The structure described by Pr3Ni2Sn7 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a square co-planar geometry to two equivalent Sn(1) and two equivalent Sn(3) atoms. In the second Pr site, Pr(2) is bonded in a 10-coordinate geometry to two equivalent Sn(2), two equivalent Sn(3), and six equivalent Sn(4) atoms. Ni(1) is bonded in a 5-coordinate geometry to one Sn(4), two equivalent Sn(2), and two equivalent Sn(3) atoms. There are four inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a linear geometry to two equivalent Pr(1) and four equivalent Sn(2) atoms. In the second Sn site, Sn(2) is bonded in a 6-coordinate geometry to two equivalent Pr(2), two equivalent Ni(1), and two equivalent Sn(1) atoms. In the third Sn site, Sn(3) is bonded in a 5-coordinate geometry to one Pr(1), two equivalent Pr(2), and two equivalent Ni(1) atoms. In the fourth Sn site, Sn(4) is bonded in a 9-coordinate geometry to six equivalent Pr(2), one Ni(1), and two equivalent Sn(4) atoms. is represented by the CIF file [CIF]
data_Pr3Ni2Sn7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.641
_cell_length_b   5.463
_cell_length_c   14.213
_cell_angle_alpha   90.000
_cell_angle_beta   99.396
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   355.490
_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  0.000  0.500  0.000  1.0
  Pr  Pr1  1  0.189  0.000  0.378  1.0
  Pr  Pr2  1  0.811  0.000  0.622  1.0
  Ni  Ni3  1  0.369  0.500  0.737  1.0
  Ni  Ni4  1  0.631  0.500  0.263  1.0
  Sn  Sn5  1  0.000  0.000  0.000  1.0
  Sn  Sn6  1  0.412  0.000  0.825  1.0
  Sn  Sn7  1  0.588  0.000  0.175  1.0
  Sn  Sn8  1  0.109  0.500  0.218  1.0
  Sn  Sn9  1  0.891  0.500  0.782  1.0
  Sn  Sn10  1  0.281  0.500  0.562  1.0
  Sn  Sn11  1  0.719  0.500  0.438  1.0
[/CIF]
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The structure described by Pr3Ni2Sn7 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a square co-planar geometry to two equivalent Sn(1) and two equivalent Sn(3) atoms. In the second Pr site, Pr(2) is bonded in a 10-coordinate geometry to two equivalent Sn(2), two equivalent Sn(3), and six equivalent Sn(4) atoms. Ni(1) is bonded in a 5-coordinate geometry to one Sn(4), two equivalent Sn(2), and two equivalent Sn(3) atoms. There are four inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a linear geometry to two equivalent Pr(1) and four equivalent Sn(2) atoms. In the second Sn site, Sn(2) is bonded in a 6-coordinate geometry to two equivalent Pr(2), two equivalent Ni(1), and two equivalent Sn(1) atoms. In the third Sn site, Sn(3) is bonded in a 5-coordinate geometry to one Pr(1), two equivalent Pr(2), and two equivalent Ni(1) atoms. In the fourth Sn site, Sn(4) is bonded in a 9-coordinate geometry to six equivalent Pr(2), one Ni(1), and two equivalent Sn(4) atoms. is represented by the CIF file [CIF]
data_Pr3Ni2Sn7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.641
_cell_length_b   5.463
_cell_length_c   14.213
_cell_angle_alpha   90.000
_cell_angle_beta   99.396
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   355.490
_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  0.000  0.500  0.000  1.0
  Pr  Pr1  1  0.189  0.000  0.378  1.0
  Pr  Pr2  1  0.811  0.000  0.622  1.0
  Ni  Ni3  1  0.369  0.500  0.737  1.0
  Ni  Ni4  1  0.631  0.500  0.263  1.0
  Sn  Sn5  1  0.000  0.000  0.000  1.0
  Sn  Sn6  1  0.412  0.000  0.825  1.0
  Sn  Sn7  1  0.588  0.000  0.175  1.0
  Sn  Sn8  1  0.109  0.500  0.218  1.0
  Sn  Sn9  1  0.891  0.500  0.782  1.0
  Sn  Sn10  1  0.281  0.500  0.562  1.0
  Sn  Sn11  1  0.719  0.500  0.438  1.0
[/CIF]
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