The material structure described by Pr2Ni7P4 crystallizes in the orthorhombic Pmn2_1 space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 16-coordinate geometry to one Ni(3), one Ni(4), two equivalent Ni(2), two equivalent Ni(6), two equivalent Ni(7), three equivalent Ni(1), two equivalent P(4), and three equivalent P(1) atoms. In the second Pr site, Pr(2) is bonded in a 17-coordinate geometry to one Ni(3), one Ni(6), one Ni(7), two equivalent Ni(2), three equivalent Ni(4), three equivalent Ni(5), two equivalent P(2), two equivalent P(3), and two equivalent P(4) atoms. There are seven inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Pr(1), one P(2), and two equivalent P(1) atoms. In the second Ni site, Ni(2) is bonded in a 4-coordinate geometry to two equivalent Pr(1), two equivalent Pr(2), one P(3), one P(4), and two equivalent P(1) atoms. In the third Ni site, Ni(3) is bonded in a 3-coordinate geometry to one Pr(1), one Pr(2), one P(3), and two equivalent P(2) atoms. In the fourth Ni site, Ni(4) is bonded to one Pr(1), three equivalent Pr(2), one P(2), one P(3), and two equivalent P(4) atoms to form a mixture of distorted edge and corner-sharing NiPr4P4 tetrahedra. In the fifth Ni site, Ni(5) is bonded in a 4-coordinate geometry to three equivalent Pr(2), one P(2), one P(4), and two equivalent P(3) atoms. In the sixth Ni site, Ni(6) is bonded in a 4-coordinate geometry to one Pr(2), two equivalent Pr(1), one P(1), one P(4), and two equivalent P(2) atoms. In the seventh Ni site, Ni(7) is bonded in a distorted trigonal non-coplanar geometry to one Pr(2), two equivalent Pr(1), one P(1), and two equivalent P(3) atoms. There are four inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to three equivalent Pr(1), one Ni(6), one Ni(7), two equivalent Ni(1), and two equivalent Ni(2) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Pr(2), one Ni(1), one Ni(4), one Ni(5), two equivalent Ni(3), and two equivalent Ni(6) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to two equivalent Pr(2), one Ni(2), one Ni(3), one Ni(4), two equivalent Ni(5), and two equivalent Ni(7) atoms. In the fourth P site, P(4) is bonded in a 9-coordinate geometry to two equivalent Pr(1), two equivalent Pr(2), one Ni(2), one Ni(5), one Ni(6), and two equivalent Ni(4) atoms. is represented by the CIF file [CIF]
data_Pr2Ni7P4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.773
_cell_length_b   9.263
_cell_length_c   10.478
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   366.171
_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  0.000  0.563  0.000  1.0
  Pr  Pr1  1  0.500  0.437  0.500  1.0
  Pr  Pr2  1  0.000  0.939  0.783  1.0
  Pr  Pr3  1  0.500  0.061  0.283  1.0
  Ni  Ni4  1  0.000  0.583  0.304  1.0
  Ni  Ni5  1  0.500  0.417  0.804  1.0
  Ni  Ni6  1  0.000  0.318  0.260  1.0
  Ni  Ni7  1  0.500  0.682  0.760  1.0
  Ni  Ni8  1  0.000  0.253  0.903  1.0
  Ni  Ni9  1  0.500  0.747  0.403  1.0
  Ni  Ni10  1  0.000  0.904  0.086  1.0
  Ni  Ni11  1  0.500  0.096  0.586  1.0
  Ni  Ni12  1  0.000  0.939  0.480  1.0
  Ni  Ni13  1  0.500  0.061  0.980  1.0
  Ni  Ni14  1  0.000  0.275  0.672  1.0
  Ni  Ni15  1  0.500  0.725  0.172  1.0
  Ni  Ni16  1  0.000  0.695  0.575  1.0
  Ni  Ni17  1  0.500  0.305  0.075  1.0
  P  P18  1  0.000  0.524  0.718  1.0
  P  P19  1  0.500  0.476  0.218  1.0
  P  P20  1  0.000  0.816  0.288  1.0
  P  P21  1  0.500  0.184  0.788  1.0
  P  P22  1  0.000  0.157  0.089  1.0
  P  P23  1  0.500  0.843  0.589  1.0
  P  P24  1  0.000  0.185  0.473  1.0
  P  P25  1  0.500  0.815  0.973  1.0
[/CIF]
