The material structure described by Pr4(SiS4)3 crystallizes in the trigonal R3c space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 9-coordinate geometry to three equivalent S(3) and six equivalent S(2) atoms. In the second Pr site, Pr(2) is bonded in a 7-coordinate geometry to one S(2), two equivalent S(3), two equivalent S(4), and three equivalent S(1) atoms. Si(1) is bonded in a tetrahedral geometry to one S(1), one S(2), one S(3), and one S(4) atom. There are four inequivalent S sites. In the first S site, S(1) is bonded in a 4-coordinate geometry to three equivalent Pr(2) and one Si(1) atom. In the second S site, S(2) is bonded to one Pr(2), two equivalent Pr(1), and one Si(1) atom to form a mixture of distorted edge and corner-sharing SPr3Si tetrahedra. In the third S site, S(3) is bonded in a 4-coordinate geometry to one Pr(1), two equivalent Pr(2), and one Si(1) atom. In the fourth S site, S(4) is bonded in a 3-coordinate geometry to two equivalent Pr(2) and one Si(1) atom. is represented by the CIF card [CIF]
data_Pr4(SiS4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.451
_cell_length_b   11.451
_cell_length_c   11.451
_cell_angle_alpha   114.735
_cell_angle_beta   114.735
_cell_angle_gamma   114.735
_symmetry_Int_Tables_number   1
_cell_volume   860.211
_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
  Pr  Pr0  1  0.503  0.503  0.503  1.0
  Pr  Pr1  1  0.003  0.003  0.003  1.0
  Pr  Pr2  1  0.068  0.293  0.528  1.0
  Pr  Pr3  1  0.293  0.528  0.068  1.0
  Pr  Pr4  1  0.528  0.068  0.293  1.0
  Pr  Pr5  1  0.568  0.028  0.793  1.0
  Pr  Pr6  1  0.028  0.793  0.568  1.0
  Pr  Pr7  1  0.793  0.568  0.028  1.0
  Si  Si8  1  0.361  0.147  0.532  1.0
  Si  Si9  1  0.147  0.532  0.361  1.0
  Si  Si10  1  0.532  0.361  0.147  1.0
  Si  Si11  1  0.861  0.032  0.647  1.0
  Si  Si12  1  0.032  0.647  0.861  1.0
  Si  Si13  1  0.647  0.861  0.032  1.0
  S  S14  1  0.106  0.180  0.715  1.0
  S  S15  1  0.180  0.715  0.106  1.0
  S  S16  1  0.715  0.106  0.180  1.0
  S  S17  1  0.606  0.215  0.680  1.0
  S  S18  1  0.215  0.680  0.606  1.0
  S  S19  1  0.680  0.606  0.215  1.0
  S  S20  1  0.314  0.128  0.319  1.0
  S  S21  1  0.128  0.319  0.314  1.0
  S  S22  1  0.319  0.314  0.128  1.0
  S  S23  1  0.814  0.819  0.628  1.0
  S  S24  1  0.819  0.628  0.814  1.0
  S  S25  1  0.628  0.814  0.819  1.0
  S  S26  1  0.413  0.377  0.697  1.0
  S  S27  1  0.377  0.697  0.413  1.0
  S  S28  1  0.697  0.413  0.377  1.0
  S  S29  1  0.913  0.197  0.877  1.0
  S  S30  1  0.197  0.877  0.913  1.0
  S  S31  1  0.877  0.913  0.197  1.0
  S  S32  1  0.655  0.923  0.388  1.0
  S  S33  1  0.923  0.388  0.655  1.0
  S  S34  1  0.388  0.655  0.923  1.0
  S  S35  1  0.155  0.888  0.423  1.0
  S  S36  1  0.888  0.423  0.155  1.0
  S  S37  1  0.423  0.155  0.888  1.0
[/CIF]
.
The material structure described by Pr4(SiS4)3 crystallizes in the trigonal R3c space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 9-coordinate geometry to three equivalent S(3) and six equivalent S(2) atoms. In the second Pr site, Pr(2) is bonded in a 7-coordinate geometry to one S(2), two equivalent S(3), two equivalent S(4), and three equivalent S(1) atoms. Si(1) is bonded in a tetrahedral geometry to one S(1), one S(2), one S(3), and one S(4) atom. There are four inequivalent S sites. In the first S site, S(1) is bonded in a 4-coordinate geometry to three equivalent Pr(2) and one Si(1) atom. In the second S site, S(2) is bonded to one Pr(2), two equivalent Pr(1), and one Si(1) atom to form a mixture of distorted edge and corner-sharing SPr3Si tetrahedra. In the third S site, S(3) is bonded in a 4-coordinate geometry to one Pr(1), two equivalent Pr(2), and one Si(1) atom. In the fourth S site, S(4) is bonded in a 3-coordinate geometry to two equivalent Pr(2) and one Si(1) atom. is represented by the CIF card [CIF]
data_Pr4(SiS4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.451
_cell_length_b   11.451
_cell_length_c   11.451
_cell_angle_alpha   114.735
_cell_angle_beta   114.735
_cell_angle_gamma   114.735
_symmetry_Int_Tables_number   1
_cell_volume   860.211
_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
  Pr  Pr0  1  0.503  0.503  0.503  1.0
  Pr  Pr1  1  0.003  0.003  0.003  1.0
  Pr  Pr2  1  0.068  0.293  0.528  1.0
  Pr  Pr3  1  0.293  0.528  0.068  1.0
  Pr  Pr4  1  0.528  0.068  0.293  1.0
  Pr  Pr5  1  0.568  0.028  0.793  1.0
  Pr  Pr6  1  0.028  0.793  0.568  1.0
  Pr  Pr7  1  0.793  0.568  0.028  1.0
  Si  Si8  1  0.361  0.147  0.532  1.0
  Si  Si9  1  0.147  0.532  0.361  1.0
  Si  Si10  1  0.532  0.361  0.147  1.0
  Si  Si11  1  0.861  0.032  0.647  1.0
  Si  Si12  1  0.032  0.647  0.861  1.0
  Si  Si13  1  0.647  0.861  0.032  1.0
  S  S14  1  0.106  0.180  0.715  1.0
  S  S15  1  0.180  0.715  0.106  1.0
  S  S16  1  0.715  0.106  0.180  1.0
  S  S17  1  0.606  0.215  0.680  1.0
  S  S18  1  0.215  0.680  0.606  1.0
  S  S19  1  0.680  0.606  0.215  1.0
  S  S20  1  0.314  0.128  0.319  1.0
  S  S21  1  0.128  0.319  0.314  1.0
  S  S22  1  0.319  0.314  0.128  1.0
  S  S23  1  0.814  0.819  0.628  1.0
  S  S24  1  0.819  0.628  0.814  1.0
  S  S25  1  0.628  0.814  0.819  1.0
  S  S26  1  0.413  0.377  0.697  1.0
  S  S27  1  0.377  0.697  0.413  1.0
  S  S28  1  0.697  0.413  0.377  1.0
  S  S29  1  0.913  0.197  0.877  1.0
  S  S30  1  0.197  0.877  0.913  1.0
  S  S31  1  0.877  0.913  0.197  1.0
  S  S32  1  0.655  0.923  0.388  1.0
  S  S33  1  0.923  0.388  0.655  1.0
  S  S34  1  0.388  0.655  0.923  1.0
  S  S35  1  0.155  0.888  0.423  1.0
  S  S36  1  0.888  0.423  0.155  1.0
  S  S37  1  0.423  0.155  0.888  1.0
[/CIF]
.