) is bonded in a distorted single-bond geometry to one Pr(1) atom.