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The material structure described by Pr2Ni7P4 crystallizes in the orthorhombic Pmn2_1 space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 16-coordinate geometry to one Ni(3), one Ni(4), two equivalent Ni(2), two equivalent Ni(6), two equivalent Ni(7), three equivalent Ni(1), two equivalent P(4), and three equivalent P(1) atoms. In the second Pr site, Pr(2) is bonded in a 17-coordinate geometry to one Ni(3), one Ni(6), one Ni(7), two equivalent Ni(2), three equivalent Ni(4), three equivalent Ni(5), two equivalent P(2), two equivalent P(3), and two equivalent P(4) atoms. There are seven inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Pr(1), one P(2), and two equivalent P(1) atoms. In the second Ni site, Ni(2) is bonded in a 4-coordinate geometry to two equivalent Pr(1), two equivalent Pr(2), one P(3), one P(4), and two equivalent P(1) atoms. In the third Ni site, Ni(3) is bonded in a 3-coordinate geometry to one Pr(1), one Pr(2), one P(3), and two equivalent P(2) atoms. In the fourth Ni site, Ni(4) is bonded to one Pr(1), three equivalent Pr(2), one P(2), one P(3), and two equivalent P(4) atoms to form a mixture of distorted edge and corner-sharing NiPr4P4 tetrahedra. In the fifth Ni site, Ni(5) is bonded in a 4-coordinate geometry to three equivalent Pr(2), one P(2), one P(4), and two equivalent P(3) atoms. In the sixth Ni site, Ni(6) is bonded in a 4-coordinate geometry to one Pr(2), two equivalent Pr(1), one P(1), one P(4), and two equivalent P(2) atoms. In the seventh Ni site, Ni(7) is bonded in a distorted trigonal non-coplanar geometry to one Pr(2), two equivalent Pr(1), one P(1), and two equivalent P(3) atoms. There are four inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to three equivalent Pr(1), one Ni(6), one Ni(7), two equivalent Ni(1), and two equivalent Ni(2) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Pr(2), one Ni(1), one Ni(4), one Ni(5), two equivalent Ni(3), and two equivalent Ni(6) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to two equivalent Pr(2), one Ni(2), one Ni(3), one Ni(4), two equivalent Ni(5), and two equivalent Ni(7) atoms. In the fourth P site, P(4) is bonded in a 9-coordinate geometry to two equivalent Pr(1), two equivalent Pr(2), one Ni(2), one Ni(5), one Ni(6), and two equivalent Ni(4) atoms. is represented by the CIF file [CIF]
data_Pr2Ni7P4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.773
_cell_length_b   9.263
_cell_length_c   10.478
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   366.171
_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  0.000  0.563  0.000  1.0
  Pr  Pr1  1  0.500  0.437  0.500  1.0
  Pr  Pr2  1  0.000  0.939  0.783  1.0
  Pr  Pr3  1  0.500  0.061  0.283  1.0
  Ni  Ni4  1  0.000  0.583  0.304  1.0
  Ni  Ni5  1  0.500  0.417  0.804  1.0
  Ni  Ni6  1  0.000  0.318  0.260  1.0
  Ni  Ni7  1  0.500  0.682  0.760  1.0
  Ni  Ni8  1  0.000  0.253  0.903  1.0
  Ni  Ni9  1  0.500  0.747  0.403  1.0
  Ni  Ni10  1  0.000  0.904  0.086  1.0
  Ni  Ni11  1  0.500  0.096  0.586  1.0
  Ni  Ni12  1  0.000  0.939  0.480  1.0
  Ni  Ni13  1  0.500  0.061  0.980  1.0
  Ni  Ni14  1  0.000  0.275  0.672  1.0
  Ni  Ni15  1  0.500  0.725  0.172  1.0
  Ni  Ni16  1  0.000  0.695  0.575  1.0
  Ni  Ni17  1  0.500  0.305  0.075  1.0
  P  P18  1  0.000  0.524  0.718  1.0
  P  P19  1  0.500  0.476  0.218  1.0
  P  P20  1  0.000  0.816  0.288  1.0
  P  P21  1  0.500  0.184  0.788  1.0
  P  P22  1  0.000  0.157  0.089  1.0
  P  P23  1  0.500  0.843  0.589  1.0
  P  P24  1  0.000  0.185  0.473  1.0
  P  P25  1  0.500  0.815  0.973  1.0
[/CIF]
.